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https://issues.apache.org/jira/browse/HBASE-6466?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13560451#comment-13560451
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Hudson commented on HBASE-6466:
-------------------------------
Integrated in HBase-TRUNK #3781 (See
[https://builds.apache.org/job/HBase-TRUNK/3781/])
HBASE-6466 Revert, TestLogRolling failed twice on trunk build (Revision
1437274)
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
> 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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