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From "Raghu Angadi (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-6017) NameNode and SecondaryNameNode fail to restart because of abnormal filenames.
Date Tue, 16 Jun 2009 19:53:07 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-6017?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12720316#action_12720316
] 

Raghu Angadi commented on HADOOP-6017:
--------------------------------------

This fixes actual bug. The edits file is not corrupted. It is just that NameNode didn't handle
filenames properly for certain edit log entries. With this patch, NN and secondary NN can
handle the same edit log properly.

> NameNode and SecondaryNameNode fail to restart because of abnormal filenames.
> -----------------------------------------------------------------------------
>
>                 Key: HADOOP-6017
>                 URL: https://issues.apache.org/jira/browse/HADOOP-6017
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: dfs
>    Affects Versions: 0.18.3
>            Reporter: Raghu Angadi
>            Assignee: Tsz Wo (Nicholas), SZE
>            Priority: Blocker
>             Fix For: 0.18.4, 0.19.2, 0.20.1, 0.21.0
>
>         Attachments: 6017_20090611.patch, 6017_20090611b.patch, HADOOP-6017-branch-18.patch,
HADOOP-6017-branch-20.patch
>
>
> SecondaryNameNode (and NameNode) fail to load the edits log.  I will include stack trace
in next comment.
> This is traced to the fact that LeaseManager uses {{String.relaceFirst()}} to replace
front of a sting with another string. Unfortunately {{replaceFirst()}} uses regex, though
the first argument is {{quoted}} by the code, the second argument is not. (the second arg
is not really treated as regex but still gets processed for back references (as in '{{sed
s/first/second/g}}')
> As Nicholas suggested, it is just simpler to use {{substring()}} to replace part of the
string.

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