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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HDFS-755) Read multiple checksum chunks at once in DFSInputStream
Date Thu, 03 Dec 2009 22:20:20 GMT

     [ https://issues.apache.org/jira/browse/HDFS-755?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Todd Lipcon updated HDFS-755:

    Attachment: hdfs-755.txt

bq. Did you test w/o checksums enabled?

TestDFSShell covers this case by corrupting a block and reading it with the -ignoreCrc option.
Some other tests cover this too - I added a printout in DFSInputStream to fire when checksums
were disabled and it did so. In investigating this I also noticed that TestFSInputChecker
in hdfs was supposed to do this, but actually didn't (there was an unused "readCS" parameter).
This new patch fixes that bug in the test.

> Read multiple checksum chunks at once in DFSInputStream
> -------------------------------------------------------
>                 Key: HDFS-755
>                 URL: https://issues.apache.org/jira/browse/HDFS-755
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: hdfs client
>    Affects Versions: 0.22.0
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>         Attachments: hdfs-755.txt, hdfs-755.txt, hdfs-755.txt, hdfs-755.txt, hdfs-755.txt
> HADOOP-3205 adds the ability for FSInputChecker subclasses to read multiple checksum
chunks in a single call to readChunk. This is the HDFS-side use of that new feature.

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