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From "Colin Patrick McCabe (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-7430) Refactor the BlockScanner to use O(1) memory and use multiple threads
Date Mon, 24 Nov 2014 04:47:12 GMT

     [ https://issues.apache.org/jira/browse/HDFS-7430?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Colin Patrick McCabe updated HDFS-7430:
---------------------------------------
    Attachment: HDFS-7430.002.patch

remove debug message

> Refactor 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
>         Attachments: HDFS-7430.002.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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