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https://issues.apache.org/jira/browse/HBASE-5782?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13256085#comment-13256085
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stack commented on HBASE-5782:
------------------------------
I tried to reproduce what JD is seeing on cluster using same sized keys and
values but Lars' patch completes before Todds. My test run may be too small I
did thread dumps during Lars and Todd runs. Both seem to be down in sync
mostly, down here
'org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.waitForAckedSeqno(DFSClient.java:3789)'
otherwise hung up on sync points around wal append/sync.
Lets go w/ the Lars patch because minimal changes. As per Todd, lets file an
issue to clean up this stuff with his patch as seed. From J-D work, any grease
lightening we can apply around hlog append makes for a big difference in
overall write throughput.
> Edits can be appended out of seqid order since HBASE-4487
> ---------------------------------------------------------
>
> 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-lars-v2.txt, 5782-sketch.txt, 5782.txt,
> 5782.unfinished-stack.txt, HBASE-5782.patch, hbase-5782.txt
>
>
> 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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