[Zen2] Introduce FollowersChecker #33917
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It is important that the leader periodically checks that its followers are still healthy and can remain part of its cluster. If these checks fail repeatedly then the leader should remove the faulty node from the cluster. The FollowerChecker, introduced in this commit, performs these periodic checks and deals with retries.
DaveCTurner
added
>enhancement
v7.0.0
:Distributed Coordination/Cluster Coordination
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Pinging @elastic/es-distributed |
ywelsch
reviewed
Sep 21, 2018
server/src/main/java/org/elasticsearch/cluster/coordination/FollowersChecker.java
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server/src/main/java/org/elasticsearch/cluster/coordination/FollowersChecker.java
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| request, this).getFormattedMessage()); | ||
| } | ||
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| executeRunnable.accept(new AbstractRunnable() { |
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can you add assert request.term > this.term before this line?
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That doesn't hold - we could be in the correct term but a CANDIDATE (e.g. LeaderChecker thinks the leader failed) and then we need to call into the coordinator and become a FOLLOWER again.
server/src/main/java/org/elasticsearch/cluster/coordination/FollowersChecker.java
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server/src/main/java/org/elasticsearch/cluster/coordination/FollowersChecker.java
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server/src/main/java/org/elasticsearch/cluster/coordination/FollowersChecker.java
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server/src/main/java/org/elasticsearch/cluster/coordination/FollowersChecker.java
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server/src/main/java/org/elasticsearch/cluster/coordination/FollowersChecker.java
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server/src/test/java/org/elasticsearch/cluster/coordination/FollowersCheckerTests.java
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server/src/main/java/org/elasticsearch/cluster/coordination/FollowersChecker.java
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@elasticmachine test this please |
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ywelsch
added a commit
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Sep 28, 2018
Allows this class to be cleanly shared between Zen1 and Zen2. Follow-up to #33917
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It is important that the leader periodically checks that its followers are
still healthy and can remain part of its cluster. If these checks fail
repeatedly then the leader should remove the faulty node from the cluster. The
FollowerChecker, introduced in this commit, performs these periodic checks and
deals with retries.