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From "Sergey Shelukhin (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-6466) Enable multi-thread for memstore flush
Date Tue, 22 Jan 2013 19:38:14 GMT

     [ https://issues.apache.org/jira/browse/HBASE-6466?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Sergey Shelukhin updated HBASE-6466:
------------------------------------

    Attachment: HBASE-6466-v5.patch

Rebasing the patch. Should be ready to commit based on the above; medium tests pass for me,
but I'd wait for Hadoop QA.
                
> Enable multi-thread for memstore flush
> --------------------------------------
>
>                 Key: HBASE-6466
>                 URL: https://issues.apache.org/jira/browse/HBASE-6466
>             Project: HBase
>          Issue Type: Improvement
>          Components: regionserver
>    Affects Versions: 0.96.0
>            Reporter: chunhui shen
>            Assignee: chunhui shen
>            Priority: Critical
>             Fix For: 0.96.0
>
>         Attachments: HBASE-6466.patch, HBASE-6466v2.patch, HBASE-6466v3.1.patch, HBASE-6466v3.patch,
HBASE-6466-v4.patch, HBASE-6466-v4.patch, HBASE-6466-v5.patch
>
>
> If the KV is large or Hlog is closed with high-pressure putting, we found memstore is
often above the high water mark and block the putting.
> So should we enable multi-thread for Memstore Flush?
> Some performance test data for reference,
> 1.test environment : 
> random writting;upper memstore limit 5.6GB;lower memstore limit 4.8GB;400 regions per
regionserver;row len=50 bytes, value len=1024 bytes;5 regionserver, 300 ipc handler per
regionserver;5 client, 50 thread handler per client for writing
> 2.test results:
> one cacheFlush handler, tps: 7.8k/s per regionserver, Flush:10.1MB/s per regionserver,
appears many aboveGlobalMemstoreLimit blocking
> two cacheFlush handlers, tps: 10.7k/s per regionserver, Flush:12.46MB/s per regionserver,
> 200 thread handler per client & two cacheFlush handlers, tps:16.1k/s per regionserver,
Flush:18.6MB/s per regionserver

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