[HDFS-16671] RBF: RouterRpcFairnessPolicyController supports configurable permit acquire timeout

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 3.4.0
• Fix Version/s: 3.4.0
• Component/s: rbf
• Labels: pull-request-available
• Target Version/s: 3.4.0
• Hadoop Flags: Reviewed
• Assignee: ZanderXu
• Reporter: ZanderXu
• Created: 20/Jul/22 12:31
• Updated: 11/Feb/24 10:48
• Resolved: 28/Jul/22 07:44

Description

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.

"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)

Issue Links

• links to: GitHub Pull Request #4597