Daniel Ma created HDFS-16869:
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Summary: DelegationTokenRenewer timeout feature may cause high
utilization of CPU and object leak
Key: HDFS-16869
URL: https://issues.apache.org/jira/browse/HDFS-16869
Project: Hadoop HDFS
Issue Type: Improvement
Affects Versions: 3.3.4, 3.3.3, 3.3.2, 3.3.1
Reporter: Daniel Ma
Assignee: Daniel Ma
DelegationTokenRenewer timeout feature may cause high utilization of CPU and
object leak。
1-If yarn cluster is in idle state, that is almost no token renewer event
triggered, the DelegationTokenRenewerPoolTracker thread will do nothing but
dead loop, it will cause high CPU utilization.
2-The renewer event is hold in a map named futures, will has no remove logic ,
that is the map will become increasingly great with time going by.
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