I am running a cluster with 3 nodes. Then it occurs the following errors. After 
I restart one node,  the error happens again.
I don’t know why.  Who Can help me ? Thank you !!



ERROR [ReadStage-31] 2017-08-31 15:08:20,878 JVMStabilityInspector.java:141 - 
JVM state determined to be unstable.  Exiting forcefully due to:
java.lang.OutOfMemoryError: Direct buffer memory
        at java.nio.Bits.reserveMemory(Bits.java:693) ~[na:1.8.0_111]
        at java.nio.DirectByteBuffer.<init>(DirectByteBuffer.java:123) 
~[na:1.8.0_111]
        at java.nio.ByteBuffer.allocateDirect(ByteBuffer.java:311) 
~[na:1.8.0_111]
        at 
org.apache.cassandra.utils.memory.BufferPool.allocate(BufferPool.java:109) 
~[apache-cassandra-3.9.jar:3.9]
        at 
org.apache.cassandra.utils.memory.BufferPool.access$1000(BufferPool.java:46) 
~[apache-cassandra-3.9.jar:3.9]
        at 
org.apache.cassandra.utils.memory.BufferPool$LocalPool.allocate(BufferPool.java:406)
 ~[apache-cassandra-3.9.jar:3.9]
        at 
org.apache.cassandra.utils.memory.BufferPool$LocalPool.access$000(BufferPool.java:333)
 ~[apache-cassandra-3.9.jar:3.9]
        at 
org.apache.cassandra.utils.memory.BufferPool.takeFromPool(BufferPool.java:121) 
~[apache-cassandra-3.9.jar:3.9]
        at org.apache.cassandra.utils.memory.BufferPool.get(BufferPool.java:93) 
~[apache-cassandra-3.9.jar:3.9]
        at org.apache.cassandra.cache.ChunkCache.load(ChunkCache.java:156) 
~[apache-cassandra-3.9.jar:3.9]
        at org.apache.cassandra.cache.ChunkCache.load(ChunkCache.java:40) 
~[apache-cassandra-3.9.jar:3.9]
        at 
com.github.benmanes.caffeine.cache.BoundedLocalCache$BoundedLocalLoadingCache.lambda$new$0(BoundedLocalCache.java:2949)
 ~[caffeine-2.2.6.jar:na]
        at 
com.github.benmanes.caffeine.cache.BoundedLocalCache.lambda$doComputeIfAbsent$15(BoundedLocalCache.java:1807)
 ~[caffeine-2.2.6.jar:na]
        at 
java.util.concurrent.ConcurrentHashMap.compute(ConcurrentHashMap.java:1892) 
~[na:1.8.0_111]
        at 
com.github.benmanes.caffeine.cache.BoundedLocalCache.doComputeIfAbsent(BoundedLocalCache.java:1805)
 ~[caffeine-2.2.6.jar:na]
        at 
com.github.benmanes.caffeine.cache.BoundedLocalCache.computeIfAbsent(BoundedLocalCache.java:1788)
 ~[caffeine-2.2.6.jar:na]
        at 
com.github.benmanes.caffeine.cache.LocalCache.computeIfAbsent(LocalCache.java:97)
 ~[caffeine-2.2.6.jar:na]
        at 
com.github.benmanes.caffeine.cache.LocalLoadingCache.get(LocalLoadingCache.java:66)
 ~[caffeine-2.2.6.jar:na]
        at 
org.apache.cassandra.cache.ChunkCache$CachingRebufferer.rebuffer(ChunkCache.java:236)
 ~[apache-cassandra-3.9.jar:3.9]
        at 
org.apache.cassandra.cache.ChunkCache$CachingRebufferer.rebuffer(ChunkCache.java:214)
 ~[apache-cassandra-3.9.jar:3.9]
        at 
org.apache.cassandra.io.util.RandomAccessReader.reBufferAt(RandomAccessReader.java:78)
 ~[apache-cassandra-3.9.jar:3.9]
        at 
org.apache.cassandra.io.util.RandomAccessReader.seek(RandomAccessReader.java:220)
 ~[apache-cassandra-3.9.jar:3.9]
        at 
org.apache.cassandra.io.util.SegmentedFile.createReader(SegmentedFile.java:138) 
~[apache-cassandra-3.9.jar:3.9]
        at 
org.apache.cassandra.io.sstable.format.SSTableReader.getFileDataInput(SSTableReader.java:1709)
 ~[apache-cassandra-3.9.jar:3.9]
        at 
org.apache.cassandra.db.columniterator.AbstractSSTableIterator.<init>(AbstractSSTableIterator.java:102)
 ~[apache-cassandra-3.9.jar:3.9]
        at 
org.apache.cassandra.db.columniterator.SSTableIterator.<init>(SSTableIterator.java:49)
 ~[apache-cassandra-3.9.jar:3.9]
        at 
org.apache.cassandra.io.sstable.format.big.BigTableReader.iterator(BigTableReader.java:72)
 ~[apache-cassandra-3.9.jar:3.9]
        at 
org.apache.cassandra.io.sstable.format.big.BigTableReader.iterator(BigTableReader.java:65)
 ~[apache-cassandra-3.9.jar:3.9]
        at 
org.apache.cassandra.db.rows.UnfilteredRowIteratorWithLowerBound.initializeIterator(UnfilteredRowIteratorWithLowerBound.java:105)
 ~[apache-cassandra-3.9.jar:3.9]
        at 
org.apache.cassandra.db.rows.LazilyInitializedUnfilteredRowIterator.maybeInit(LazilyInitializedUnfilteredRowIterator.java:48)
 ~[apache-cassandra-3.9.jar:3.9]
        at 
org.apache.cassandra.db.rows.LazilyInitializedUnfilteredRowIterator.partitionLevelDeletion(LazilyInitializedUnfilteredRowIterator.java:81)
 ~[apache-cassandra-3.9.jar:3.9]
        at 
org.apache.cassandra.db.rows.UnfilteredRowIteratorWithLowerBound.partitionLevelDeletion(UnfilteredRowIteratorWithLowerBound.java:165)
 ~[apache-cassandra-3.9.jar:3.9]
        at 
org.apache.cassandra.db.SinglePartitionReadCommand.queryMemtableAndDiskInternal(SinglePartitionReadCommand.java:585)
 ~[apache-cassandra-3.9.jar:3.9]
        at 
org.apache.cassandra.db.SinglePartitionReadCommand.queryMemtableAndDisk(SinglePartitionReadCommand.java:492)
 ~[apache-cassandra-3.9.jar:3.9]
        at 
org.apache.cassandra.db.SinglePartitionReadCommand.queryStorage(SinglePartitionReadCommand.java:358)
 ~[apache-cassandra-3.9.jar:3.9]
        at 
org.apache.cassandra.db.ReadCommand.executeLocally(ReadCommand.java:397) 
~[apache-cassandra-3.9.jar:3.9]
        at 
org.apache.cassandra.db.ReadCommandVerbHandler.doVerb(ReadCommandVerbHandler.java:48)
 ~[apache-cassandra-3.9.jar:3.9]
        at 
org.apache.cassandra.net.MessageDeliveryTask.run(MessageDeliveryTask.java:64) 
~[apache-cassandra-3.9.jar:3.9]
        at 
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) 
~[na:1.8.0_111]
        at 
org.apache.cassandra.concurrent.AbstractLocalAwareExecutorService$FutureTask.run(AbstractLocalAwareExecutorService.java:164)
 ~[apache-cassandra-3.9.jar:3.9]
        at 
org.apache.cassandra.concurrent.AbstractLocalAwareExecutorService$LocalSessionFutureTask.run(AbstractLocalAwareExecutorService.java:136)
 [apache-cassandra-3.9.jar:3.9]
        at org.apache.cassandra.concurrent.SEPWorker.run(SEPWorker.java:109) 
[apache-cassandra-3.9.jar:3.9]
        at java.lang.Thread.run(Thread.java:745) [na:1.8.0_111]
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