Master Eligible Node didn't rejoin after ES cluster rolling restart

[GaneshJayaram97]

Elasticsearch version :

7.10.2

Plugins installed:

[]

JVM version (java -version):

openjdk 11.0.12 2021-07-20 LTS
OpenJDK Runtime Environment 18.9 (build 11.0.12+7-LTS)
OpenJDK 64-Bit Server VM 18.9 (build 11.0.12+7-LTS, mixed mode, sharing)

OS version :

Linux 3.10.0-1160.42.2.el7.x86_64 #1 SMP Tue Sep 7 14:49:57 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux

ES Cluster Topology :

5 node setup :

3 Master Eligible Nodes (Here, all the nodes are data nodes as well)
2 Data Nodes

Note :

 1. Terminologies :

          x.x.x.x refers to Old leader IP
          y.y.y.y refers to new leader IP
          a.a.a.a, b.b.b.b, c.c.c.c refers to the members in ES cluster

          Here, b.b.b.b and c.c.c.c are data nodes and c.c.c.c is unreachable


 2. Out of 5 nodes, one node is not reachable now at the time of collecting the logs and this is a data node
 3. The issue occurs only in 5 node setup and not in 3 node setup 

Description of the problem including expected versus actual behavior:

  We formed a cluster with 5 nodes and while performing a rolling restart observed that previous master node (before rolling restart) is not rejoining the cluster back again. While others have successfully rejoined the cluster

  Here the expected behaviour is all nodes should be rejoining the cluster 

Observations :

 Following are the things that were observed when the issue occurred 

 1.  Cluster tasks with source "**elected-as-master ([2] nodes joined)**" is running forever causing the other tasks for node-left and node-join to wait in the queue forever

        On a side-note, since the old leader has been disconnected and when it came online ephemeral id got changed and hence new leader node cannot connect with it with the exception "handshake failed. unexpected remote node" 

        From new ES leader Logs :

        org.elasticsearch.cluster.metadata.ProcessClusterEventTimeoutException: failed to process cluster event (auto create [myindex-2021-11-03]) within 1m
            at org.elasticsearch.cluster.service.MasterService$Batcher.lambda$onTimeout$0(MasterService.java:143) ~[elasticsearch-7.10.2.jar:7.10.2]
            at java.util.ArrayList.forEach(ArrayList.java:1541) ~[?:?]
            at org.elasticsearch.cluster.service.MasterService$Batcher.lambda$onTimeout$1(MasterService.java:142) ~[elasticsearch-7.10.2.jar:7.10.2]
            at org.elasticsearch.common.util.concurrent.ThreadContext$ContextPreservingRunnable.run(ThreadContext.java:684) ~[elasticsearch-7.10.2.jar:7.10.2]
            at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128) [?:?]
            at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628) [?:?]
            at java.lang.Thread.run(Thread.java:829) [?:?]
        [2021-11-02T13:19:35,111][WARN ][o.e.c.NodeConnectionsService] [y.y.y.y] failed to connect to {x.x.x.x}{37L59gGkQDSy_Mm4nVKq0A}{GozQ-qT_SNuDZ1PThGs0Dw}{x.x.x.x}{x.x.x.x:9300}{dimr} (tried [26725] times)
        org.elasticsearch.transport.ConnectTransportException: [x.x.x.x][x.x.x.x:9300] handshake failed. unexpected remote node {x.x.x.x}{37L59gGkQDSy_Mm4nVKq0A}{Ai6cyeSIQdKFbWTUThPyYw}{x.x.x.x}{x.x.x.x:9300}{dimr}
            at org.elasticsearch.transport.TransportService.lambda$connectionValidator$5(TransportService.java:389) ~[elasticsearch-7.10.2.jar:7.10.2]
            at org.elasticsearch.action.ActionListener$4.onResponse(ActionListener.java:157) [elasticsearch-7.10.2.jar:7.10.2]
            at org.elasticsearch.transport.TransportService$5.onResponse(TransportService.java:476) [elasticsearch-7.10.2.jar:7.10.2]
            at org.elasticsearch.transport.TransportService$5.onResponse(TransportService.java:466) [elasticsearch-7.10.2.jar:7.10.2]
            at org.elasticsearch.action.ActionListenerResponseHandler.handleResponse(ActionListenerResponseHandler.java:54) [elasticsearch-7.10.2.jar:7.10.2]
            at org.elasticsearch.transport.TransportService$ContextRestoreResponseHandler.handleResponse(TransportService.java:1171) [elasticsearch-7.10.2.jar:7.10.2]
            at org.elasticsearch.transport.InboundHandler.doHandleResponse(InboundHandler.java:253) [elasticsearch-7.10.2.jar:7.10.2]
            at org.elasticsearch.transport.InboundHandler.lambda$handleResponse$1(InboundHandler.java:247) [elasticsearch-7.10.2.jar:7.10.2]
            at org.elasticsearch.common.util.concurrent.ThreadContext$ContextPreservingRunnable.run(ThreadContext.java:684) [elasticsearch-7.10.2.jar:7.10.2]
            at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128) [?:?]
            at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628) [?:?]
            at java.lang.Thread.run(Thread.java:829) [?:?]

Note :

            The above logs are repetitive in nature and filled the ES logs

 2. The old leader which came online couldn't able to join back the cluster and keep on re-trying to re-joining

        Old leader logs :

            [2021-11-02T07:41:47,535][DEBUG][o.e.c.c.ElectionSchedulerFactory] [x.x.x.x] scheduleNextElection{gracePeriod=500ms, thisAttempt=23, maxDelayMillis=2400, delayMillis=2571, ElectionScheduler{attempt=24, ElectionSchedulerFactory{initialTimeout=100ms, backoffTime=100ms, maxTimeout=10s}}} starting election
            [2021-11-02T07:41:47,535][DEBUG][o.e.c.c.ElectionSchedulerFactory] [x.x.x.x] scheduling scheduleNextElection{gracePeriod=500ms, thisAttempt=24, maxDelayMillis=2500, delayMillis=2780, ElectionScheduler{attempt=25, ElectionSchedulerFactory{initialTimeout=100ms, backoffTime=100ms, maxTimeout=10s}}}
            [2021-11-02T07:41:47,535][DEBUG][o.e.c.c.PreVoteCollector ] [x.x.x.x] PreVotingRound{preVotesReceived={}, electionStarted=false, preVoteRequest=PreVoteRequest{sourceNode={x.x.x.x}{37L59gGkQDSy_Mm4nVKq0A}{jSDAxnsITo6vEuJ39hI5tA}{x.x.x.x}{x.x.x.x:9300}{dimr}, currentTerm=23}, isClosed=false} requesting pre-votes from [{x.x.x.x}{37L59gGkQDSy_Mm4nVKq0A}{jSDAxnsITo6vEuJ39hI5tA}{x.x.x.x}{x.x.x.x:9300}{dimr}, {a.a.a.a}{tb0FsGKdS8GVGanjyLx5fg}{32KWdVyQSw-g0DvJQ5mnrg}{a.a.a.a}{a.a.a.a:9300}{dimr}, {y.y.y.y}{oI2zxdVtSM-DRhQZL0jqRw}{S7_kyKpoRwWVW6OEf4wChg}{y.y.y.y}{y.y.y.y:9300}{dimr}]
            [2021-11-02T07:41:47,539][DEBUG][o.e.c.c.PreVoteCollector ] [x.x.x.x] TransportResponseHandler{PreVoteCollector{state=Tuple [v1=null, v2=PreVoteResponse{currentTerm=23, lastAcceptedTerm=22, lastAcceptedVersion=3662}]}, node={a.a.a.a}{tb0FsGKdS8GVGanjyLx5fg}{32KWdVyQSw-g0DvJQ5mnrg}{a.a.a.a}{a.a.a.a:9300}{dimr}} failed
            org.elasticsearch.transport.RemoteTransportException: [a.a.a.a][a.a.a.a:9300][internal:cluster/request_pre_vote]
            Caused by: org.elasticsearch.cluster.coordination.CoordinationStateRejectedException: rejecting PreVoteRequest{sourceNode={x.x.x.x}{37L59gGkQDSy_Mm4nVKq0A}{jSDAxnsITo6vEuJ39hI5tA}{x.x.x.x}{x.x.x.x:9300}{dimr}, currentTerm=23} as there is already a leader
                at org.elasticsearch.cluster.coordination.PreVoteCollector.handlePreVoteRequest(PreVoteCollector.java:135) ~[elasticsearch-7.10.2.jar:7.10.2]
                at org.elasticsearch.cluster.coordination.PreVoteCollector.lambda$new$0(PreVoteCollector.java:74) ~[elasticsearch-7.10.2.jar:7.10.2]
                at com.amazon.opendistro.elasticsearch.performanceanalyzer.transport.PerformanceAnalyzerTransportRequestHandler.messageReceived(PerformanceAnalyzerTransportRequestHandler.java:49) ~[?:?]
                at com.amazon.opendistroforelasticsearch.indexmanagement.rollup.interceptor.RollupInterceptor$interceptHandler$1.messageReceived(RollupInterceptor.kt:124) ~[?:?]
                at org.elasticsearch.transport.RequestHandlerRegistry.processMessageReceived(RequestHandlerRegistry.java:72) ~[elasticsearch-7.10.2.jar:7.10.2]
                at org.elasticsearch.transport.InboundHandler$RequestHandler.doRun(InboundHandler.java:305) ~[elasticsearch-7.10.2.jar:7.10.2]
                at org.elasticsearch.common.util.concurrent.ThreadContext$ContextPreservingAbstractRunnable.doRun(ThreadContext.java:743) ~[elasticsearch-7.10.2.jar:7.10.2]
                at org.elasticsearch.common.util.concurrent.AbstractRunnable.run(AbstractRunnable.java:37) ~[elasticsearch-7.10.2.jar:7.10.2]
                at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128) [?:?]
                at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628) [?:?]
                at java.lang.Thread.run(Thread.java:829) [?:?]
            [2021-11-02T07:41:47,542][DEBUG][o.e.c.c.PreVoteCollector ] [x.x.x.x] PreVotingRound{preVotesReceived={{x.x.x.x}{37L59gGkQDSy_Mm4nVKq0A}{jSDAxnsITo6vEuJ39hI5tA}{x.x.x.x}{x.x.x.x:9300}{dimr}=PreVoteResponse{currentTerm=23, lastAcceptedTerm=22, lastAcceptedVersion=3662}}, electionStarted=false, preVoteRequest=PreVoteRequest{sourceNode={x.x.x.x}{37L59gGkQDSy_Mm4nVKq0A}{jSDAxnsITo6vEuJ39hI5tA}{x.x.x.x}{x.x.x.x:9300}{dimr}, currentTerm=23}, isClosed=false} added PreVoteResponse{currentTerm=23, lastAcceptedTerm=22, lastAcceptedVersion=3662} from {x.x.x.x}{37L59gGkQDSy_Mm4nVKq0A}{jSDAxnsITo6vEuJ39hI5tA}{x.x.x.x}{x.x.x.x:9300}{dimr}, no quorum yet
            [2021-11-02T07:41:47,541][DEBUG][o.e.c.c.PreVoteCollector ] [x.x.x.x] TransportResponseHandler{PreVoteCollector{state=Tuple [v1=null, v2=PreVoteResponse{currentTerm=23, lastAcceptedTerm=22, lastAcceptedVersion=3662}]}, node={y.y.y.y}{oI2zxdVtSM-DRhQZL0jqRw}{S7_kyKpoRwWVW6OEf4wChg}{y.y.y.y}{y.y.y.y:9300}{dimr}} failed
            org.elasticsearch.transport.RemoteTransportException: [y.y.y.y][y.y.y.y:9300][internal:cluster/request_pre_vote]
            Caused by: org.elasticsearch.cluster.coordination.CoordinationStateRejectedException: rejecting PreVoteRequest{sourceNode={x.x.x.x}{37L59gGkQDSy_Mm4nVKq0A}{jSDAxnsITo6vEuJ39hI5tA}{x.x.x.x}{x.x.x.x:9300}{dimr}, currentTerm=23} as there is already a leader
                at org.elasticsearch.cluster.coordination.PreVoteCollector.handlePreVoteRequest(PreVoteCollector.java:135) ~[elasticsearch-7.10.2.jar:7.10.2]
                at org.elasticsearch.cluster.coordination.PreVoteCollector.lambda$new$0(PreVoteCollector.java:74) ~[elasticsearch-7.10.2.jar:7.10.2]
                at com.amazon.opendistro.elasticsearch.performanceanalyzer.transport.PerformanceAnalyzerTransportRequestHandler.messageReceived(PerformanceAnalyzerTransportRequestHandler.java:49) ~[?:?]
                at com.amazon.opendistroforelasticsearch.indexmanagement.rollup.interceptor.RollupInterceptor$interceptHandler$1.messageReceived(RollupInterceptor.kt:124) ~[?:?]
                at org.elasticsearch.transport.RequestHandlerRegistry.processMessageReceived(RequestHandlerRegistry.java:72) ~[elasticsearch-7.10.2.jar:7.10.2]
                at org.elasticsearch.transport.InboundHandler$RequestHandler.doRun(InboundHandler.java:305) ~[elasticsearch-7.10.2.jar:7.10.2]
                at org.elasticsearch.common.util.concurrent.ThreadContext$ContextPreservingAbstractRunnable.doRun(ThreadContext.java:743) ~[elasticsearch-7.10.2.jar:7.10.2]
                at org.elasticsearch.common.util.concurrent.AbstractRunnable.run(AbstractRunnable.java:37) ~[elasticsearch-7.10.2.jar:7.10.2]
                at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128) [?:?]
                at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628) [?:?]
                at java.lang.Thread.run(Thread.java:829) [?:?]
            
            
            
            [2021-11-02T07:41:48,126][DEBUG][o.e.c.c.JoinHelper       ] [x.x.x.x] already attempting to join {y.y.y.y}{oI2zxdVtSM-DRhQZL0jqRw}{S7_kyKpoRwWVW6OEf4wChg}{y.y.y.y}{y.y.y.y:9300}{dimr} with request JoinRequest{sourceNode={x.x.x.x}{37L59gGkQDSy_Mm4nVKq0A}{jSDAxnsITo6vEuJ39hI5tA}{x.x.x.x}{x.x.x.x:9300}{dimr}, minimumTerm=23, optionalJoin=Optional.empty}, not sending request
            [2021-11-02T07:41:48,126][DEBUG][o.e.d.PeerFinder         ] [x.x.x.x] Peer{transportAddress=c.c.c.c:9300, discoveryNode=null, peersRequestInFlight=false} connection failed
            org.elasticsearch.transport.ConnectTransportException: [][c.c.c.c:9300] connect_timeout[3s]
                at org.elasticsearch.transport.TcpTransport$ChannelsConnectedListener.onTimeout(TcpTransport.java:984) ~[elasticsearch-7.10.2.jar:7.10.2]
                at org.elasticsearch.common.util.concurrent.ThreadContext$ContextPreservingRunnable.run(ThreadContext.java:684) ~[elasticsearch-7.10.2.jar:7.10.2]
                at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128) [?:?]
                at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628) [?:?]
                at java.lang.Thread.run(Thread.java:829) [?:?]
            [2021-11-02T07:41:48,130][DEBUG][o.e.d.PeerFinder         ] [x.x.x.x] Peer{transportAddress=b.b.b.b:9300, discoveryNode=null, peersRequestInFlight=false} connection failed
            org.elasticsearch.transport.ConnectTransportException: [b.b.b.b][b.b.b.b:9300] non-master-eligible node found
                at org.elasticsearch.discovery.HandshakingTransportAddressConnector$1$1$1.innerOnResponse(HandshakingTransportAddressConnector.java:107) [elasticsearch-7.10.2.jar:7.10.2]
                at org.elasticsearch.discovery.HandshakingTransportAddressConnector$1$1$1.innerOnResponse(HandshakingTransportAddressConnector.java:95) [elasticsearch-7.10.2.jar:7.10.2]
                at org.elasticsearch.action.NotifyOnceListener.onResponse(NotifyOnceListener.java:40) [elasticsearch-7.10.2.jar:7.10.2]
                at org.elasticsearch.action.ActionListener$4.onResponse(ActionListener.java:163) [elasticsearch-7.10.2.jar:7.10.2]
                at org.elasticsearch.transport.TransportService$5.onResponse(TransportService.java:476) [elasticsearch-7.10.2.jar:7.10.2]
                at org.elasticsearch.transport.TransportService$5.onResponse(TransportService.java:466) [elasticsearch-7.10.2.jar:7.10.2]
                at org.elasticsearch.action.ActionListenerResponseHandler.handleResponse(ActionListenerResponseHandler.java:54) [elasticsearch-7.10.2.jar:7.10.2]
                at org.elasticsearch.transport.TransportService$ContextRestoreResponseHandler.handleResponse(TransportService.java:1171) [elasticsearch-7.10.2.jar:7.10.2]
                at org.elasticsearch.transport.InboundHandler.doHandleResponse(InboundHandler.java:253) [elasticsearch-7.10.2.jar:7.10.2]
                at org.elasticsearch.transport.InboundHandler.lambda$handleResponse$1(InboundHandler.java:247) [elasticsearch-7.10.2.jar:7.10.2]
                at org.elasticsearch.common.util.concurrent.ThreadContext$ContextPreservingRunnable.run(ThreadContext.java:684) [elasticsearch-7.10.2.jar:7.10.2]
                at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128) [?:?]
                at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628) [?:?]
                at java.lang.Thread.run(Thread.java:829) [?:?]
            
            [2021-11-02T07:41:49,087][WARN ][o.e.c.c.ClusterFormationFailureHelper] [x.x.x.x] master not discovered or elected yet, an election requires at least 2 nodes with ids from [tb0FsGKdS8GVGanjyLx5fg, 37L59gGkQDSy_Mm4nVKq0A, oI2zxdVtSM-DRhQZL0jqRw], have discovered [{x.x.x.x}{37L59gGkQDSy_Mm4nVKq0A}{jSDAxnsITo6vEuJ39hI5tA}{x.x.x.x}{x.x.x.x:9300}{dimr}, {a.a.a.a}{tb0FsGKdS8GVGanjyLx5fg}{32KWdVyQSw-g0DvJQ5mnrg}{a.a.a.a}{a.a.a.a:9300}{dimr}, {y.y.y.y}{oI2zxdVtSM-DRhQZL0jqRw}{S7_kyKpoRwWVW6OEf4wChg}{y.y.y.y}{y.y.y.y:9300}{dimr}] which is a quorum; discovery will continue using [b.b.b.b:9300, a.a.a.a:9300, y.y.y.y:9300, c.c.c.c:9300] from hosts providers and [{x.x.x.x}{37L59gGkQDSy_Mm4nVKq0A}{jSDAxnsITo6vEuJ39hI5tA}{x.x.x.x}{x.x.x.x:9300}{dimr}] from last-known cluster state; node term 23, last-accepted version 3662 in term 22
            [2021-11-02T07:41:49,101][WARN ][o.e.n.Node               ] [x.x.x.x] timed out while waiting for initial discovery state - timeout: 30s

 3. Cluster health is green and below is the output 
          
         curl -XGET "localhost:9200/_cluster/health?pretty"
                {
                "cluster_name" : "elasticsearch",
                "status" : "green",
                "timed_out" : false,
                "number_of_nodes" : 4,
                "number_of_data_nodes" : 4,
                "active_primary_shards" : 43,
                "active_shards" : 122,
                "relocating_shards" : 0,
                "initializing_shards" : 0,
                "unassigned_shards" : 0,
                "delayed_unassigned_shards" : 0,
                "number_of_pending_tasks" : 149,
                "number_of_in_flight_fetch" : 0,
                "task_max_waiting_in_queue_millis" : 271277743,
                "active_shards_percent_as_number" : 100.0
                }

 4. Output of cluster state from new leader node which has old ephemeral id of the old leader node
         
         curl -XGET "localhost:9200/_cluster/state?filter_path=version,nodes,metadata.cluster_coordination&pretty"
                {
                    "version": 3663,
                    "nodes": {
                    "tb0FsGKdS8GVGanjyLx5fg": {
                        "name": "a.a.a.a",
                        "ephemeral_id": "32KWdVyQSw-g0DvJQ5mnrg",
                        "transport_address": "a.a.a.a:9300",
                        "attributes": {}
                    },
                    "37L59gGkQDSy_Mm4nVKq0A": {
                        "name": "x.x.x.x",
                        "ephemeral_id": "GozQ-qT_SNuDZ1PThGs0Dw",
                        "transport_address": "x.x.x.x:9300",
                        "attributes": {}
                    },
                    "3vhpqpzqQ4WooDM07CWmaQ": {
                        "name": "b.b.b.b",
                        "ephemeral_id": "mU6REJeJTCSNuXcigNQHmg",
                        "transport_address": "b.b.b.b:9300",
                        "attributes": {}
                    },
                    "oI2zxdVtSM-DRhQZL0jqRw": {
                        "name": "y.y.y.y",
                        "ephemeral_id": "S7_kyKpoRwWVW6OEf4wChg",
                        "transport_address": "y.y.y.y.:9300",
                        "attributes": {}
                    }
                    },
                    "metadata": {
                    "cluster_coordination": {
                        "term": 23,
                        "last_committed_config": [
                        "tb0FsGKdS8GVGanjyLx5fg",
                        "oI2zxdVtSM-DRhQZL0jqRw",
                        "37L59gGkQDSy_Mm4nVKq0A"
                        ],
                        "last_accepted_config": [
                        "tb0FsGKdS8GVGanjyLx5fg",
                        "oI2zxdVtSM-DRhQZL0jqRw",
                        "37L59gGkQDSy_Mm4nVKq0A"
                        ],
                        "voting_config_exclusions": []
                    }
                    }
                } 

 5. Cluster tasks keep on growing over period of time
   
        Output of GET /_cluster/pending_tasks from newly elected leader node

            {
                "tasks": [
                    {
                    "insert_order": 1,
                    "priority": "URGENT",
                    "source": "elected-as-master ([2] nodes joined)",
                    "executing": true,
                    "time_in_queue_millis": 264617841,
                    "time_in_queue": "3d"
                    },
                    {
                    "insert_order": 3,
                    "priority": "IMMEDIATE",
                    "source": "node-left",
                    "executing": false,
                    "time_in_queue_millis": 264617803,
                    "time_in_queue": "3d"
                    },
                    {
                    "insert_order": 6,
                    "priority": "URGENT",
                    "source": "node-join",
                    "executing": false,
                    "time_in_queue_millis": 264529931,
                    "time_in_queue": "3d"
                    },
                    {
                    "insert_order": 1871,
                    "priority": "URGENT",
                    "source": "node-join",
                    "executing": false,
                    "time_in_queue_millis": 178425300,
                    "time_in_queue": "2d"
                    },
                    {
                    "insert_order": 9324,
                    "priority": "URGENT",
                    "source": "node-join",
                    "executing": false,
                    "time_in_queue_millis": 17498238,
                    "time_in_queue": "4.8h"
                    },
                    {
                    "insert_order": 970,
                    "priority": "URGENT",
                    "source": "node-join",
                    "executing": false,
                    "time_in_queue_millis": 197779438,
                    "time_in_queue": "2.2d"
                    },
                    {
                    "insert_order": 7,
                    "priority": "HIGH",
                    "source": "shard-failed",
                    "executing": false,
                    "time_in_queue_millis": 264523252,
                    "time_in_queue": "3d"
                    },
                    {
                    "insert_order": 8,
                    "priority": "HIGH",
                    "source": "shard-failed",
                    "executing": false,
                    "time_in_queue_millis": 264522485,
                    "time_in_queue": "3d"
                    },
                    {
                    "insert_order": 9328,
                    "priority": "URGENT",
                    "source": "node-join",
                    "executing": false,
                    "time_in_queue_millis": 17431702,
                    "time_in_queue": "4.8h"
                    },
                    {
                    "insert_order": 9426,
                    "priority": "URGENT",
                    "source": "node-join",
                    "executing": false,
                    "time_in_queue_millis": 15536579,
                    "time_in_queue": "4.3h"
                    },
                    {
                    "insert_order": 5062,
                    "priority": "URGENT",
                    "source": "node-join",
                    "executing": false,
                    "time_in_queue_millis": 109487418,
                    "time_in_queue": "1.2d"
                    },
                    {
                    "insert_order": 5364,
                    "priority": "URGENT",
                    "source": "node-join",
                    "executing": false,
                    "time_in_queue_millis": 102934485,
                    "time_in_queue": "1.1d"
                    },
                    {
                    "insert_order": 4,
                    "priority": "NORMAL",
                    "source": "update snapshot after shards started [false] or node configuration changed [true]",
                    "executing": false,
                    "time_in_queue_millis": 264617719,
                    "time_in_queue": "3d"
                    },
                    {
                    "insert_order": 5,
                    "priority": "NORMAL",
                    "source": "rollover_index source [.opendistro-ism-managed-index-history-2021.10.29-000008] to target [.opendistro-ism-managed-index-history-2021.10.30-000009]",
                    "executing": false,
                    "time_in_queue_millis": 264617680,
                    "time_in_queue": "3d"
                    },
                    {
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                    "time_in_queue_millis": 73255201,
                    "time_in_queue": "20.3h"
                    },
                    {
                    "insert_order": 6746,
                    "priority": "NORMAL",
                    "source": "opendistro-im",
                    "executing": false,
                    "time_in_queue_millis": 73254209,
                    "time_in_queue": "20.3h"
                    },
                    {
                    "insert_order": 2374,
                    "priority": "NORMAL",
                    "source": "opendistro-im",
                    "executing": false,
                    "time_in_queue_millis": 167492468,
                    "time_in_queue": "1.9d"
                    },
                    {
                    "insert_order": 7768,
                    "priority": "NORMAL",
                    "source": "opendistro-im",
                    "executing": false,
                    "time_in_queue_millis": 51115174,
                    "time_in_queue": "14.1h"
                    },
                    {
                    "insert_order": 7712,
                    "priority": "NORMAL",
                    "source": "opendistro-im",
                    "executing": false,
                    "time_in_queue_millis": 52292472,
                    "time_in_queue": "14.5h"
                    },
                    {
                    "insert_order": 7790,
                    "priority": "NORMAL",
                    "source": "opendistro-im",
                    "executing": false,
                    "time_in_queue_millis": 50614991,
                    "time_in_queue": "14h"
                    },
                    {
                    "insert_order": 8080,
                    "priority": "NORMAL",
                    "source": "opendistro-im",
                    "executing": false,
                    "time_in_queue_millis": 44454209,
                    "time_in_queue": "12.3h"
                    },
                    {
                    "insert_order": 2702,
                    "priority": "NORMAL",
                    "source": "opendistro-im",
                    "executing": false,
                    "time_in_queue_millis": 160371481,
                    "time_in_queue": "1.8d"
                    },
                    {
                    "insert_order": 8043,
                    "priority": "NORMAL",
                    "source": "opendistro-im",
                    "executing": false,
                    "time_in_queue_millis": 45169599,
                    "time_in_queue": "12.5h"
                    },
                    {
                    "insert_order": 8040,
                    "priority": "NORMAL",
                    "source": "opendistro-im",
                    "executing": false,
                    "time_in_queue_millis": 45171483,
                    "time_in_queue": "12.5h"
                    },
                    {
                    "insert_order": 8041,
                    "priority": "NORMAL",
                    "source": "opendistro-im",
                    "executing": false,
                    "time_in_queue_millis": 45171351,
                    "time_in_queue": "12.5h"
                    },
                    {
                    "insert_order": 8081,
                    "priority": "NORMAL",
                    "source": "opendistro-im",
                    "executing": false,
                    "time_in_queue_millis": 44453470,
                    "time_in_queue": "12.3h"
                    },
                    {
                    "insert_order": 8082,
                    "priority": "NORMAL",
                    "source": "opendistro-im",
                    "executing": false,
                    "time_in_queue_millis": 44453233,
                    "time_in_queue": "12.3h"
                    },
                    {
                    "insert_order": 8078,
                    "priority": "NORMAL",
                    "source": "opendistro-im",
                    "executing": false,
                    "time_in_queue_millis": 44456213,
                    "time_in_queue": "12.3h"
                    },
                    {
                    "insert_order": 8079,
                    "priority": "NORMAL",
                    "source": "opendistro-im",
                    "executing": false,
                    "time_in_queue_millis": 44455201,
                    "time_in_queue": "12.3h"
                    },
                    {
                    "insert_order": 8888,
                    "priority": "NORMAL",
                    "source": "opendistro-im",
                    "executing": false,
                    "time_in_queue_millis": 26907030,
                    "time_in_queue": "7.4h"
                    },
                    {
                    "insert_order": 2704,
                    "priority": "NORMAL",
                    "source": "opendistro-im",
                    "executing": false,
                    "time_in_queue_millis": 160369596,
                    "time_in_queue": "1.8d"
                    },
                    {
                    "insert_order": 2744,
                    "priority": "NORMAL",
                    "source": "opendistro-im",
                    "executing": false,
                    "time_in_queue_millis": 159653231,
                    "time_in_queue": "1.8d"
                    },
                    {
                    "insert_order": 8922,
                    "priority": "NORMAL",
                    "source": "opendistro-im",
                    "executing": false,
                    "time_in_queue_millis": 26159456,
                    "time_in_queue": "7.2h"
                    },
                    {
                    "insert_order": 9124,
                    "priority": "NORMAL",
                    "source": "opendistro-im",
                    "executing": false,
                    "time_in_queue_millis": 21814992,
                    "time_in_queue": "6h"
                    },
                    {
                    "insert_order": 9046,
                    "priority": "NORMAL",
                    "source": "opendistro-im",
                    "executing": false,
                    "time_in_queue_millis": 23492466,
                    "time_in_queue": "6.5h"
                    },
                    {
                    "insert_order": 9102,
                    "priority": "NORMAL",
                    "source": "opendistro-im",
                    "executing": false,
                    "time_in_queue_millis": 22315179,
                    "time_in_queue": "6.1h"
                    },
                    {
                    "insert_order": 2742,
                    "priority": "NORMAL",
                    "source": "opendistro-im",
                    "executing": false,
                    "time_in_queue_millis": 159654209,
                    "time_in_queue": "1.8d"
                    },
                    {
                    "insert_order": 3550,
                    "priority": "NORMAL",
                    "source": "opendistro-im",
                    "executing": false,
                    "time_in_queue_millis": 142107026,
                    "time_in_queue": "1.6d"
                    },
                    {
                    "insert_order": 9379,
                    "priority": "NORMAL",
                    "source": "opendistro-im",
                    "executing": false,
                    "time_in_queue_millis": 16369599,
                    "time_in_queue": "4.5h"
                    },
                    {
                    "insert_order": 9376,
                    "priority": "NORMAL",
                    "source": "opendistro-im",
                    "executing": false,
                    "time_in_queue_millis": 16371477,
                    "time_in_queue": "4.5h"
                    },
                    {
                    "insert_order": 9377,
                    "priority": "NORMAL",
                    "source": "opendistro-im",
                    "executing": false,
                    "time_in_queue_millis": 16371352,
                    "time_in_queue": "4.5h"
                    },
                    {
                    "insert_order": 9378,
                    "priority": "NORMAL",
                    "source": "opendistro-im",
                    "executing": false,
                    "time_in_queue_millis": 16369599,
                    "time_in_queue": "4.5h"
                    },
                    {
                    "insert_order": 3708,
                    "priority": "NORMAL",
                    "source": "opendistro-im",
                    "executing": false,
                    "time_in_queue_millis": 138692467,
                    "time_in_queue": "1.6d"
                    },
                    {
                    "insert_order": 9419,
                    "priority": "NORMAL",
                    "source": "opendistro-im",
                    "executing": false,
                    "time_in_queue_millis": 15653228,
                    "time_in_queue": "4.3h"
                    },
                    {
                    "insert_order": 9415,
                    "priority": "NORMAL",
                    "source": "opendistro-im",
                    "executing": false,
                    "time_in_queue_millis": 15656216,
                    "time_in_queue": "4.3h"
                    },
                    {
                    "insert_order": 9416,
                    "priority": "NORMAL",
                    "source": "opendistro-im",
                    "executing": false,
                    "time_in_queue_millis": 15655196,
                    "time_in_queue": "4.3h"
                    },
                    {
                    "insert_order": 9417,
                    "priority": "NORMAL",
                    "source": "opendistro-im",
                    "executing": false,
                    "time_in_queue_millis": 15654209,
                    "time_in_queue": "4.3h"
                    },
                    {
                    "insert_order": 9418,
                    "priority": "NORMAL",
                    "source": "opendistro-im",
                    "executing": false,
                    "time_in_queue_millis": 15653465,
                    "time_in_queue": "4.3h"
                    },
                    {
                    "insert_order": 3786,
                    "priority": "NORMAL",
                    "source": "opendistro-im",
                    "executing": false,
                    "time_in_queue_millis": 137014990,
                    "time_in_queue": "1.5d"
                    },
                    {
                    "insert_order": 4038,
                    "priority": "NORMAL",
                    "source": "opendistro-im",
                    "executing": false,
                    "time_in_queue_millis": 131569598,
                    "time_in_queue": "1.5d"
                    }
                ]
            }


 6. Thread Pool Info 
       
        curl -X GET "localhost:9200/_cat/thread_pool?pretty"
        a.a.a.a  ad-batch-task-threadpool               0 0 0
        a.a.a.a  ad-threadpool                          0 0 0
        a.a.a.a  analyze                                0 0 0
        a.a.a.a  fetch_shard_started                    0 0 0
        a.a.a.a  fetch_shard_store                      0 0 0
        a.a.a.a  flush                                  0 0 0
        a.a.a.a  force_merge                            0 0 0
        a.a.a.a  generic                                0 0 0
        a.a.a.a  get                                    0 0 0
        a.a.a.a  listener                               0 0 0
        a.a.a.a  management                             1 0 0
        a.a.a.a  open_distro_job_scheduler              0 0 0
        a.a.a.a  opendistro_asynchronous_search_generic 0 0 0
        a.a.a.a  refresh                                0 0 0
        a.a.a.a  search                                 0 0 0
        a.a.a.a  search_throttled                       0 0 0
        a.a.a.a  snapshot                               0 0 0
        a.a.a.a  sql-worker                             0 0 0
        a.a.a.a  system_read                            0 0 0
        a.a.a.a  system_write                           0 0 0
        a.a.a.a  warmer                                 0 0 0
        a.a.a.a  write                                  0 0 0
        b.b.b.b ad-batch-task-threadpool               0 0 0
        b.b.b.b ad-threadpool                          0 0 0
        b.b.b.b analyze                                0 0 0
        b.b.b.b fetch_shard_started                    0 0 0
        b.b.b.b fetch_shard_store                      0 0 0
        b.b.b.b flush                                  0 0 0
        b.b.b.b force_merge                            0 0 0
        b.b.b.b generic                                0 0 0
        b.b.b.b get                                    0 0 0
        b.b.b.b listener                               0 0 0
        b.b.b.b management                             1 0 0
        b.b.b.b open_distro_job_scheduler              0 0 0
        b.b.b.b opendistro_asynchronous_search_generic 0 0 0
        b.b.b.b refresh                                0 0 0
        b.b.b.b search                                 0 0 0
        b.b.b.b search_throttled                       0 0 0
        b.b.b.b snapshot                               0 0 0
        b.b.b.b sql-worker                             0 0 0
        b.b.b.b system_read                            0 0 0
        b.b.b.b system_write                           0 0 0
        b.b.b.b warmer                                 0 0 0
        b.b.b.b write                                  0 0 0
        y.y.y.y  ad-batch-task-threadpool               0 0 0
        y.y.y.y  ad-threadpool                          0 0 0
        y.y.y.y  analyze                                0 0 0
        y.y.y.y  fetch_shard_started                    0 0 0
        y.y.y.y  fetch_shard_store                      0 0 0
        y.y.y.y  flush                                  0 0 0
        y.y.y.y  force_merge                            0 0 0
        y.y.y.y  generic                                0 0 0
        y.y.y.y  get                                    0 0 0
        y.y.y.y  listener                               0 0 0
        y.y.y.y  management                             1 0 0
        y.y.y.y  open_distro_job_scheduler              0 0 0
        y.y.y.y  opendistro_asynchronous_search_generic 0 0 0
        y.y.y.y  refresh                                0 0 0
        y.y.y.y  search                                 0 0 0
        y.y.y.y  search_throttled                       0 0 0
        y.y.y.y  snapshot                               0 0 0
        y.y.y.y  sql-worker                             0 0 0
        y.y.y.y  system_read                            0 0 0
        y.y.y.y  system_write                           0 0 0
        y.y.y.y  warmer                                 0 0 0
        y.y.y.y  write                                  0 0 0

Workaround suggested :

Full restart of ES cluster

Links Referred before raising this issue :

  https://discuss.opendistrocommunity.dev/t/killed-active-master-not-being-removed-from-the-cluster-state/5011
  https://github.com/elastic/elasticsearch/issues/56979

Steps to reproduce:

Currently there is no specific reproducing steps to simulate the node rejoin failure but it is occurring one or the other times when rolling restarts were performed

[DaveCTurner]

This certainly looks like a bug but I don't think this is the right place to report it. You're using the OpenDistro fork of Elasticsearch which is quite separate from the codebase tracked in this repository, and you should report issues to the maintainers of your fork instead. Therefore I am closing this.

If you can reproduce this with Elasticsearch proper then we'd love to hear about it, and ask that you capture a heap dump and thread dump from the master before restarting anything next time. Either append them (at least the thread dump) to this issue and we'll reopen it, or else open another issue.

[GaneshJayaram97]

Hi @DaveCTurner,

Raised a new issue under opensearch as opendistro has been deprecated in favour of opensearch.
ES cluster rejoin Issue

Fortunately the issue is now reproducible but unfortunately i didn't try it in pure elasticsearch

As you mentioned, will capture the thread/heap dump and attach it in the new ticket