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From "Ted Yu (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-4862) Splitting hlog and opening region concurrently may cause data loss
Date Sat, 26 Nov 2011 07:47:42 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4862?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13157406#comment-13157406
] 

Ted Yu commented on HBASE-4862:
-------------------------------

Thanks for the quick turnaround.
{code}
+            throw new IOException("Failed rename " + wap.p + " to " + dst);
{code}
The above should read 'Failed renaming '.

For HLog.java:
{code}
+          if (p.getName().endsWith(RECOVERED_LOG_TMPFILE_SUFFIX))
+            result = false;
{code}
Please add curly braces for the above as well.
                
> Splitting hlog and opening region concurrently may cause data loss
> ------------------------------------------------------------------
>
>                 Key: HBASE-4862
>                 URL: https://issues.apache.org/jira/browse/HBASE-4862
>             Project: HBase
>          Issue Type: Bug
>    Affects Versions: 0.90.2
>            Reporter: chunhui shen
>            Assignee: chunhui shen
>            Priority: Critical
>             Fix For: 0.92.0, 0.94.0, 0.90.5
>
>         Attachments: 4862.patch, 4862.txt, hbase-4862v1 for 0.90.diff, hbase-4862v1 for
0.90.diff, hbase-4862v1 for trunk.diff, hbase-4862v1 for trunk.diff, hbase-4862v2for0.90.diff,
hbase-4862v2fortrunk.diff
>
>
> Case Description:
> 1.Split hlog thread creat writer for the file region A/recoverd.edits/123456 and is appending
log entry
> 2.Regionserver is opening region A now, and in the process replayRecoveredEditsIfAny()
,it will delete the file region A/recoverd.edits/123456 
> 3.Split hlog thread catches the io exception, and stop parse this log file 
> and if skipError = true , add it to the corrupt logs....However, data in other regions
in this log file will loss 
> 4.Or if skipError = false, it will check filesystem.Of course, the file system is ok
, and it only prints a error log, continue assigning regions. Therefore, data in other log
files will also loss!!
> The case may happen in the following:
> 1.Move region from server A to server B
> 2.kill server A and Server B
> 3.restart server A and Server B
> We could prevent this exception throuth forbiding deleting  recover.edits file 
> which is appending by split hlog thread

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