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https://issues.apache.org/jira/browse/HBASE-1416?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12792910#action_12792910
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Andrew Purtell commented on HBASE-1416:
---------------------------------------
Do we still want to do this? Seems some of Ryan's ideas have been implemented
as HBASE-1939 already.
I was playing around with this the other day after committing HBASE-2059. On
that note, implementing an HLog.Writer that stripes edits over a pool of logs
under a directory instead of a single file works ok on read and write paths but
split and roll code assumes the log is a single file so barf when they access a
dir instead; the HLog.Writer interface would need to be widened with split and
roll methods to make that work cleanly. Anyway, sync is still a log pole and
with striped writes over a pool of HLogs there are more dirty blocks to sync.
Unless the current edit load is high we end up dirtying small bits of a bunch
of blocks where instead we should just write them all into one as they'll all
fit in there.
> Pool of commit loggers in each HRegionServer
> --------------------------------------------
>
> Key: HBASE-1416
> URL: https://issues.apache.org/jira/browse/HBASE-1416
> Project: Hadoop HBase
> Issue Type: Bug
> Reporter: stack
> Fix For: 0.21.0
>
>
> HBASE-1394 discusses pools of loggers as means of our being able to dump out
> the logs faster; commit log is log pole in a write transaction. This issue
> is about implementing the pool of writers.
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