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https://issues.apache.org/jira/browse/HBASE-1364?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12741509#action_12741509
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stack commented on HBASE-1364:
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I wonder if we could add list of regions to end of hlog as metadata? There
might be other useful metadata we'd want to add to an hlog. Currenlty hlog is
a sequencefile. SequenceFile takes metadata but only at its head which is no
good to us. Maybe we can hack around an hfile-like thing to use here?
> [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
> 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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