[jira] Commented: (HBASE-2355) unsychronized logWriters map is mutated from several threads in HLog splitting

["Kannan Muthukkaruppan (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HBASE-2355?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12848399#action_12848399 ] 

Kannan Muthukkaruppan commented on HBASE-2355:
----------------------------------------------

Nice catch Todd!


> unsychronized logWriters map is mutated from several threads in HLog splitting
> ------------------------------------------------------------------------------
>
>                 Key: HBASE-2355
>                 URL: https://issues.apache.org/jira/browse/HBASE-2355
>             Project: Hadoop HBase
>          Issue Type: Bug
>          Components: master
>    Affects Versions: 0.20.3
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>            Priority: Critical
>             Fix For: 0.20.4, 0.21.0
>
>         Attachments: hbase-2355.txt
>
>
> In splitLog, the logWriters map is an unsynchronized collection, and the spawned threads mutate it. In practice I've now seen several times a situation where one of the puts into this map is lost, and a thread ends up renaming a file it's in the process of writing to, causing those edits to be lost when the log is split.

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