我正在使用最新的C* java driver提取20 GB的数据。 我有一个5节点C *集群。正在摄取数据的客户端应用程序正在不属于C *群集（但是属于同一LAN的一部分）的本地节点上运行。我也在我摄取的表上使用cassandra-lucene-index索引。 [cqlsh 5.0.1 | Cassandra 3.0.8 | CQL规范3.4.0 |原生协议v4]
我的Java客户端应用程序以下列方式工作：
executeAsync的C *集群[注意：有很多行正在发送] 大约一半时间，我的两个节点死亡，/var/log/cassandra/system.log显示
ERROR [CompactionExecutor:1] JVMStabilityInspector.java:140 - 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_91]
at java.nio.DirectByteBuffer.<init>(DirectByteBuffer.java:123) ~[na:1.8.0_91]
at java.nio.ByteBuffer.allocateDirect(ByteBuffer.java:311) ~[na:1.8.0_91]
at org.apache.cassandra.utils.memory.BufferPool.allocate(BufferPool.java:108) ~[apache-cassandra-3.0.8.jar:3.0.8]
at org.apache.cassandra.utils.memory.BufferPool.access$1000(BufferPool.java:45) ~[apache-cassandra-3.0.8.jar:3.0.8]
at org.apache.cassandra.utils.memory.BufferPool$LocalPool.allocate(BufferPool.java:387) ~[apache-cassandra-3.0.8.jar:3.0.8]
at org.apache.cassandra.utils.memory.BufferPool$LocalPool.access$000(BufferPool.java:314) ~[apache-cassandra-3.0.8.jar:3.0.8]
at org.apache.cassandra.utils.memory.BufferPool.takeFromPool(BufferPool.java:120) ~[apache-cassandra-3.0.8.jar:3.0.8]
at org.apache.cassandra.utils.memory.BufferPool.get(BufferPool.java:92) ~[apache-cassandra-3.0.8.jar:3.0.8]
at org.apache.cassandra.io.util.RandomAccessReader.allocateBuffer(RandomAccessReader.java:87) ~[apache-cassandra-3.0.8.jar:3.0.8]
at org.apache.cassandra.io.compress.CompressedRandomAccessReader.access$100(CompressedRandomAccessReader.java:38) ~[apache-cassandra-3.0.8.jar:3.0.8]
at org.apache.cassandra.io.compress.CompressedRandomAccessReader$Builder.createBuffer(CompressedRandomAccessReader.java:275) ~[apache-cassandra-3.0.8.jar:3.0.8]
at org.apache.cassandra.io.util.RandomAccessReader.<init>(RandomAccessReader.java:74) ~[apache-cassandra-3.0.8.jar:3.0.8]
at org.apache.cassandra.io.compress.CompressedRandomAccessReader.<init>(CompressedRandomAccessReader.java:59) ~[apache-cassandra-3.0.8.jar:3.0.8]
at org.apache.cassandra.io.compress.CompressedRandomAccessReader$Builder.build(CompressedRandomAccessReader.java:283) ~[apache-cassandra-3.0.8.jar:3.0.8]
at org.apache.cassandra.io.util.CompressedSegmentedFile.createReader(CompressedSegmentedFile.java:145) ~[apache-cassandra-3.0.8.jar:3.0.8]
at org.apache.cassandra.io.util.SegmentedFile.createReader(SegmentedFile.java:133) ~[apache-cassandra-3.0.8.jar:3.0.8]
at org.apache.cassandra.io.sstable.format.SSTableReader.getFileDataInput(SSTableReader.java:1711) ~[apache-cassandra-3.0.8.jar:3.0.8]
at org.apache.cassandra.db.columniterator.AbstractSSTableIterator.<init>(AbstractSSTableIterator.java:93) ~[apache-cassandra-3.0.8.jar:3.0.8]
at org.apache.cassandra.db.columniterator.SSTableIterator.<init>(SSTableIterator.java:46) ~[apache-cassandra-3.0.8.jar:3.0.8]
at org.apache.cassandra.db.columniterator.SSTableIterator.<init>(SSTableIterator.java:36) ~[apache-cassandra-3.0.8.jar:3.0.8]
at org.apache.cassandra.io.sstable.format.big.BigTableReader.iterator(BigTableReader.java:62) ~[apache-cassandra-3.0.8.jar:3.0.8]
at org.apache.cassandra.db.SinglePartitionReadCommand.queryMemtableAndDiskInternal(SinglePartitionReadCommand.java:580) ~[apache-cassandra-3.0.8.jar:3.0.8]
at org.apache.cassandra.db.SinglePartitionReadCommand.queryMemtableAndDisk(SinglePartitionReadCommand.java:492) ~[apache-cassandra-3.0.8.jar:3.0.8]
at com.stratio.cassandra.lucene.IndexService.read(IndexService.java:618) ~[cassandra-lucene-index-plugin-3.0.8.0.jar:na]
at com.stratio.cassandra.lucene.IndexWriterWide.finish(IndexWriterWide.java:89) ~[cassandra-lucene-index-plugin-3.0.8.0.jar:na]
at org.apache.cassandra.index.SecondaryIndexManager$IndexGCTransaction.commit(SecondaryIndexManager.java:958) ~[apache-cassandra-3.0.8.jar:3.0.8]
at org.apache.cassandra.db.compaction.CompactionIterator$1$1.onMergedRows(CompactionIterator.java:197) ~[apache-cassandra-3.0.8.jar:3.0.8]
at org.apache.cassandra.db.rows.UnfilteredRowIterators$UnfilteredRowMergeIterator$MergeReducer.getReduced(UnfilteredRowIterators.java:484) ~[apache-cassandra-3.0.8.jar:3.0.8]
at org.apache.cassandra.db.rows.UnfilteredRowIterators$UnfilteredRowMergeIterator$MergeReducer.getReduced(UnfilteredRowIterators.java:446) ~[apache-cassandra-3.0.8.jar:3.0.8]
at org.apache.cassandra.utils.MergeIterator$ManyToOne.consume(MergeIterator.java:220) ~[apache-cassandra-3.0.8.jar:3.0.8]
at org.apache.cassandra.utils.MergeIterator$ManyToOne.computeNext(MergeIterator.java:159) ~[apache-cassandra-3.0.8.jar:3.0.8]
at org.apache.cassandra.utils.AbstractIterator.hasNext(AbstractIterator.java:47) ~[apache-cassandra-3.0.8.jar:3.0.8]
at org.apache.cassandra.db.rows.UnfilteredRowIterators$UnfilteredRowMergeIterator.computeNext(UnfilteredRowIterators.java:428) ~[apache-cassandra-3.0.8.jar:3.0.8]
at org.apache.cassandra.db.rows.UnfilteredRowIterators$UnfilteredRowMergeIterator.computeNext(UnfilteredRowIterators.java:288) ~[apache-cassandra-3.0.8.jar:3.0.8]
at org.apache.cassandra.utils.AbstractIterator.hasNext(AbstractIterator.java:47) ~[apache-cassandra-3.0.8.jar:3.0.8]
at org.apache.cassandra.db.transform.BaseRows.hasNext(BaseRows.java:128) ~[apache-cassandra-3.0.8.jar:3.0.8]
at org.apache.cassandra.db.ColumnIndex$Builder.build(ColumnIndex.java:111) ~[apache-cassandra-3.0.8.jar:3.0.8]
at org.apache.cassandra.db.ColumnIndex.writeAndBuildIndex(ColumnIndex.java:52) ~[apache-cassandra-3.0.8.jar:3.0.8]
at org.apache.cassandra.io.sstable.format.big.BigTableWriter.append(BigTableWriter.java:149) ~[apache-cassandra-3.0.8.jar:3.0.8]
at org.apache.cassandra.io.sstable.SSTableRewriter.append(SSTableRewriter.java:125) ~[apache-cassandra-3.0.8.jar:3.0.8]
at org.apache.cassandra.db.compaction.writers.DefaultCompactionWriter.realAppend(DefaultCompactionWriter.java:57) ~[apache-cassandra-3.0.8.jar:3.0.8]
at org.apache.cassandra.db.compaction.writers.CompactionAwareWriter.append(CompactionAwareWriter.java:109) ~[apache-cassandra-3.0.8.jar:3.0.8]
at org.apache.cassandra.db.compaction.CompactionTask.runMayThrow(CompactionTask.java:182) ~[apache-cassandra-3.0.8.jar:3.0.8]
at org.apache.cassandra.utils.WrappedRunnable.run(WrappedRunnable.java:28) ~[apache-cassandra-3.0.8.jar:3.0.8]
at org.apache.cassandra.db.compaction.CompactionTask.executeInternal(CompactionTask.java:78) ~[apache-cassandra-3.0.8.jar:3.0.8]
at org.apache.cassandra.db.compaction.AbstractCompactionTask.execute(AbstractCompactionTask.java:60) ~[apache-cassandra-3.0.8.jar:3.0.8]
at org.apache.cassandra.db.compaction.CompactionManager$BackgroundCompactionCandidate.run(CompactionManager.java:263) ~[apache-cassandra-3.0.8.jar:3.0.8]
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) ~[na:1.8.0_91]
at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[na:1.8.0_91]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) ~[na:1.8.0_91]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [na:1.8.0_91]
at java.lang.Thread.run(Thread.java:745) [na:1.8.0_91]
当我尝试重新启动两个节点时，会发生同样的异常。然后我决定调整MAX_HEAP_SIZE中的HEAP_NEWSIZE和cassandra-env.sh，但节点只会耗尽所有可用内存，然后再次死亡。我有一个82gb的ram节点和一个48gb的ram死了。我为4G, 8G, 24G尝试了MAX_HEAP_SIZE，为800M, 2G尝试了HEAP_NEWSIZE，但他们无法重启。
system.log文件还显示堆的转储：
Heap dump file created
INFO [CompactionExecutor:1] 2016-08-14 13:43:44,223 HeapUtils.java:136 -
num #instances #bytes class name
----------------------------------------------
1: 20879 2883199896 [I
2: 5228765 334640960 org.apache.cassandra.utils.btree.BTreeSearchIterator
3: 1836788 196567272 [B
4: 3625993 163640704 [Ljava.lang.Object;
5: 1260125 60486000 java.nio.HeapByteBuffer
6: 1686322 53962304 org.apache.cassandra.utils.MergeIterator$Candidate
7: 412664 52984560 [C
8: 965525 38621000 org.apache.cassandra.db.rows.BufferCell
9: 1511370 36272880 java.util.ArrayList
10: 768459 30738360 org.apache.cassandra.db.rows.BTreeRow$Builder
11: 382981 30638480 org.apache.cassandra.io.compress.CompressedRandomAccessReader
12: 848641 27156512 java.util.RandomAccessSubList
13: 848467 27150944 java.util.AbstractList$ListItr
14: 394468 25245952 java.nio.DirectByteBuffer
15: 387495 24799680 java.nio.DirectByteBufferR
16: 774559 24785888 org.apache.cassandra.utils.btree.BTree$Builder
17: 382823 24500672 org.apache.cassandra.db.columniterator.SSTableIterator$ForwardIndexedReader
18: 486500 23352000 org.apache.cassandra.db.columniterator.SSTableIterator
19: 383067 21451752 org.apache.cassandra.db.ClusteringPrefix$Deserializer
20: 667956 21374592 org.apache.cassandra.db.rows.BTreeRow
21: 853186 20476464 java.util.Arrays$ArrayList
22: 848462 20363088 java.util.SubList$1
23: 486689 19467560 org.apache.cassandra.db.rows.SerializationHelper
24: 486319 19452760 org.apache.cassandra.db.filter.ClusteringIndexNamesFilter$1
25: 383067 18387216 org.apache.cassandra.db.UnfilteredDeserializer$CurrentDeserializer
26: 404602 16184080 org.apache.cassandra.utils.MergeIterator$ManyToOne
27: 487237 15591584 java.util.TreeMap$KeyIterator
28: 382823 15312920 org.apache.cassandra.db.columniterator.AbstractSSTableIterator$IndexState
29: 376176 15047040 sun.misc.Cleaner
30: 469635 15028320 org.apache.cassandra.db.rows.EncodingStats
31: 464757 14872224 com.google.common.collect.Iterators$11
32: 404602 13837016 [Lorg.apache.cassandra.utils.MergeIterator$Candidate;
33: 550947 13222728 java.lang.Long
34: 404502 12598432 [Lorg.apache.cassandra.db.rows.Row;
35: 768640 12298240 org.apache.cassandra.db.rows.BTreeRow$Builder$CellResolver
36: 375337 12010784 java.nio.DirectByteBuffer$Deallocator
37: 250019 10000760 org.apache.cassandra.db.rows.Row$Merger
38: 250019 10000760 org.apache.cassandra.db.rows.Row$Merger$ColumnDataReducer
39: 312161 9989152 com.google.common.collect.RegularImmutableList
40: 154609 9894976 org.apache.cassandra.db.SinglePartitionReadCommand
41: 383092 9194208 org.apache.cassandra.cache.KeyCacheKey
42: 275673 8821536 java.util.ArrayList$Itr
43: 155947 8733032 java.util.LinkedHashMap
44: 344055 8257320 java.lang.Double
45: 157837 7576176 java.util.TreeMap
46: 314112 7538688 com.google.common.collect.Iterators$12
47: 302346 7256304 com.google.common.collect.Collections2$TransformedCollection
48: 125865 7048440 java.util.stream.ReferencePipeline$Head
49: 125057 7003192 org.apache.cassandra.db.rows.UnfilteredRowIterators$UnfilteredRowMergeIterator
50: 154483 6179320 com.stratio.cassandra.lucene.IndexWriterWide
51: 383788 6140608 java.util.zip.CRC32
52: 377473 6039568 java.lang.Integer
53: 250019 6000456 org.apache.cassandra.db.rows.Row$Merger$CellReducer
54: 236029 5844680 [Ljava.nio.ByteBuffer;
55: 231113 5546712 java.lang.String
56: 230392 5529408 org.apache.cassandra.db.Clustering
57: 125057 5002280 org.apache.cassandra.db.rows.RangeTombstoneMarker$Merger
58: 154949 4958368 org.apache.cassandra.db.filter.ColumnFilter
59: 309592 4953472 com.google.common.collect.Iterables$3
60: 154483 4943456 [Lorg.apache.cassandra.db.rows.ColumnData;
61: 154483 4943456 [Lorg.apache.cassandra.db.rows.Row$Builder;
62: 154483 4943456 org.apache.cassandra.db.rows.Rows$1
63: 179483 4307592 com.google.common.collect.Iterators$5
64: 8055 4213168 [J
65: 125114 4003648 java.util.ArrayList$ArrayListSpliterator
66: 125057 4001824 org.apache.cassandra.db.rows.UnfilteredRowIterators$UnfilteredRowMergeIterator$MergeReducer
67: 125060 3828904 [Lorg.apache.cassandra.db.DeletionTime;
68: 125057 3828808 [Lorg.apache.cassandra.db.rows.RangeTombstoneMarker;
69: 157055 3769320 com.google.common.collect.Iterables$2
70: 155783 3738792 org.apache.cassandra.utils.Interval
71: 154722 3713328 org.apache.cassandra.db.rows.ComplexColumnData
72: 154677 3712248 org.apache.cassandra.db.filter.ClusteringIndexNamesFilter
73: 154483 3707592 org.apache.cassandra.index.SecondaryIndexManager$IndexGCTransaction$1
74: 150356 3608544 org.apache.cassandra.db.Columns
75: 70425 3380400 [Lorg.apache.cassandra.db.ClusteringPrefix$Kind;
76: 124989 2999736 org.apache.cassandra.db.rows.ComplexColumnData$Builder
77: 124971 2999304 java.util.stream.MatchOps$$Lambda$105/1652649396
78: 124971 2999304 java.util.stream.MatchOps$1MatchSink
79: 124971 2999304 java.util.stream.MatchOps$MatchOp
80: 173871 2781936 org.apache.cassandra.db.rows.CellPath$CollectionCellPath
81: 155081 2481296 java.util.TreeMap$KeySet
82: 154648 2474368 java.util.TreeSet
83: 154482 2471712 com.stratio.cassandra.lucene.IndexWriterWide$$Lambda$146/22703726
84: 16388 2228768 com.googlecode.concurrentlinkedhashmap.ConcurrentLinkedHashMap$PaddedAtomicReference
85: 54841 1754912 java.util.HashMap$Node
86: 36123 1444920 sun.nio.cs.UTF_8$Decoder
87: 35748 1429920 org.apache.cassandra.io.sstable.IndexHelper$IndexInfo
88: 34554 1382160 java.util.TreeMap$Entry
89: 11385 1126968 [Ljava.util.HashMap$Node;
90: 18124 1014944 sun.nio.cs.UTF_8$Encoder
91: 41388 993312 org.apache.cassandra.io.compress.CompressionMetadata$Chunk
92: 37722 905328 java.lang.StringBuilder
93: 7306 814736 java.lang.Class
94: 8627 753872 [S
95: 15574 747552 java.util.HashMap
96: 14365 603008 [Ljava.lang.String;
97: 23530 564720 java.util.EnumMap$EntryIterator$Entry
98: 17382 556224 java.util.concurrent.ConcurrentHashMap$Node
99: 22728 545472 org.apache.cassandra.db.ColumnFamilyStore$ViewFragment
100: 6057 533016 java.lang.reflect.Method
101: 8908 498848 org.apache.cassandra.utils.memory.BufferPool$Chunk
102: 12317 450160 [Ljavax.management.ObjectName$Property;
103: 18124 434976 javax.management.ObjectName$Property
104: 10779 431160 java.util.LinkedHashMap$Entry
105: 16300 391200 org.apache.cassandra.utils.btree.BTree$$Lambda$19/816798571
106: 7827 375696 java.nio.HeapCharBuffer
107: 9190 367600 java.lang.ref.Finalizer
108: 16672 364336 [Ljava.lang.Class;
109: 7538 361824 org.apache.cassandra.io.compress.CompressedRandomAccessReader$Builder
110: 20623 329968 org.apache.cassandra.db.lifecycle.View$$Lambda$46/610085529
111: 7491 299640 java.util.HashMap$KeyIterator
112: 4551 291264 java.net.URL
113: 9087 290784 sun.nio.fs.UnixPath
114: 517 272976 [Lorg.apache.lucene.util.fst.FST$Arc;
115: 7784 249088 java.io.File
116: 3366 242352 java.lang.reflect.Field
117: 3783 242112 java.util.regex.Matcher
118: 4323 242088 java.util.zip.ZipFile$ZipFileInputStream
119: 4322 242032 java.util.zip.ZipFile$ZipFileInflaterInputStream
120: 9545 229080 java.util.concurrent.ConcurrentLinkedQueue$Node
121: 9525 228600 com.google.common.collect.Iterators$8
122: 14037 224592 java.lang.Object
123: 3456 221184 io.netty.buffer.PoolSubpage
124: 8942 214608 java.util.concurrent.CopyOnWriteArrayList$COWIterator
125: 6702 214464 java.lang.StackTraceElement
126: 2917 210024 org.apache.lucene.util.fst.FST$Arc
127: 5119 204760 javax.management.MBeanPermission
128: 6281 200992 java.io.FilePermission
129: 4867 194680 javax.management.ObjectName
130: 7807 187368 org.apache.cassandra.dht.Murmur3Partitioner$LongToken
131: 7603 182472 org.apache.cassandra.io.util.MmappedRegions$Region
132: 5624 179968 org.apache.cassandra.cql3.ColumnIdentifier
133: 4330 173200 java.util.HashMap$ValueIterator
134: 2901 162456 jdk.internal.org.objectweb.asm.Item
135: 6604 158496 [Lorg.apache.cassandra.dht.Range;
136: 6506 156152 [Ljava.security.ProtectionDomain;
137: 1508 144768 java.util.jar.JarFile$JarFileEntry
138: 323 140560 [Ljava.util.concurrent.ConcurrentHashMap$Node;
139: 2143 137152 org.apache.lucene.store.ByteBufferIndexInput$SingleBufferImpl
140: 5708 136992 org.apache.cassandra.dht.Token$KeyBound
141: 4196 134272 org.apache.cassandra.db.rows.BTreeRow$$Lambda$140/1296076467
142: 5445 130680 com.google.common.collect.Iterators$PeekingImpl
143: 3990 127680 com.codahale.metrics.LongAdder
144: 2273 127288 org.apache.cassandra.db.RowUpdateBuilder
145: 1460 116800 java.util.zip.ZipEntry
146: 4843 116232 java.util.concurrent.ConcurrentSkipListMap$Node
147: 4837 116088 com.sun.jmx.mbeanserver.StandardMBeanSupport
148: 3616 115712 java.util.Collections$UnmodifiableMap
149: 4514 108336 org.apache.lucene.util.BytesRef
150: 1931 108136 javax.management.MBeanServerNotification
151: 2654 106160 java.security.AccessControlContext
152: 4320 103680 com.sun.jmx.mbeanserver.NamedObject
153: 4311 103464 org.apache.cassandra.utils.btree.BTree$FiltrationTracker
154: 4295 103080 org.apache.cassandra.utils.Pair
155: 6259 100144 java.io.FilePermission$1
156: 2044 98112 org.apache.lucene.index.FieldInfo
157: 2003 96144 org.antlr.runtime.CommonToken
158: 106 95840 [Ljdk.internal.org.objectweb.asm.Item;
159: 2902 92864 org.apache.cassandra.db.CBuilder$ArrayBackedBuilder
160: 1022 89936 org.apache.lucene.codecs.blocktree.FieldReader
161: 2779 88928 java.util.EnumMap$EntryIterator
162: 5557 88912 [Lorg.apache.cassandra.db.Clustering;
163: 2197 87880 org.apache.cassandra.utils.concurrent.Ref$State
164: 908 87168 org.apache.lucene.codecs.lucene54.Lucene54DocValuesProducer$NumericEntry
165: 1785 85680 com.codahale.metrics.EWMA
166: 2063 82520 java.util.WeakHashMap$Entry
167: 2470 81824 [Ljava.lang.reflect.Method;
168: 2017 80680 java.util.HashMap$EntryIterator
169: 3226 77424 java.io.ExpiringCache$Entry
170: 875 77416 [Ljava.lang.StackTraceElement;
171: 455 77408 [Z
172: 2412 77184 java.io.FileDescriptor
173: 3216 77184 java.util.concurrent.ConcurrentLinkedDeque$Node
174: 2300 73600 com.google.common.collect.Iterators$7
175: 1022 73584 org.apache.lucene.util.fst.FST
176: 2283 73056 org.apache.lucene.util.WeakIdentityMap$IdentityWeakReference
177: 3036 72864 org.apache.cassandra.db.LivenessInfo
178: 2857 71792 [Lorg.yaml.snakeyaml.tokens.Token$ID;
179: 1774 70960 java.util.Formatter$FormatSpecifier
180: 1102 70528 sun.nio.ch.FileChannelImpl
181: 4393 70288 java.util.HashMap$KeySet
182: 2189 70048 org.apache.cassandra.metrics.CassandraMetricsRegistry$MetricName
183: 2886 69264 java.net.URLClassLoader$1
184: 2871 68904 org.apache.cassandra.db.DeletionTime
185: 2853 68472 org.apache.cassandra.dht.Range
186: 164 68224 [Lorg.antlr.runtime.BitSet;
187: 1694 67760 java.lang.ref.SoftReference
188: 128 67584 [Lcom.googlecode.concurrentlinkedhashmap.ConcurrentLinkedHashMap$PaddedAtomicReference;
189: 4196 67136 org.apache.cassandra.db.Columns$$Lambda$139/703415756
190: 4175 66800 com.google.common.collect.Iterators$3
191: 3938 63008 java.util.HashSet
192: 2599 62376 com.google.common.collect.ImmutableEntry
193: 1526 61040 org.apache.cassandra.db.PreHashedDecoratedKey
194: 1891 60512 java.net.InetAddress$InetAddressHolder
195: 3780 60480 com.stratio.cassandra.lucene.IndexWriterWide$$Lambda$149/2109187587
196: 924 59136 java.util.concurrent.ConcurrentHashMap
197: 1457 58280 java.lang.ClassNotFoundException
198: 2411 57864 java.lang.StringBuffer
199: 1797 57504 java.util.TreeMap$EntryIterator
200: 1412 56480 java.util.EnumMap
201: 2349 56376 java.util.Date
202: 1563 56072 [Ljava.util.Formatter$Flags;
203: 1390 55600 java.util.ArrayList$SubList$1
204: 868 55552 java.text.DecimalFormatSymbols
205: 1384 55360 org.yaml.snakeyaml.error.Mark
206: 686 54880 java.lang.reflect.Constructor
207: 1361 54440 java.util.ArrayList$SubList
208: 2267 54408 org.apache.cassandra.metrics.CassandraMetricsRegistry$JmxGauge
209: 2238 53712 sun.misc.ProxyGenerator$ConstantPool$IndirectEntry
210: 2197 52728 org.apache.cassandra.utils.concurrent.Ref
211: 2172 52128 java.util.Collections$1
212: 1615 51680 java.util.concurrent.locks.AbstractQueuedSynchronizer$Node
213: 2103 50472 org.apache.cassandra.db.lifecycle.View$$Lambda$66/2068475002
214: 3151 50416 java.util.HashMap$Values
215: 134 50384 java.lang.Thread
216: 272 50048 [Lorg.apache.cassandra.net.MessagingService$Verb;
217: 2042 49008 javax.management.ObjectInstance
218: 1225 49000 java.lang.invoke.MethodType
219: 61 48776 [D
220: 2005 48120 java.util.Formatter$FixedString
221: 1490 47680 java.security.CodeSource
222: 569 47184 [Ljava.util.WeakHashMap$Entry;
223: 208 46592 jdk.internal.org.objectweb.asm.MethodWriter
224: 827 46312 java.lang.invoke.MemberName
225: 1447 46304 sun.misc.URLClassPath$JarLoader$2
226: 1916 45984 java.util.concurrent.atomic.AtomicLong
227: 1896 45504 java.lang.Class$MethodArray
228: 1886 45264 java.net.Inet4Address
229: 1845 44280 javax.management.MBeanTrustPermission
230: 1830 43920 [Lorg.apache.lucene.util.packed.PackedInts$Format;
231: 1339 42848 java.lang.invoke.MethodType$ConcurrentWeakInternSet$WeakEntry
232: 655 41920 java.util.stream.ReferencePipeline$3
233: 1734 41616 com.google.common.collect.Iterables$6
234: 2578 41248 com.sun.jmx.interceptor.DefaultMBeanServerInterceptor$1
235: 2560 40960 com.google.common.collect.Maps$6
236: 1022 40880 org.apache.lucene.util.fst.BytesStore
237: 842 40416 org.apache.cassandra.metrics.CassandraMetricsRegistry$JmxTimer
238: 1253 40096 java.lang.ref.ReferenceQueue
239: 703 39368 java.util.concurrent.ConcurrentHashMap$EntryIterator
240: 264 38016 com.googlecode.concurrentlinkedhashmap.ConcurrentLinkedHashMap$PaddedAtomicLong
241: 1539 36936 org.apache.lucene.util.fst.ReverseBytesReader
242: 655 36680 java.lang.Class$ReflectionData
243: 648 36288 java.util.concurrent.ConcurrentHashMap$KeyIterator
244: 2111 33776 java.util.concurrent.atomic.AtomicInteger
245: 421 33680 org.apache.cassandra.db.rows.RowAndDeletionMergeIterator
246: 2092 33472 org.apache.cassandra.utils.concurrent.Refs
247: 1022 32704 org.apache.lucene.store.ByteArrayDataInput
248: 1358 32592 org.apache.cassandra.gms.GossipDigest
249: 789 31560 sun.nio.ch.FileChannelImpl$Unmapper
250: 656 31488 java.util.StringTokenizer
...
3851: 1 16 sun.util.locale.provider.SPILocaleProviderAdapter
3852: 1 16 sun.util.resources.LocaleData
3853: 1 16 sun.util.resources.LocaleData$LocaleDataResourceBundleControl
Total 41014224 4650350712
如何让它们重新开始？
我觉得他们试图重新构建一些排队的插入，因为我只是从我的客户端“垃圾”插入了writeAsync，而cassandra最终被插入的数量所淹没？
下次我提取数据时如何防止这种情况发生？
答案 0 :(得分：1)
这是由于Java的较早版本（1.8.102和1.9.104之前的版本）对此没有限制而导致对堆缓冲区使用过多的内存引起的：https://support.datastax.com/hc/en-us/articles/360000863663-JVM-OOM-direct-buffer-errors-affected-by-unlimited-java-nio-cache
尝试升级到较新的Java并添加：
-Djdk.nio.maxCachedBufferSize=1048576
到cassandra-env.sh或jvm.options。