4

Ehcache version

2.10.6

Once in a while, Ehcache servers are getting down because of the threads getting blocked. Please find below the details about the bucket configuration and thread details which are blocking each other.

There are multiple buckets: Bucket configuration

<cache name="bucket1"
           maxBytesLocalHeap="300m"
           maxBytesLocalDisk="15g"
           timeToIdleSeconds="240"
           timeToLiveSeconds="240"
           eternal="false"
           diskSpoolBufferSizeMB="30"
           memoryStoreEvictionPolicy="LFU"
           diskExpiryThreadIntervalSeconds="360"
           transactionalMode="off"
           diskPersistent="true">
    </cache>

Thread dump

http-nio-8080-exec-26
Stack Trace is:
java.lang.Thread.State: BLOCKED (on object monitor)
at net.sf.ehcache.store.cachingtier.OnHeapCachingTier$Fault.get(OnHeapCachingTier.java:332)
- **waiting to lock <0x0000000604407968>** (a net.sf.ehcache.store.cachingtier.OnHeapCachingTier$Fault)
at net.sf.ehcache.store.cachingtier.OnHeapCachingTier$Fault.access$200(OnHeapCachingTier.java:312)
at net.sf.ehcache.store.cachingtier.OnHeapCachingTier.getValue(OnHeapCachingTier.java:300)
at net.sf.ehcache.store.cachingtier.OnHeapCachingTier.access$000(OnHeapCachingTier.java:62)
at net.sf.ehcache.store.cachingtier.OnHeapCachingTier$1.evicted(OnHeapCachingTier.java:84)
at net.sf.ehcache.store.cachingtier.PooledBasedBackEnd$1.removed(PooledBasedBackEnd.java:195)
at net.sf.ehcache.util.concurrent.ConcurrentHashMap.internalReplace(ConcurrentHashMap.java:1346)
at net.sf.ehcache.util.concurrent.ConcurrentHashMap.removeAndNotify(ConcurrentHashMap.java:2647)
at net.sf.ehcache.store.cachingtier.PooledBasedBackEnd.remove(PooledBasedBackEnd.java:113)
at net.sf.ehcache.store.cachingtier.OnHeapCachingTier.remove(OnHeapCachingTier.java:207)
at net.sf.ehcache.store.CacheStore.put(CacheStore.java:134)
at net.sf.ehcache.Cache.putInternal(Cache.java:1616)
at net.sf.ehcache.Cache.put(Cache.java:1542)
at net.sf.ehcache.Cache.put(Cache.java:1507)......



http-nio-8080-exec-174
Stack Trace is:
java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
at java.lang.Object.wait(Object.java:502)
at net.sf.ehcache.util.concurrent.ConcurrentHashMap$Node.tryAwaitLock(ConcurrentHashMap.java:687)
- locked <0x00000005fa31d820> (a net.sf.ehcache.util.concurrent.ConcurrentHashMap$Node)
at net.sf.ehcache.util.concurrent.ConcurrentHashMap.internalReplace(ConcurrentHashMap.java:1311)
at net.sf.ehcache.util.concurrent.ConcurrentHashMap.remove(ConcurrentHashMap.java:2643)
at net.sf.ehcache.store.cachingtier.PooledBasedBackEnd.evict(PooledBasedBackEnd.java:159)
at net.sf.ehcache.store.cachingtier.PooledBasedBackEnd$PoolParticipant.evict(PooledBasedBackEnd.java:251)
at net.sf.ehcache.pool.impl.FromLargestCachePoolEvictor.freeSpace(FromLargestCachePoolEvictor.java:49)
at net.sf.ehcache.pool.impl.AtomicPoolAccessor.add(AtomicPoolAccessor.java:71)
at net.sf.ehcache.pool.impl.AbstractPoolAccessor.add(AbstractPoolAccessor.java:67)
at net.sf.ehcache.store.disk.Segment.put(Segment.java:427)
at net.sf.ehcache.store.disk.DiskStore.putFaulted(DiskStore.java:229)
at net.sf.ehcache.store.CacheStore$3.call(CacheStore.java:143)
at net.sf.ehcache.store.CacheStore$3.call(CacheStore.java:137)
at net.sf.ehcache.store.cachingtier.OnHeapCachingTier$Fault.get(OnHeapCachingTier.java:335)
**- locked <0x0000000604407968> (a net.sf.ehcache.store.cachingtier.OnHeapCachingTier$Fault)**
at net.sf.ehcache.store.cachingtier.OnHeapCachingTier$Fault.access$200(OnHeapCachingTier.java:312)
at net.sf.ehcache.store.cachingtier.OnHeapCachingTier.get(OnHeapCachingTier.java:176)
at net.sf.ehcache.store.CacheStore.put(CacheStore.java:137)
at net.sf.ehcache.Cache.putInternal(Cache.java:1616)
at net.sf.ehcache.Cache.put(Cache.java:1542)
at net.sf.ehcache.Cache.put(Cache.java:1507)
.......
4

1 回答 1

1

如评论中所述，我没有真正的解释，但是...

我们在 ehcache 2.10.5 中遇到了同样的问题：只有堆缓存和休眠以及独立使用。

我们通过升级到 ehcache 3.x（当时是 3.6）来修复它。

我们没有调查 2.10 上的问题，因为它是一个过时的版本。

于 2020-07-06T10:09:33.647 回答