[jira] [Created] (HDFS-15037) Encryption Zone operations should not block other RPC calls while retreivingencryption keys.

["Konstantin Shvachko (Jira)" <ji...@apache.org>]

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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