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From "Erik Steffl (JIRA)" <j...@apache.org>
Subject [jira] Created: (HDFS-1448) Create multi-format parser for edits logs file, support binary and XML formats initially
Date Fri, 08 Oct 2010 22:48:30 GMT
Create multi-format parser for edits logs file, support binary and XML formats initially
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                 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
            Priority: Minor
             Fix For: 0.22.0


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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