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From "Suresh Srinivas (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-4538) allow use of legacy blockreader
Date Tue, 02 Apr 2013 21:35:15 GMT

     [ https://issues.apache.org/jira/browse/HDFS-4538?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Suresh Srinivas updated HDFS-4538:
----------------------------------

    Release Note: Short circuit read mechanism enabled in HDFS-2246 will stop working with
this change. Hence this jira is marked incompatible. Please set "dfs.client.use.legacy.blockreader.local"
to true in the configuration file to enable the HDFS-2246 short circuit mechanism back.
    
> allow use of legacy blockreader
> -------------------------------
>
>                 Key: HDFS-4538
>                 URL: https://issues.apache.org/jira/browse/HDFS-4538
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: datanode, hdfs-client, performance
>            Reporter: Colin Patrick McCabe
>            Assignee: Colin Patrick McCabe
>         Attachments: HDFS-4538.001.patch, HDFS-4538.002.patch, HDFS-4538.003.patch, HDFS-4538.004.patch
>
>
> Some users might want to use the legacy block reader, because it is available on Windows,
whereas the secure solution has not yet been implemented there.  As described in the mailing
list discussion, let's enable this.

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