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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-6466) Enable multi-thread for memstore flush
Date Wed, 23 Jan 2013 12:34:15 GMT

    [ https://issues.apache.org/jira/browse/HBASE-6466?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13560639#comment-13560639
] 

Hudson commented on HBASE-6466:
-------------------------------

Integrated in HBase-TRUNK-on-Hadoop-2.0.0 #368 (See [https://builds.apache.org/job/HBase-TRUNK-on-Hadoop-2.0.0/368/])
    HBASE-6466 Revert, TestLogRolling failed twice on trunk build (Revision 1437274)
HBASE-6466 Enable multi-thread for memstore flush (Chunhui) (Revision 1437252)

     Result = FAILURE
tedyu : 
Files : 
* /hbase/trunk/hbase-common/src/main/java/org/apache/hadoop/hbase/util/Threads.java
* /hbase/trunk/hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/HRegionServer.java
* /hbase/trunk/hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/MemStoreFlusher.java
* /hbase/trunk/hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/wal/FSHLog.java

tedyu : 
Files : 
* /hbase/trunk/hbase-common/src/main/java/org/apache/hadoop/hbase/util/Threads.java
* /hbase/trunk/hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/HRegionServer.java
* /hbase/trunk/hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/MemStoreFlusher.java
* /hbase/trunk/hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/wal/FSHLog.java

                
> 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: 6466-v6.patch, 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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