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https://issues.apache.org/jira/browse/ZOOKEEPER-1264?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13142211#comment-13142211
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Camille Fournier commented on ZOOKEEPER-1264:
---------------------------------------------
Because when the follower writes a new log file without writing a snapshot with
the old transactions, on restart the ZK thinks it has the transactions up to
the zxid in the log file. The fact that these transactions were never written
to a log or snapshot by the follower is not captured. We got a NEWLEADER and
took a snapshot, then got a bunch of txns that went directly to our data tree,
then got UPTODATE, then some other new transactions that caused the creation of
a brand new log file. The intermediate transactions between NEWLEADER and
UPTODATE are never written to a persistent store on the follower unless it
manages to stay alive long enough to do another snapshot.
> FollowerResyncConcurrencyTest failing intermittently
> ----------------------------------------------------
>
> Key: ZOOKEEPER-1264
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-1264
> Project: ZooKeeper
> Issue Type: Bug
> Components: tests
> Affects Versions: 3.3.3, 3.4.0, 3.5.0
> Reporter: Patrick Hunt
> Assignee: Camille Fournier
> Priority: Blocker
> Fix For: 3.3.4, 3.4.0, 3.5.0
>
> Attachments: ZOOKEEPER-1264.patch, ZOOKEEPER-1264.patch,
> ZOOKEEPER-1264_branch33.patch, ZOOKEEPER-1264_branch34.patch,
> ZOOKEEPER-1264unittest.patch, ZOOKEEPER-1264unittest.patch,
> followerresyncfailure_log.txt.gz, logs.zip, tmp.zip
>
>
> The FollowerResyncConcurrencyTest test is failing intermittently.
> saw the following on 3.4:
> {noformat}
> junit.framework.AssertionFailedError: Should have same number of
> ephemerals in both followers expected:<11741> but was:<14001>
> at
> org.apache.zookeeper.test.FollowerResyncConcurrencyTest.verifyState(FollowerResyncConcurrencyTest.java:400)
> at
> org.apache.zookeeper.test.FollowerResyncConcurrencyTest.testResyncBySnapThenDiffAfterFollowerCrashes(FollowerResyncConcurrencyTest.java:196)
> at
> org.apache.zookeeper.JUnit4ZKTestRunner$LoggedInvokeMethod.evaluate(JUnit4ZKTestRunner.java:52)
> {noformat}
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