Elliott Clark created HBASE-9129:
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Summary: Scanner prefetching leaks scanners.
Key: HBASE-9129
URL: https://issues.apache.org/jira/browse/HBASE-9129
Project: HBase
Issue Type: Bug
Reporter: Elliott Clark
Priority: Blocker
Running YCSB workload-e on 0.95 basically hangs the whole cluster.
YCSB opens a scanner for 100 rows.
# YCSB Calls next
# Pre-fetching starts
# YCSB Closes scanner
# Pre-fetching re-adds the scanner.
So the end result is:
{noformat}
"scan-prefetch-2-thread-45" daemon prio=10 tid=0x00007f7e406ec800 nid=0x40bc
runnable [0x00007f75ffefd000]
java.lang.Thread.State: RUNNABLE
at
org.apache.hadoop.hbase.regionserver.Leases$Lease.equals(Leases.java:272)
at java.util.PriorityQueue.indexOf(PriorityQueue.java:342)
at java.util.PriorityQueue.remove(PriorityQueue.java:360)
at java.util.concurrent.DelayQueue.remove(DelayQueue.java:476)
at
org.apache.hadoop.hbase.regionserver.Leases.removeLease(Leases.java:232)
- locked <0x00007f774455a660> (a java.util.concurrent.DelayQueue)
at
org.apache.hadoop.hbase.regionserver.RegionScannerHolder$ScanPrefetcher.call(RegionScannerHolder.java:269)
at
org.apache.hadoop.hbase.regionserver.RegionScannerHolder$ScanPrefetcher.call(RegionScannerHolder.java:260)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
at java.util.concurrent.FutureTask.run(FutureTask.java:166)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:722)
"scan-prefetch-2-thread-44" daemon prio=10 tid=0x00007f7e4c1ba800 nid=0x40bb
waiting on condition [0x00007f7605b79000]
java.lang.Thread.State: TIMED_WAITING (parking)
at sun.misc.Unsafe.park(Native Method)
- parking to wait for <0x00007f774455ad78> (a
java.util.concurrent.SynchronousQueue$TransferStack)
at
java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:226)
at
java.util.concurrent.SynchronousQueue$TransferStack.awaitFulfill(SynchronousQueue.java:460)
at
java.util.concurrent.SynchronousQueue$TransferStack.transfer(SynchronousQueue.java:359)
at java.util.concurrent.SynchronousQueue.poll(SynchronousQueue.java:942)
at
java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1068)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1130)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:722)
"scan-prefetch-2-thread-43" daemon prio=10 tid=0x00007f7e38cbc800 nid=0x40ba
waiting on condition [0x00007f7609ab8000]
java.lang.Thread.State: TIMED_WAITING (parking)
at sun.misc.Unsafe.park(Native Method)
- parking to wait for <0x00007f774455ad78> (a
java.util.concurrent.SynchronousQueue$TransferStack)
at
java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:226)
at
java.util.concurrent.SynchronousQueue$TransferStack.awaitFulfill(SynchronousQueue.java:460)
at
java.util.concurrent.SynchronousQueue$TransferStack.transfer(SynchronousQueue.java:359)
at java.util.concurrent.SynchronousQueue.poll(SynchronousQueue.java:942)
at
java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1068)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1130)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:722){noformat}
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