我有6个cassandra节点，每个节点有6GB左右的数据，除了一个有大约45GB数据的节点。
这是因为这个节点保留了大约39GB的提示。
我的所有节点都启动并且功能齐全我知道为什么这个节点会保留很大的提示。
此节点被异常
杀死NFO [ScheduledTasks:1] 2015-08-18 03:07:28,941 StatusLogger.java (line 55) Pool Name Active Pending Completed Blocked All Time Blocked
INFO [ScheduledTasks:1] 2015-08-18 03:08:43,100 StatusLogger.java (line 70) ReadStage 2 2 24803657 0 0
INFO [ScheduledTasks:1] 2015-08-18 03:08:43,101 StatusLogger.java (line 70) RequestResponseStage 0 0 49288185 0 0
INFO [ScheduledTasks:1] 2015-08-18 03:08:43,101 StatusLogger.java (line 70) ReadRepairStage 0 0 2607139 0 0
INFO [ScheduledTasks:1] 2015-08-18 03:08:43,102 StatusLogger.java (line 70) MutationStage 2 12 15871730 0 0
INFO [ScheduledTasks:1] 2015-08-18 03:08:43,103 StatusLogger.java (line 70) ReplicateOnWriteStage 0 0 0 0 0
INFO [ScheduledTasks:1] 2015-08-18 03:08:43,103 StatusLogger.java (line 70) GossipStage 0 0 3318395 0 0
INFO [ScheduledTasks:1] 2015-08-18 03:08:43,104 StatusLogger.java (line 70) AntiEntropyStage 0 0 0 0 0
ERROR [ReadStage:398] 2015-08-18 03:08:43,104 CassandraDaemon.java (line 187) Exception in thread Thread[ReadStage:398,5,main]
java.lang.OutOfMemoryError: Java heap space
at org.apache.cassandra.io.util.RandomAccessReader.readBytes(RandomAccessReader.java:344)
at org.apache.cassandra.utils.ByteBufferUtil.read(ByteBufferUtil.java:392)
at org.apache.cassandra.utils.ByteBufferUtil.readWithLength(ByteBufferUtil.java:355)
at org.apache.cassandra.db.ColumnSerializer.deserializeColumnBody(ColumnSerializer.java:118)
at org.apache.cassandra.db.OnDiskAtom$Serializer.deserializeFromSSTable(OnDiskAtom.java:85)
at org.apache.cassandra.db.Column$1.computeNext(Column.java:75)
at org.apache.cassandra.db.Column$1.computeNext(Column.java:64)
at com.google.common.collect.AbstractIterator.tryToComputeNext(AbstractIterator.java:143)
at com.google.common.collect.AbstractIterator.hasNext(AbstractIterator.java:138)
at org.apache.cassandra.db.columniterator.SimpleSliceReader.computeNext(SimpleSliceReader.java:88)
at org.apache.cassandra.db.columniterator.SimpleSliceReader.computeNext(SimpleSliceReader.java:37)
at com.google.common.collect.AbstractIterator.tryToComputeNext(AbstractIterator.java:143)
at com.google.common.collect.AbstractIterator.hasNext(AbstractIterator.java:138)
at org.apache.cassandra.db.columniterator.SSTableSliceIterator.hasNext(SSTableSliceIterator.java:82)
at org.apache.cassandra.db.columniterator.LazyColumnIterator.computeNext(LazyColumnIterator.java:82)
at org.apache.cassandra.db.columniterator.LazyColumnIterator.computeNext(LazyColumnIterator.java:59)
at com.google.common.collect.AbstractIterator.tryToComputeNext(AbstractIterator.java:143)
at com.google.common.collect.AbstractIterator.hasNext(AbstractIterator.java:138)
at org.apache.cassandra.db.filter.QueryFilter$2.getNext(QueryFilter.java:157)
at org.apache.cassandra.db.filter.QueryFilter$2.hasNext(QueryFilter.java:140)
at org.apache.cassandra.utils.MergeIterator$Candidate.advance(MergeIterator.java:144)
at org.apache.cassandra.utils.MergeIterator$ManyToOne.advance(MergeIterator.java:123)
at org.apache.cassandra.utils.MergeIterator$ManyToOne.computeNext(MergeIterator.java:97)
at com.google.common.collect.AbstractIterator.tryToComputeNext(AbstractIterator.java:143)
at com.google.common.collect.AbstractIterator.hasNext(AbstractIterator.java:138)
at org.apache.cassandra.db.filter.SliceQueryFilter.collectReducedColumns(SliceQueryFilter.java:185)
at org.apache.cassandra.db.filter.QueryFilter.collateColumns(QueryFilter.java:122)
at org.apache.cassandra.db.filter.QueryFilter.collateOnDiskAtom(QueryFilter.java:80)
at org.apache.cassandra.db.RowIteratorFactory$2.getReduced(RowIteratorFactory.java:101)
at org.apache.cassandra.db.RowIteratorFactory$2.getReduced(RowIteratorFactory.java:75)
at org.apache.cassandra.utils.MergeIterator$ManyToOne.consume(MergeIterator.java:115)
at org.apache.cassandra.utils.MergeIterator$ManyToOne.computeNext(MergeIterator.java:98)
INFO [ScheduledTasks:1] 2015-08-18 03:08:43,105 StatusLogger.java (line 70) MigrationStage 0 0 32 0 0
INFO [ScheduledTasks:1] 2015-08-18 03:08:43,154 StatusLogger.java (line 70) MemtablePostFlusher 0 0 32691 0 0
INFO [ScheduledTasks:1] 2015-08-18 03:08:43,154 StatusLogger.java (line 70) MemoryMeter 0 0 371 0 0
INFO [
编辑：nodetool -h 172.xxx.xxx.x23 tpstats
s = -ea -javaagent:./../lib/jamm-0.2.5.jar -XX:+UseThreadPriorities -XX:ThreadPriorityPolicy=42 -Xms8G -Xmx8G -Xmn400M -XX:+HeapDumpOnOutOfMemoryError -Xss256k
Pool Name Active Pending Completed Blocked All time blocked
ReadStage 0 0 24426641 0 0
RequestResponseStage 0 0 48496365 0 0
MutationStage 0 0 15623599 0 0
ReadRepairStage 0 0 2562071 0 0
ReplicateOnWriteStage 0 0 0 0 0
GossipStage 0 0 3268659 0 0
AntiEntropyStage 0 0 0 0 0
MigrationStage 0 0 32 0 0
MemoryMeter 0 0 371 0 0
MemtablePostFlusher 0 0 32263 0 0
FlushWriter 0 0 18447 0 1080
MiscStage 0 0 0 0 0
PendingRangeCalculator 0 0 8 0 0
commitlog_archiver 0 0 0 0 0
InternalResponseStage 0 0 12 0 0
HintedHandoff 2 2 1194 0 0
Message type Dropped
RANGE_SLICE 0
READ_REPAIR 0
PAGED_RANGE 0
BINARY 0
READ 0
MUTATION 0
_TRACE 0
REQUEST_RESPONSE 0
修改
endpoint_snitch：GossipingPropertyFileSnitch。
CREATE KEYSPACE fbkeyspace_r2 WITH replication = {
'class': 'NetworkTopologyStrategy',
'DC1': '2',
'DC24': '2'
};
./ nodetool netstats
Mode: NORMAL
Not sending any streams.
Read Repair Statistics:
Attempted: 235114
Mismatch (Blocking): 0
Mismatch (Background): 20146
Pool Name Active Pending Completed
Commands n/a 0 4452633
Responses n/a 0 2603124
./ nodetool -h 172.xxx.xxx.80 netstats
Mode: NORMAL
Not sending any streams.
Read Repair Statistics:
Attempted: 30581744
Mismatch (Blocking): 0
Mismatch (Background): 2973864
Pool Name Active Pending Completed
Commands n/a 0 525946068
Responses n/a 0 526266474