[GitHub] [accumulo] keith-ratcliffe commented on issue #1975: TinyLfu cache manager hangs in accumulo 2.0.1

[GitBox <gi...@apache.org>]

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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