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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-10940) Reduce performance penalty of block caching when not used
Date Mon, 03 Oct 2016 17:02:20 GMT

    [ https://issues.apache.org/jira/browse/HDFS-10940?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15542870#comment-15542870
] 

Hudson commented on HDFS-10940:
-------------------------------

SUCCESS: Integrated in Jenkins build Hadoop-trunk-Commit #10531 (See [https://builds.apache.org/job/Hadoop-trunk-Commit/10531/])
HDFS-10940. Reduce performance penalty of block caching when not used. (kihwal: rev 744208431f7365bf054e6b773b86af2583001e1d)
* (edit) hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/BlockManager.java
* (edit) hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestCacheDirectives.java
* (edit) hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSDirStatAndListingOp.java
* (edit) hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/CacheManager.java


> Reduce performance penalty of block caching when not used
> ---------------------------------------------------------
>
>                 Key: HDFS-10940
>                 URL: https://issues.apache.org/jira/browse/HDFS-10940
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: namenode
>    Affects Versions: 2.7
>            Reporter: Daryn Sharp
>            Assignee: Daryn Sharp
>             Fix For: 2.8.0, 3.0.0-alpha2
>
>         Attachments: HDFS-10940.patch
>
>
> For every block location generated, the CacheManager will create a junk object for a
hash lookup of cached locations.  If there are no cached blocks, none of this is required.



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