Chris Nauroth created HDFS-4702:
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Summary: remove namesystem lock from DatanodeManager#fetchDatanodes
Key: HDFS-4702
URL: https://issues.apache.org/jira/browse/HDFS-4702
Project: Hadoop HDFS
Issue Type: Bug
Components: namenode
Affects Versions: 3.0.0
Reporter: Chris Nauroth
{{DatanodeManager#fetchDatanodes}} currently holds the namesystem read lock
while iterating through data nodes. This method is called from the namenode
web UI. HDFS-3990 reported a performance problem in this code path. This is a
follow-up jira to investigate whether or not we can remove the lock.
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