ZanderXu created HDFS-16671:
-------------------------------
Summary: 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
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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