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https://issues.apache.org/jira/browse/HBASE-4387?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13103774#comment-13103774
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Jean-Daniel Cryans commented on HBASE-4387:
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HLog.syncer() syncs outside of the updateLock and has the following comment:
bq. // Done in parallel for all writer threads, thanks to HDFS-895
So we don't need to synchronize for sync'ing but we do need something when
closing the file.
> Error while syncing: DFSOutputStream is closed
> ----------------------------------------------
>
> Key: HBASE-4387
> URL: https://issues.apache.org/jira/browse/HBASE-4387
> Project: HBase
> Issue Type: Bug
> Components: wal
> Affects Versions: 0.92.0
> Reporter: Todd Lipcon
> Priority: Critical
> Fix For: 0.92.0
>
> Attachments: errors-with-context.txt
>
>
> In a billion-row load on ~25 servers, I see "error while syncing" reasonable
> often with the error "DFSOutputStream is closed" around a roll. We have some
> race where a roll at the same time as heavy inserts causes a problem.
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