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Posted to notifications@accumulo.apache.org by "Arshak Navruzyan (JIRA)" <ji...@apache.org> on 2014/01/20 19:06:20 UTC

[jira] [Commented] (ACCUMULO-2223) minor corrections to 1.5 documentation regarding WAL

    [ https://issues.apache.org/jira/browse/ACCUMULO-2223?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13876641#comment-13876641 ] 

Arshak Navruzyan commented on ACCUMULO-2223:
--------------------------------------------

Awesome thanks!

> minor corrections to 1.5 documentation regarding WAL
> ----------------------------------------------------
>
>                 Key: ACCUMULO-2223
>                 URL: https://issues.apache.org/jira/browse/ACCUMULO-2223
>             Project: Accumulo
>          Issue Type: Improvement
>          Components: docs
>    Affects Versions: 1.5.0
>            Reporter: Arshak Navruzyan
>            Assignee: Arshak Navruzyan
>            Priority: Minor
>             Fix For: 1.5.1, 1.6.0
>
>         Attachments: ACCUMULO-2223.patch
>
>
> A few paragraphs in the documentation suggest that the WAL is created locally and only copied to HDFS for/during recovery. 
> 2.8. Fault-Tolerance
> The Master will coordinate the copying of write-ahead logs to HDFS so the logs are available to all tablet servers.
> 11.10. Recovery
> Recovery is performed by asking the loggers to copy their write-ahead logs into HDFS. As the logs are copied, they are also sorted, so that tablets can easily find their missing updates. The copy/sort status of each file is displayed on Accumulo monitor status page. 



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