Yang Yun created HDFS-15764:
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Summary: 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
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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