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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:
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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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