[jira] [Created] (HDFS-16558) Consider changing the lock of delegation token from write lock to read lock

["Yuanbo Liu (Jira)" <ji...@apache.org>]

Yuanbo Liu created HDFS-16558:
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             Summary: Consider changing the lock of delegation token from write lock to read lock
                 Key: HDFS-16558
                 URL: https://issues.apache.org/jira/browse/HDFS-16558
             Project: Hadoop HDFS
          Issue Type: Improvement
            Reporter: Yuanbo Liu
         Attachments: image-2022-04-24-14-13-04-695.png, image-2022-04-24-14-13-52-867.png

In a very busy authed cluster, renewing/caneling/gettingdelegation token get slow and it will slow down the speed of handling rpcs from client. Since AbstractDelegationTokenSecretManager is a thread-safe manager, we propose to change the fs lock from write lock to read lock(protect editlog rolling)




!image-2022-04-24-14-13-04-695.png|width=334,height=212!

!image-2022-04-24-14-13-52-867.png|width=324,height=173!



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