Konstantin Shvachko created HDFS-15037:
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Summary: Encryption Zone operations should not block other RPC
calls while retreivingencryption keys.
Key: HDFS-15037
URL: https://issues.apache.org/jira/browse/HDFS-15037
Project: Hadoop HDFS
Issue Type: Bug
Components: encryption, namenode
Affects Versions: 2.10.0
Reporter: Konstantin Shvachko
I believe it was an intention to avoid blocking other operations while
retrieving keys with holding {{[FSDirectory.dirLock}}. But in reality all other
operations enter first {{FSNamesystemLock}} then {{dirLock}}. So they are all
blocked waiting for the key.
We see substantial increase in RPC wait time ({{RpcQueueTimeAvgTime}}) on
NameNode when encryption operations are intermixed with regular workloads.
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