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From "Jean-Daniel Cryans (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-5782) Not all the regions are getting assigned after the log splitting.
Date Mon, 16 Apr 2012 22:32:17 GMT

    [ https://issues.apache.org/jira/browse/HBASE-5782?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13255130#comment-13255130
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Jean-Daniel Cryans commented on HBASE-5782:
-------------------------------------------

bq. Don't hate me, just throwing this out there.

LOL

My current concerns:

 - Performance, and I'm not the only one concerned.
 - OOME, what happens if you enable deferred log flush and HDFS is slowing down? That's actually
an issue with HBASE-4487 since the {{LinkedList}} of pending writes is unbounded whereas before
simply appending to the file would slow you down.
 - This patch will make it that threads can sync data from threads that came in later. You
need to check {{txid <= this.syncedTillHere}} again once you are past the {{synchronized(syncLock)}}
and return if it was taken care of while you were blocking.
 - Deadlocks, you never know when adding new locks :)
                
> Not all the regions are getting assigned after the log splitting.
> -----------------------------------------------------------------
>
>                 Key: HBASE-5782
>                 URL: https://issues.apache.org/jira/browse/HBASE-5782
>             Project: HBase
>          Issue Type: Bug
>          Components: wal
>    Affects Versions: 0.94.0
>            Reporter: Gopinathan A
>            Assignee: ramkrishna.s.vasudevan
>            Priority: Blocker
>             Fix For: 0.94.0
>
>         Attachments: 5782.txt, HBASE-5782.patch
>
>
> Create a table with 1000 splits, after the region assignemnt, kill the regionserver wich
contains META table.
> Here few regions are missing after the log splitting and region assigment. HBCK report
shows multiple region holes are got created.
> Same scenario was verified mulitple times in 0.92.1, no issues.

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