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https://issues.apache.org/jira/browse/HBASE-1364?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12865366#action_12865366
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Alex Newman commented on HBASE-1364:
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So I tested just launching the LogSplitter thread early and it works just fine.
It required putting more information into zk. Basically when the logSplitter
is finished splitting it drops the path of the split made into zookeeper, so
the master can receive it, when they are all done.
Stack can you remove my earlier comments.
> [performance] Distributed splitting of regionserver commit logs
> ---------------------------------------------------------------
>
> Key: HBASE-1364
> URL: https://issues.apache.org/jira/browse/HBASE-1364
> Project: Hadoop HBase
> Issue Type: Improvement
> Reporter: stack
> Assignee: Alex Newman
> Priority: Critical
> Fix For: 0.21.0
>
>
> HBASE-1008 has some improvements to our log splitting on regionserver crash;
> but it needs to run even faster.
> (Below is from HBASE-1008)
> In bigtable paper, the split is distributed. If we're going to have 1000
> logs, we need to distribute or at least multithread the splitting.
> 1. As is, regions starting up expect to find one reconstruction log only.
> Need to make it so pick up a bunch of edit logs and it should be fine that
> logs are elsewhere in hdfs in an output directory written by all split
> participants whether multithreaded or a mapreduce-like distributed process
> (Lets write our distributed sort first as a MR so we learn whats involved;
> distributed sort, as much as possible should use MR framework pieces). On
> startup, regions go to this directory and pick up the files written by split
> participants deleting and clearing the dir when all have been read in. Making
> it so can take multiple logs for input, can also make the split process more
> robust rather than current tenuous process which loses all edits if it
> doesn't make it to the end without error.
> 2. Each column family rereads the reconstruction log to find its edits. Need
> to fix that. Split can sort the edits by column family so store only reads
> its edits.
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