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From "Erik Steffl (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HDFS-1448) Create multi-format parser for edits logs file, support binary and XML formats initially
Date Tue, 21 Dec 2010 23:40:04 GMT

     [ https://issues.apache.org/jira/browse/HDFS-1448?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Erik Steffl updated HDFS-1448:
------------------------------

    Attachment: HDFS-1448-0.22-5.patch

HDFS-1448-0.22-5.patch fixes findBugs warnings,

test-patch results:

     [exec] -1 overall.
     [exec]
     [exec]     +1 @author.  The patch does not contain any @author tags.
     [exec]
     [exec]     +1 tests included.  The patch appears to include 16 new or modified tests.
     [exec]
     [exec]     +1 javadoc.  The javadoc tool did not generate any warning messages.
     [exec]
     [exec]     +1 javac.  The applied patch does not increase the total number of javac compiler
warnings.
     [exec]
     [exec]     +1 findbugs.  The patch does not introduce any new Findbugs warnings.
     [exec]
     [exec]     -1 release audit.  The applied patch generated 1 release audit warnings (more
than the trunk's current 0 warnings).

The release audit warning is caused by editsStored.xml, since it's a reference file for test
it does not have apache license included. As far as I can tell this is acceptable since it's
a file that must be exactly same as expected output of the Offline edits viewer. Let me know
if there's a (better) standard way to deal with this scenario.

> Create multi-format parser for edits logs file, support binary and XML formats initially
> ----------------------------------------------------------------------------------------
>
>                 Key: HDFS-1448
>                 URL: https://issues.apache.org/jira/browse/HDFS-1448
>             Project: Hadoop HDFS
>          Issue Type: New Feature
>          Components: tools
>    Affects Versions: 0.22.0
>            Reporter: Erik Steffl
>            Assignee: Erik Steffl
>             Fix For: 0.22.0
>
>         Attachments: editsStored, HDFS-1448-0.22-1.patch, HDFS-1448-0.22-2.patch, HDFS-1448-0.22-3.patch,
HDFS-1448-0.22-4.patch, HDFS-1448-0.22-5.patch, HDFS-1448-0.22.patch, Viewer hierarchy.pdf
>
>
> Create multi-format parser for edits logs file, support binary and XML formats initially.
> Parsing should work from any supported format to any other supported format (e.g. from
binary to XML and from XML to binary).
> The binary format is the format used by FSEditLog class to read/write edits file.
> Primary reason to develop this tool is to help with troubleshooting, the binary format
is hard to read and edit (for human troubleshooters).
> Longer term it could be used to clean up and minimize parsers for fsimage and edits files.
Edits parser OfflineEditsViewer is written in a very similar fashion to OfflineImageViewer.
Next step would be to merge OfflineImageViewer and OfflineEditsViewer and use the result in
both FSImage and FSEditLog. This is subject to change, specifically depending on adoption
of avro (which would completely change how objects are serialized as well as provide ways
to convert files to different formats).

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