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From "Duo Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-17206) FSHLog may roll a new writer successfully with unflushed entries
Date Wed, 30 Nov 2016 13:50:58 GMT

     [ https://issues.apache.org/jira/browse/HBASE-17206?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Duo Zhang updated HBASE-17206:
------------------------------
    Attachment:     (was: HBASE-17206.patch)

> FSHLog may roll a new writer successfully with unflushed entries
> ----------------------------------------------------------------
>
>                 Key: HBASE-17206
>                 URL: https://issues.apache.org/jira/browse/HBASE-17206
>             Project: HBase
>          Issue Type: Bug
>          Components: wal
>    Affects Versions: 2.0.0, 1.3.0, 1.4.0, 1.1.7, 1.2.4
>            Reporter: Duo Zhang
>            Assignee: Duo Zhang
>            Priority: Critical
>             Fix For: 2.0.0, 1.3.0, 1.4.0, 1.2.5, 1.1.8
>
>         Attachments: HBASE-17206.patch
>
>
> Found it when debugging the flakey TestFailedAppendAndSync.
> The problem is in waitSafePoint.
> {code}
>       while (true) {
>         if (this.safePointAttainedLatch.await(1, TimeUnit.MILLISECONDS)) {
>           break;
>         }
>         if (syncFuture.isThrowable()) {
>           throw new FailedSyncBeforeLogCloseException(syncFuture.getThrowable());
>         }
>       }
>       return syncFuture;
> {code}
> If we attach the safe point quick enough then we will bypass the syncFuture.isThrowable
check and will not throw FailedSyncBeforeLogCloseException.
> This may cause incosistency between memstore and wal.



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