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https://issues.apache.org/jira/browse/HBASE-7006?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13647278#comment-13647278
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Ted Yu commented on HBASE-7006:
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bq. we can do a HLog to region opening RS collocation
Without multi WAL, the above implies that all regions from one failed region
server be assigned to one active region server. This negates the performance
benefit of distributed log splitting.
bq. assigning all regions in one group to a RS
I guess the underlying assumption above is that there are several region groups
in multi WAL such that we gain parallelism across multiple active region
servers.
> [MTTR] Study distributed log splitting to see how we can make it faster
> -----------------------------------------------------------------------
>
> Key: HBASE-7006
> URL: https://issues.apache.org/jira/browse/HBASE-7006
> Project: HBase
> Issue Type: Bug
> Components: MTTR
> Reporter: stack
> Assignee: Jeffrey Zhong
> Priority: Critical
> Fix For: 0.95.1
>
> Attachments: hbase-7006-combined.patch, hbase-7006-combined-v1.patch,
> hbase-7006-combined-v3.patch, hbase-7006-combined-v4.patch, LogSplitting
> Comparison.pdf,
> ProposaltoimprovelogsplittingprocessregardingtoHBASE-7006-v2.pdf
>
>
> Just saw interesting issue where a cluster went down hard and 30 nodes had
> 1700 WALs to replay. Replay took almost an hour. It looks like it could run
> faster that much of the time is spent zk'ing and nn'ing.
> Putting in 0.96 so it gets a look at least. Can always punt.
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