He Liangliang created HDFS-9422:
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Summary: Unnecessary FsDatasetImpl locking in DirectoryScanner
cause periodic datanode pauses
Key: HDFS-9422
URL: https://issues.apache.org/jira/browse/HDFS-9422
Project: Hadoop HDFS
Issue Type: Bug
Reporter: He Liangliang
Assignee: He Liangliang
In DirectoryScanner, the scan call hold the global dataset lock for quite long
time (typically > 5 secs for 500k blocks). This will stuck the client which
need acquire this lock. For applications like HBase, this will affect the
latency. In fact, this lock is unnecessary.
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