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Posted to hdfs-issues@hadoop.apache.org by "Daryn Sharp (JIRA)" <ji...@apache.org> on 2014/12/01 18:35:14 UTC

[jira] [Updated] (HDFS-7433) DatanodeMap lookups are inefficient

     [ https://issues.apache.org/jira/browse/HDFS-7433?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Daryn Sharp updated HDFS-7433:
------------------------------
    Summary: DatanodeMap lookups are inefficient  (was: DatanodeMap lookups & DatanodeID hashCodes are inefficient)

> DatanodeMap lookups are inefficient
> -----------------------------------
>
>                 Key: HDFS-7433
>                 URL: https://issues.apache.org/jira/browse/HDFS-7433
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: namenode
>    Affects Versions: 2.0.0-alpha, 3.0.0
>            Reporter: Daryn Sharp
>            Assignee: Daryn Sharp
>            Priority: Critical
>         Attachments: HDFS-7433.patch, HDFS-7433.patch
>
>
> The datanode map is currently a {{TreeMap}}.  For many thousands of datanodes, tree lookups are ~10X more expensive than a {{HashMap}}.  Insertions and removals are up to 100X more expensive.



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