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https://issues.apache.org/jira/browse/HDFS-6114?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Vinayakumar B updated HDFS-6114:
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Attachment: HDFS-6114.patch
Updated patch with above comments. Please review
> Block Scan log rolling will never happen if blocks written continuously
> leading to huge size of dncp_block_verification.log.curr
> --------------------------------------------------------------------------------------------------------------------------------
>
> Key: HDFS-6114
> URL: https://issues.apache.org/jira/browse/HDFS-6114
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: datanode
> Affects Versions: 2.3.0, 2.4.0
> Reporter: Vinayakumar B
> Assignee: Vinayakumar B
> Priority: Critical
> Attachments: HDFS-6114.patch, HDFS-6114.patch, HDFS-6114.patch,
> HDFS-6114.patch
>
>
> 1. {{BlockPoolSliceScanner#scan()}} will not return until all the blocks are
> scanned.
> 2. If the blocks (with size in several MBs) to datanode are written
> continuously
> then one iteration of {{BlockPoolSliceScanner#scan()}} will be continously
> scanning the blocks
> 3. These blocks will be deleted after some time (enough to get block scanned)
> 4. As Block Scanning is throttled, So verification of all blocks will take so
> much time.
> 5. Rolling will never happen, so even though the total number of blocks in
> datanode doesn't increases, entries ( which contains stale entries of deleted
> blocks) in *dncp_block_verification.log.curr* continuously increases leading
> to huge size.
> In one of our env, it grown more than 1TB where total number of blocks were
> only ~45k.
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