servers stop serving when lower 32bits of zxid roll over
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Key: ZOOKEEPER-1277
URL: https://issues.apache.org/jira/browse/ZOOKEEPER-1277
Project: ZooKeeper
Issue Type: Bug
Components: server
Affects Versions: 3.3.3
Reporter: Patrick Hunt
Assignee: Patrick Hunt
Priority: Blocker
Fix For: 3.3.4
When the lower 32bits of a zxid "roll over" (zxid is a 64 bit number, however
the upper 32 are considered the epoch number) the epoch number (upper 32 bits)
are incremented and the lower 32 start at 0 again.
This should work fine, however in the current 3.3 branch the followers see this
as a NEWLEADER message, which it's not, and effectively stop serving clients.
Attached clients seem to eventually time out given that heartbeats (or any
operation) are no longer processed. The follower doesn't recover from this.
I've tested this out on 3.3 branch and confirmed this problem, however I
haven't tried it on 3.4/3.5. It may not happen on the newer branches due to
ZOOKEEPER-335, however there is certainly an issue with updating the
"acceptedEpoch" files contained in the datadir. (I'll enter a separate jira for
that)
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