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From "Tsz Wo (Nicholas), SZE (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HDFS-1114) Reducing NameNode memory usage by an alternate hash table
Date Sat, 03 Jul 2010 00:37:53 GMT

     [ https://issues.apache.org/jira/browse/HDFS-1114?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Tsz Wo (Nicholas), SZE updated HDFS-1114:

    Attachment: gset20100702.pdf

gset20100702.pdf: added a result section.

> Reducing NameNode memory usage by an alternate hash table
> ---------------------------------------------------------
>                 Key: HDFS-1114
>                 URL: https://issues.apache.org/jira/browse/HDFS-1114
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: name-node
>            Reporter: Tsz Wo (Nicholas), SZE
>            Assignee: Tsz Wo (Nicholas), SZE
>             Fix For: 0.22.0
>         Attachments: benchmark20100618.patch, GSet20100525.pdf, gset20100608.pdf, gset20100702.pdf,
h1114_20100607.patch, h1114_20100614b.patch, h1114_20100615.patch, h1114_20100616b.patch,
h1114_20100617.patch, h1114_20100617b.patch, h1114_20100617b2_y0.20.1xx.patch, h1114_20100617b_y0.20.1xx.patch
> NameNode uses a java.util.HashMap to store BlockInfo objects.  When there are many blocks
in HDFS, this map uses a lot of memory in the NameNode.  We may optimize the memory usage
by a light weight hash table implementation.

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