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From "Tsz Wo (Nicholas), SZE (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-1110) Namenode heap optimization - reuse objects for commonly used file names
Date Fri, 18 Jun 2010 23:02:24 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1110?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12880355#action_12880355
] 

Tsz Wo (Nicholas), SZE commented on HDFS-1110:
----------------------------------------------

Hi Suresh, new commit should be appended at end of the list in CHANGE.txt but not inserted
in the beginning.

{noformat}
--- hadoop/hdfs/trunk/CHANGES.txt	2010/06/11 18:09:48	953802
+++ hadoop/hdfs/trunk/CHANGES.txt	2010/06/11 18:15:17	953803
@@ -9,6 +9,9 @@
 
   IMPROVEMENTS
 
+    HDFS-1110. Reuses objects for commonly used file names in namenode to
+    reduce the heap usage. (suresh)
+
     HDFS-1096. fix for prev. commit. (boryas)
{noformat}


> Namenode heap optimization - reuse objects for commonly used file names
> -----------------------------------------------------------------------
>
>                 Key: HDFS-1110
>                 URL: https://issues.apache.org/jira/browse/HDFS-1110
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>            Reporter: Suresh Srinivas
>            Assignee: Suresh Srinivas
>             Fix For: 0.22.0
>
>         Attachments: hdfs-1110.2.patch, hdfs-1110.3.patch, hdfs-1110.4.patch, hdfs-1110.5.patch,
hdfs-1110.6.patch, hdfs-1110.patch, hdfs-1110.y20.patch
>
>
> There are a lot of common file names used in HDFS, mainly created by mapreduce, such
as file names starting with "part". Reusing byte[] corresponding to these recurring file names
will save significant heap space used for storing the file names in millions of INodeFile
objects.

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