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Posted to common-dev@hadoop.apache.org by "stack (JIRA)" <ji...@apache.org> on 2007/12/12 08:13:43 UTC

[jira] Updated: (HADOOP-2407) [hbase] Keeping MapFile.Reader open is expensive: Part 2

     [ https://issues.apache.org/jira/browse/HADOOP-2407?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

stack updated HADOOP-2407:
--------------------------

    Attachment: hsf.patch

Force reading of MapFile index

> [hbase] Keeping MapFile.Reader open is expensive: Part 2
> --------------------------------------------------------
>
>                 Key: HADOOP-2407
>                 URL: https://issues.apache.org/jira/browse/HADOOP-2407
>             Project: Hadoop
>          Issue Type: Improvement
>          Components: contrib/hbase
>            Reporter: stack
>             Fix For: 0.16.0
>
>         Attachments: hsf.patch
>
>
> In hbase, a mapfile.Reader can be opened and a long period of time may pass before any accesses are made against the file.  It can also be the case that a MapFile will be opened and never accessed.  For every open unaccessed MapFile -- i.e. next or a record at some offset hasn't been pulled -- we'll consume two sockets in datanode, etc.

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