[
https://issues.apache.org/jira/browse/HDFS-5031?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13723858#comment-13723858
]
Vinay commented on HDFS-5031:
-----------------------------
scanning is happening multiple times. also if datanode restarted, then scanning
happens for all blocks. Since this is a major problem in datanode block scanner.
if you feel, its not actually blocker, can change it to Major. No issues.
> BlockScanner scans the block multiple times and on restart scans everything
> ---------------------------------------------------------------------------
>
> Key: HDFS-5031
> URL: https://issues.apache.org/jira/browse/HDFS-5031
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: datanode
> Affects Versions: 3.0.0, 2.1.0-beta
> Reporter: Vinay
> Assignee: Vinay
> Priority: Blocker
> Attachments: HDFS-5031.patch
>
>
> BlockScanner scans the block twice, also on restart of datanode scans
> everything.
> Steps:
> 1. Write blocks with interval of more than 5 seconds. write new block on
> completion of scan for written block.
> Each time datanode scans new block, it also scans, previous block which is
> already scanned.
> Now after restart, datanode scans all blocks again.
--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators
For more information on JIRA, see: http://www.atlassian.com/software/jira
