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https://issues.apache.org/jira/browse/HDFS-15764?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Yang Yun updated HDFS-15764:
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Attachment: HDFS-15764.007.patch
Status: Patch Available (was: Open)
> 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,
> HDFS-15764.003.patch, HDFS-15764.004.patch, HDFS-15764.005.patch,
> HDFS-15764.006.patch, HDFS-15764.007.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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