keith-turner commented on PR #4840:
URL: https://github.com/apache/accumulo/pull/4840#issuecomment-2310927037
When running the new IT can look in the tablet server logs and see the
following new log message for zombie scans.
```
2024-08-26T19:28:27,963 [session.ScanSession] WARN : Scan session with no
client active for 6148ms has a zombie scan thread. Scan session info :
SingleScanSession REMOVED startTime:1724700493420 lastAccessTime:1724700494426
client:127.0.0.1:45214 tableId:1
java.lang.Exception: Fake exception to capture stack trace of zombie scan.
Thread id:134
at java.base/jdk.internal.misc.Unsafe.park(Native Method) ~[?:?]
at
java.base/java.util.concurrent.locks.LockSupport.park(LockSupport.java:194)
~[?:?]
at
java.base/java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:885)
~[?:?]
at
java.base/java.util.concurrent.locks.AbstractQueuedSynchronizer.doAcquireShared(AbstractQueuedSynchronizer.java:1009)
~[?:?]
at
java.base/java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireShared(AbstractQueuedSynchronizer.java:1324)
~[?:?]
at
java.base/java.util.concurrent.Semaphore.acquireUninterruptibly(Semaphore.java:504)
~[?:?]
at
org.apache.accumulo.test.ZombieScanIT$ZombieIterator.hasTop(ZombieScanIT.java:93)
~[classes/:?]
at
org.apache.accumulo.core.iteratorsImpl.system.SourceSwitchingIterator.readNext(SourceSwitchingIterator.java:188)
~[classes/:?]
at
org.apache.accumulo.core.iteratorsImpl.system.SourceSwitchingIterator.seek(SourceSwitchingIterator.java:237)
~[classes/:?]
at
org.apache.accumulo.tserver.tablet.TabletBase.nextBatch(TabletBase.java:263)
~[classes/:?]
at org.apache.accumulo.tserver.tablet.Scanner.read(Scanner.java:120)
~[classes/:?]
at
org.apache.accumulo.tserver.scan.NextBatchTask.run(NextBatchTask.java:78)
~[classes/:?]
at
org.apache.accumulo.tserver.session.ScanSession$ScanMeasurer.run(ScanSession.java:70)
~[classes/:?]
at
org.apache.accumulo.core.trace.TraceWrappedRunnable.run(TraceWrappedRunnable.java:52)
~[classes/:?]
at
java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
[?:?]
at
java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
[?:?]
at
org.apache.accumulo.core.trace.TraceWrappedRunnable.run(TraceWrappedRunnable.java:52)
[classes/:?]
at java.base/java.lang.Thread.run(Thread.java:829) [?:?]
```
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