[ https://issues.apache.org/jira/browse/HDFS-5651?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13861563#comment-13861563 ] 

Hudson commented on HDFS-5651:
------------------------------

SUCCESS: Integrated in Hadoop-Mapreduce-trunk #1658 (See [https://builds.apache.org/job/Hadoop-Mapreduce-trunk/1658/])
HDFS-5651. Remove dfs.namenode.caching.enabled and improve CRM locking. Contributed by Colin Patrick McCabe. (wang: http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1555002)
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSConfigKeys.java
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/CacheReplicationMonitor.java
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/DatanodeManager.java
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/CacheManager.java
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/resources/hdfs-default.xml
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/site/apt/CentralizedCacheManagement.apt.vm
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/TestFsDatasetCache.java
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestCacheDirectives.java
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/ha/TestHAStateTransitions.java


> Remove dfs.namenode.caching.enabled and improve CRM locking
> -----------------------------------------------------------
>
>                 Key: HDFS-5651
>                 URL: https://issues.apache.org/jira/browse/HDFS-5651
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: namenode
>    Affects Versions: 3.0.0
>            Reporter: Colin Patrick McCabe
>            Assignee: Colin Patrick McCabe
>             Fix For: 3.0.0
>
>         Attachments: HDFS-5651.001.patch, HDFS-5651.002.patch, HDFS-5651.003.patch, HDFS-5651.004.patch, HDFS-5651.006.patch, HDFS-5651.006.patch, HDFS-5651.008.patch, HDFS-5651.009.patch
>
>
> We can remove dfs.namenode.caching.enabled and simply always enable caching, similar to how we do with snapshots and other features.  The main overhead is the size of the cachedBlocks GSet.  However, we can simply make the size of this GSet configurable, and people who don't want caching can set it to a very small value.



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