yuanboliu opened a new pull request, #4230:
URL: https://github.com/apache/hadoop/pull/4230
…lock to read lock
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### Description of PR
In a very busy authed cluster, renewing/caneling/getting delegation 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)
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