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From "Jonathan Gray (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-1513) Compactions too slow
Date Sun, 14 Jun 2009 15:44:07 GMT

    [ https://issues.apache.org/jira/browse/HBASE-1513?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12719288#action_12719288
] 

Jonathan Gray commented on HBASE-1513:
--------------------------------------

Billy, the codepath is very new for compactions in 0.20, not the same at all.  However, it
should be able to be faster with the new stuff rather than slower we just need to spend more
time optimizing.

Opened HBASE-1521 for further optimizations (marked for 0.20.1 for now), this issue really
about "fixing" slowness introduced.

> Compactions too slow
> --------------------
>
>                 Key: HBASE-1513
>                 URL: https://issues.apache.org/jira/browse/HBASE-1513
>             Project: Hadoop HBase
>          Issue Type: Bug
>          Components: regionserver
>    Affects Versions: 0.20.0
>            Reporter: Billy Pearson
>            Assignee: ryan rawson
>            Priority: Blocker
>             Fix For: 0.20.0
>
>         Attachments: HBASE-1513-v2.patch, HBASE-1513.patch
>
>
>  know there was some changes to compaction a few days back I just got back 
> to where I could run imports with the new client api
> and noticing that compactions are vary slow I meand 100x+ slower then they 
> used to be I thought one of the servers compaction thread had died
> but after retesting and ruleing that out. 
> I tested with and without compression and with and with out 
> blockcache and all are running about the same
> I got one small compaction to complete it took 1977 secs to compact 48.56MB
> thats about 25kb sec

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