zhuqi created HDFS-15171:
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Summary: Add a thread to call saveDfsUsed periodically, to prevent
datanode too long restart time.
Key: HDFS-15171
URL: https://issues.apache.org/jira/browse/HDFS-15171
Project: Hadoop HDFS
Issue Type: Improvement
Components: datanode
Affects Versions: 3.2.0
Reporter: zhuqi
Assignee: zhuqi
There are 30 storage dirs in our production cluster , it will take too many
time to restart, because sometimes the datanode didn't shutdown gracefully. Now
only the datanode graceful shut down hook and the blockpoolslice shutdown will
cause the saveDfsUsed function, that cause the restart of datanode can't reuse
the dfsuse cache sometimes. I think if we can add a thread to periodically call
the saveDfsUsed function.
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