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From "Eli Collins (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2074) 1073: determine edit log validity by truly reading and validating transactions
Date Tue, 21 Jun 2011 16:37:47 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2074?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13052650#comment-13052650

Eli Collins commented on HDFS-2074:

+1  looks great

- javadoc for validateEditLog says it throws an IOException if it can't read the file, slightly
misleading since it eg returns EditLogValidation(0,0) if it can't read the header   
- TestFSEditLogLoader still has loglevel ALL

> 1073: determine edit log validity by truly reading and validating transactions
> ------------------------------------------------------------------------------
>                 Key: HDFS-2074
>                 URL: https://issues.apache.org/jira/browse/HDFS-2074
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: name-node
>    Affects Versions: Edit log branch (HDFS-1073)
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>             Fix For: Edit log branch (HDFS-1073)
>         Attachments: hdfs-2074.txt
> HDFS-2003 separated the deserialization/reading of log records from the application of
those records to a namesystem. This means that we can now read through an edit log in order
to determine how many valid transactions are actually stored within. This is an improvement
on what the 1073 branch currently does, which is to simply look at how many bytes come before
the 0xFFFF... trailer at the end of the file.
> The next step after this is to use these new functions so that, when the NN starts up
and finds "in-progress" files like "edits_2_inprogress", it will rename them to their finalized
name like "edits_2-30" based on how many transactions are truly stored within. This will simplify
logic elsewhere.

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