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Date: Fri, 4 Jun 2010 17:39:03 -0400 (EDT)
From: "Suresh Srinivas (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
Subject: [jira] Updated: (HDFS-1110) Namenode heap optimization - reuse
 objects for commonly used file names
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     [ https://issues.apache.org/jira/browse/HDFS-1110?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Suresh Srinivas updated HDFS-1110:
----------------------------------

    Attachment: hdfs-1110.4.patch

Named the class NameCache instead NameDictionary. Also moved ByteArray class to util package.

> 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.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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