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From "Colin Patrick McCabe (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7430) Rewrite the BlockScanner to use O(1) memory and use multiple threads
Date Thu, 12 Feb 2015 21:15:12 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7430?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14318984#comment-14318984
] 

Colin Patrick McCabe commented on HDFS-7430:
--------------------------------------------

Once HDFS-7686 is committed (should be later today once another Jenkins run happens), I think
we should merge this to branch-2.

> Rewrite the BlockScanner to use O(1) memory and use multiple threads
> --------------------------------------------------------------------
>
>                 Key: HDFS-7430
>                 URL: https://issues.apache.org/jira/browse/HDFS-7430
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>    Affects Versions: 2.7.0
>            Reporter: Colin Patrick McCabe
>            Assignee: Colin Patrick McCabe
>             Fix For: 3.0.0
>
>         Attachments: HDFS-7430.002.patch, HDFS-7430.003.patch, HDFS-7430.004.patch, HDFS-7430.005.patch,
HDFS-7430.006.patch, HDFS-7430.007.patch, HDFS-7430.008.patch, HDFS-7430.009.patch, HDFS-7430.010.patch,
HDFS-7430.011.patch, HDFS-7430.012.patch, memory.png
>
>
> We should update the BlockScanner to use a constant amount of memory by keeping track
of what block was scanned last, rather than by tracking the scan status of all blocks in memory.
 Also, instead of having just one thread, we should have a verification thread per hard disk
(or other volume), scanning at a configurable rate of bytes per second.



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