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https://issues.apache.org/jira/browse/HBASE-4714?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13141670#comment-13141670
]
Hudson commented on HBASE-4714:
-------------------------------
Integrated in HBase-TRUNK #2396 (See
[https://builds.apache.org/job/HBase-TRUNK/2396/])
HBASE-4714 Don't ship w/ icms enabled by default; REDO
HBASE-4714 Don't ship w/ icms enabled by default; REVERT -- I overcommitted by
mistake
HBASE-4714 Don't ship w/ icms enabled by default
stack :
Files :
* /hbase/trunk/CHANGES.txt
* /hbase/trunk/conf/hbase-env.sh
* /hbase/trunk/src/docbkx/performance.xml
stack :
Files :
* /hbase/trunk/CHANGES.txt
* /hbase/trunk/conf/hbase-env.sh
* /hbase/trunk/src/docbkx/performance.xml
* /hbase/trunk/src/main/java/org/apache/hadoop/hbase/HConstants.java
*
/hbase/trunk/src/main/java/org/apache/hadoop/hbase/master/MasterFileSystem.java
*
/hbase/trunk/src/main/java/org/apache/hadoop/hbase/master/handler/CreateTableHandler.java
*
/hbase/trunk/src/main/java/org/apache/hadoop/hbase/util/FSTableDescriptors.java
* /hbase/trunk/src/main/java/org/apache/hadoop/hbase/util/FSUtils.java
* /hbase/trunk/src/main/java/org/apache/hadoop/hbase/util/HMerge.java
* /hbase/trunk/src/main/java/org/apache/hadoop/hbase/util/Merge.java
*
/hbase/trunk/src/test/java/org/apache/hadoop/hbase/master/TestMasterFailover.java
*
/hbase/trunk/src/test/java/org/apache/hadoop/hbase/regionserver/TestHRegionInfo.java
*
/hbase/trunk/src/test/java/org/apache/hadoop/hbase/util/TestFSTableDescriptors.java
* /hbase/trunk/src/test/java/org/apache/hadoop/hbase/util/TestFSUtils.java
* /hbase/trunk/src/test/java/org/apache/hadoop/hbase/util/TestMergeTable.java
* /hbase/trunk/src/test/java/org/apache/hadoop/hbase/util/TestMergeTool.java
stack :
Files :
* /hbase/trunk/CHANGES.txt
* /hbase/trunk/conf/hbase-env.sh
* /hbase/trunk/src/docbkx/performance.xml
* /hbase/trunk/src/main/java/org/apache/hadoop/hbase/HConstants.java
*
/hbase/trunk/src/main/java/org/apache/hadoop/hbase/master/MasterFileSystem.java
*
/hbase/trunk/src/main/java/org/apache/hadoop/hbase/master/handler/CreateTableHandler.java
*
/hbase/trunk/src/main/java/org/apache/hadoop/hbase/util/FSTableDescriptors.java
* /hbase/trunk/src/main/java/org/apache/hadoop/hbase/util/FSUtils.java
* /hbase/trunk/src/main/java/org/apache/hadoop/hbase/util/HMerge.java
* /hbase/trunk/src/main/java/org/apache/hadoop/hbase/util/Merge.java
*
/hbase/trunk/src/test/java/org/apache/hadoop/hbase/master/TestMasterFailover.java
*
/hbase/trunk/src/test/java/org/apache/hadoop/hbase/regionserver/TestHRegionInfo.java
*
/hbase/trunk/src/test/java/org/apache/hadoop/hbase/util/TestFSTableDescriptors.java
* /hbase/trunk/src/test/java/org/apache/hadoop/hbase/util/TestFSUtils.java
* /hbase/trunk/src/test/java/org/apache/hadoop/hbase/util/TestMergeTable.java
* /hbase/trunk/src/test/java/org/apache/hadoop/hbase/util/TestMergeTool.java
> Don't ship w/ icms enabled by default
> -------------------------------------
>
> Key: HBASE-4714
> URL: https://issues.apache.org/jira/browse/HBASE-4714
> Project: HBase
> Issue Type: Task
> Reporter: stack
> Assignee: stack
> Fix For: 0.92.0
>
> Attachments: icms-v2.txt, icms.txt
>
>
> "Incremental CMS (iCMS) was written for a specific use case - 1 or 2 hardware
> threads where concurrent activity by CMS would look like a STW (if
> only 1 hardware thread) or a high tax on the cpu cycles (2 hardware
> threads). It has a higher overhead and also is less efficient in terms
> of identifying garbage. The latter is because iCMS spreads out the
> concurrent work so that objects that it has identified as live earlier
> may actually be dead when the dead objects are swept up. It's
> worth testing with regular CMS instead of iCMS."
> From recent hotspot mailing list message.
> Rare is the case where we run on systems of 1 or 2 hardware threads (other
> than fellows laptops and there the above likely doesn't matter).
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