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https://issues.apache.org/jira/browse/HDFS-15764?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17270015#comment-17270015
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Ayush Saxena commented on HDFS-15764:
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Thanx [~hadoop_yangyun]
It makes sense to report immediately if a block is lost and datanode has
detected it.
[~elgoiri] any thoughts on this, do you think this can cause any issues, or we
should make it configurable or it is good like this only
> Notify Namenode missing or new block on disk as soon as possible
> ----------------------------------------------------------------
>
> Key: HDFS-15764
> URL: https://issues.apache.org/jira/browse/HDFS-15764
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: datanode
> Reporter: Yang Yun
> Assignee: Yang Yun
> Priority: Minor
> Attachments: HDFS-15764.001.patch, HDFS-15764.002.patch
>
>
> When a bock file is deleted on disk or copied back to the disk, the
> DirectoryScanner can find the change, but the namenode know the change only
> untill the next full report. And in big cluster the period of full report is
> set to long time invterval.
> Call notifyNamenodeDeletedBlock if block files are deleted and call
> notifyNamenodeReceivedBlock if the block files is found agian. So the
> Incremental block report can send the change to namenode in next heartbeat.
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