keith-ratcliffe commented on issue #1975:
URL: https://github.com/apache/accumulo/issues/1975#issuecomment-807283723
@ben-manes Thanks. I believe you are correct. Here's a jstack exerpt showing
a deadlock that we experienced...
```
at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1692)
at
java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:175)
"User: **** Start: 1612279224878 Client: xxx.xxx.xxx.xxx:41554 Tablet:
f;20190610_21;20190610_20":
at sun.misc.Unsafe.park(Native Method)
- parking to wait for <0x000000052ae8b878> (a
java.util.concurrent.locks.ReentrantLock$NonfairSync)
at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
at
java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:836)
at
java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireQueued(AbstractQueuedSynchronizer.java:870)
at
java.util.concurrent.locks.AbstractQueuedSynchronizer.acquire(AbstractQueuedSynchronizer.java:1199)
at
java.util.concurrent.locks.ReentrantLock$NonfairSync.lock(ReentrantLock.java:209)
at
java.util.concurrent.locks.ReentrantLock.lock(ReentrantLock.java:285)
at
com.github.benmanes.caffeine.cache.BoundedLocalCache$BoundedPolicy$BoundedEviction.getMaximum(BoundedLocalCache.java:3454)
at
org.apache.accumulo.core.file.blockfile.cache.tinylfu.TinyLfuBlockCache.load(TinyLfuBlockCache.java:204)
at
org.apache.accumulo.core.file.blockfile.cache.tinylfu.TinyLfuBlockCache.lambda$getBlock$2(TinyLfuBlockCache.java:238)
at
org.apache.accumulo.core.file.blockfile.cache.tinylfu.TinyLfuBlockCache$$Lambda$129/316262722.apply(Unknown
Source)
at
com.github.benmanes.caffeine.cache.LocalCache.lambda$statsAware$0(LocalCache.java:142)
at
com.github.benmanes.caffeine.cache.LocalCache$$Lambda$130/304458428.apply(Unknown
Source)
at
com.github.benmanes.caffeine.cache.BoundedLocalCache.lambda$doComputeIfAbsent$14(BoundedLocalCache.java:2337)
at
com.github.benmanes.caffeine.cache.BoundedLocalCache$$Lambda$131/899711363.apply(Unknown
Source)
at
java.util.concurrent.ConcurrentHashMap.compute(ConcurrentHashMap.java:1892)
- locked <0x0000000685ba4df0> (a
java.util.concurrent.ConcurrentHashMap$Node)
at
com.github.benmanes.caffeine.cache.BoundedLocalCache.doComputeIfAbsent(BoundedLocalCache.java:2335)
```
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