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https://issues.apache.org/jira/browse/HDFS-16671?focusedWorklogId=795702&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-795702
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ASF GitHub Bot logged work on HDFS-16671:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 27/Jul/22 15:03
Start Date: 27/Jul/22 15:03
Worklog Time Spent: 10m
Work Description: ZanderXu commented on PR #4597:
URL: https://github.com/apache/hadoop/pull/4597#issuecomment-1196878432
@ayushtkn I just delete `assertTrue(acquireTimeMs < 100 + 50);` in
`TestRouterRpcFairnessPolicyController#testAcquireTimeout()`. Please help me
review it again and push it forward. Thanks
Issue Time Tracking
-------------------
Worklog Id: (was: 795702)
Time Spent: 2h 10m (was: 2h)
> RBF: RouterRpcFairnessPolicyController supports configurable permit acquire
> timeout
> -----------------------------------------------------------------------------------
>
> Key: HDFS-16671
> URL: https://issues.apache.org/jira/browse/HDFS-16671
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: ZanderXu
> Assignee: ZanderXu
> Priority: Major
> Labels: pull-request-available
> Time Spent: 2h 10m
> Remaining Estimate: 0h
>
> RouterRpcFairnessPolicyController supports configurable permit acquire
> timeout. Hardcode 1s is very long, and it has causes an incident in our prod
> environment when one nameserivce is busy.
> And the optimal timeout maybe should be less than p50(avgTime).
> And all handlers in RBF is waiting to acquire the permit of the busy ns.
> {code:java}
> "IPC Server handler 12 on default port 8888" #2370 daemon prio=5 os_prio=0
> tid=? nid=? waiting on condition [?]
> java.lang.Thread.State: TIMED_WAITING (parking)
> at sun.misc.Unsafe.park(Native Method)
> - parking to wait for <?> (a
> java.util.concurrent.Semaphore$NonfairSync)
> at
> java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:215)
> at
> java.util.concurrent.locks.AbstractQueuedSynchronizer.doAcquireSharedNanos(AbstractQueuedSynchronizer.java:1037)
> at
> java.util.concurrent.locks.AbstractQueuedSynchronizer.tryAcquireSharedNanos(AbstractQueuedSynchronizer.java:1328)
> at java.util.concurrent.Semaphore.tryAcquire(Semaphore.java:409)
> at
> org.apache.hadoop.hdfs.server.federation.fairness.AbstractRouterRpcFairnessPolicyController.acquirePermit(AbstractRouterRpcFairnessPolicyController.java:56)
> at
> org.apache.hadoop.hdfs.server.federation.fairness.DynamicRouterRpcFairnessPolicyController.acquirePermit(DynamicRouterRpcFairnessPolicyController.java:123)
> at
> org.apache.hadoop.hdfs.server.federation.router.RouterRpcClient.acquirePermit(RouterRpcClient.java:1500)
> {code}
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