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Date: Mon, 8 Nov 2010 17:58:24 -0500 (EST)
From: "Erik Steffl (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
Subject: [jira] Commented: (HDFS-1448) Create multi-format parser for edits
 logs file, support binary and XML formats initially
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    [ https://issues.apache.org/jira/browse/HDFS-1448?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12929794#action_12929794 ] 

Erik Steffl commented on HDFS-1448:
-----------------------------------

HDFS-1448-0.22-2.patch is identical to HDFS-1448-0.22-1.patch except for removed temporary troubleshooting code that I forgot to remove before (in TestOfflineEditsViewer.java).

> 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.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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