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From "Tsz Wo Nicholas Sze (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-8681) BlockScanner is incorrectly disabled by default
Date Sun, 28 Jun 2015 11:35:04 GMT

    [ https://issues.apache.org/jira/browse/HDFS-8681?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14604644#comment-14604644
] 

Tsz Wo Nicholas Sze commented on HDFS-8681:
-------------------------------------------

The failure of TestFsDatasetImpl seems related to the patch.  Please take a look.

> 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
>         Attachments: HDFS-8681.01.patch, HDFS-8681.02.patch, HDFS-8681.03.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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