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From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-1364) [performance] Distributed splitting of regionserver commit logs
Date Wed, 06 Apr 2011 21:18:06 GMT

    [ https://issues.apache.org/jira/browse/HBASE-1364?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13016539#comment-13016539
] 

stack commented on HBASE-1364:
------------------------------

I did the top 50% or so again over on rb.  Over there I write "...I'd be up for committing
this sooner rather than later, especially if its bascially working for you.  My thought is
this is a big patch and its critical functionality so commit and get the rest of the community
helping iron out bugs.  Let us know when you think its good to commit."

FYI Prakash, you need to update here when you post a new patch, at least for the moment, because
email of notifications is not working (We'll be moving to Apache's review board instance some
time soon).

> [performance] Distributed splitting of regionserver commit logs
> ---------------------------------------------------------------
>
>                 Key: HBASE-1364
>                 URL: https://issues.apache.org/jira/browse/HBASE-1364
>             Project: HBase
>          Issue Type: Improvement
>          Components: coprocessors
>            Reporter: stack
>            Assignee: Prakash Khemani
>            Priority: Critical
>             Fix For: 0.92.0
>
>         Attachments: HBASE-1364.patch
>
>          Time Spent: 8h
>  Remaining Estimate: 0h
>
> 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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