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From "Arpit Agarwal (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-8681) BlockScanner is incorrectly disabled by default
Date Sun, 28 Jun 2015 21:55:04 GMT

     [ https://issues.apache.org/jira/browse/HDFS-8681?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Arpit Agarwal updated HDFS-8681:
--------------------------------
       Resolution: Fixed
    Fix Version/s: 2.7.1
           Status: Resolved  (was: Patch Available)

The test failure looks unrelated and I fixed the whitespace issue on commit. The checkstyle
issue can be ignored, adjacent lines in the same file are all over 80 characters. Perhaps
we can clean up the file in another commit.

Thanks for the reviews [~szetszwo] and [~jnp]. Committed for 2.7. Also thanks for reporting
this [~andrew.wang], good catch.

> BlockScanner is incorrectly disabled by default
> -----------------------------------------------
>
>                 Key: HDFS-8681
>                 URL: https://issues.apache.org/jira/browse/HDFS-8681
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: datanode
>    Affects Versions: 2.7.0
>            Reporter: Andrew Wang
>            Assignee: Arpit Agarwal
>            Priority: Blocker
>             Fix For: 2.7.1
>
>         Attachments: HDFS-8681.01.patch, HDFS-8681.02.patch, HDFS-8681.03.patch, HDFS-8681.04.patch
>
>
> This code is used to check whether the block scanner is enabled:
> {noformat}
>   public boolean isEnabled() {
>     return (conf.scanPeriodMs) > 0 && (conf.targetBytesPerSec > 0);
>   }
> {noformat}
> Unfortunately, when this was introduced, we did not change the default scan period's
value of 0, which means by default the BlockScanner is disabled.



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