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From "Jakob Homan (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-1110) Namenode heap optimization - reuse objects for commonly used file names
Date Tue, 27 Apr 2010 21:53:33 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1110?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12861567#action_12861567
] 

Jakob Homan commented on HDFS-1110:
-----------------------------------

bq. Build a tool to generate list names that is used more than 10 times from fsimage.
Also, we don't actually have to build a separate tool, as the offline image viewer can quickly
be extended to provide these numbers and generate the new file.  The numbers above were generated
from just a few lines in a new viewer.

> 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.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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