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From "Doug Cutting (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-2172) PositionCache was removed from FSDataInputStream, causes extremely bad MapFile performance
Date Tue, 13 Nov 2007 22:24:43 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-2172?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Doug Cutting updated HADOOP-2172:
---------------------------------

    Status: Patch Available  (was: Open)

> PositionCache was removed from FSDataInputStream, causes extremely bad MapFile performance
> ------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-2172
>                 URL: https://issues.apache.org/jira/browse/HADOOP-2172
>             Project: Hadoop
>          Issue Type: Bug
>          Components: fs
>    Affects Versions: 0.15.0, 0.14.3
>            Reporter: Johan Oskarsson
>            Assignee: Doug Cutting
>            Priority: Blocker
>             Fix For: 0.15.1
>
>         Attachments: HADOOP-2172-2.patch, HADOOP-2172-2.patch, HADOOP-2172-3.patch, HADOOP-2172-4.patch,
positioncache-v1.patch
>
>
> The PositionCache in FSDataInputStream seems to have been removed in HADOOP-1470. This
causes for example MapFile.get usage to be  extremely slow as the file position isn't cached
in memory.

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