我正在尝试将1百万个LUBM数据集加载到Cassandra中。但是，我在大约200,000个插入后继续获得此异常。
线程“main”中的异常com.datastax.driver.core.exceptions.NoHostAvailableException：尝试查询的所有主机都失败了（尝试过：localhost / 127.0.0.1（com.datastax.driver.core.exceptions.DriverException） ：读取期间超时））
服务器仍然存在。我仍然可以使用Datastax Dev Center执行CQL查询。在此之前，我得到了WriteTimeoutException，因此我在.yaml
中调整了一些选项以下是我系统的规格：
CPU- Intel I5 - 2核心| 内存 - 4GB | 硬盘 - 500 GB 4驱动器。
我有一个OWL文件，从中读取数据并插入到Cassandra中。我有混合的工作量。有时，根据条件，我需要从行中检索数据并将新数据附加到它并将其写入同一行。这不应该是导致此问题的原因，因为在200k插入期间必须发生这种情况很多次。
我正在使用外部硬盘来存储commitlog。 concurrent_reads设置为16。 concurrent_writes设置为32。 read_timeout已设置为10000，因此设置为write_timeout。 MAX_HEAP_SIZE = “2G” HEAP_NEWSIZE = “200M”
一旦我遇到帽子异常，我就会看到这个模式的日志
INFO [MemoryMeter:1] 2014-03-25 16:28:56,498 Memtable.java (line 449) CFS(Keyspace='rdf', ColumnFamily='lubm1m.lubm1m_teacherof_idx') liveRatio is 15.733535462912831 (just-counted was 15.733535462912831). calculation took 91ms for 665 cells
INFO [MemoryMeter:1] 2014-03-25 16:30:01,560 Memtable.java (line 449) CFS(Keyspace='system', ColumnFamily='sstable_activity') liveRatio is 15.896188158961882 (just-counted was 15.896188158961882). calculation took 37ms for 411 cells
INFO [ScheduledTasks:1] 2014-03-25 16:33:22,252 GCInspector.java (line 116) GC for ParNew: 15581 ms for 1 collections, 395151608 used; max is 1038876672
INFO [ScheduledTasks:1] 2014-03-25 16:33:24,894 StatusLogger.java (line 55) Pool Name Active Pending Completed Blocked All Time Blocked
INFO [ScheduledTasks:1] 2014-03-25 16:33:26,956 StatusLogger.java (line 70) ReadStage 0 0 343094 0 0
INFO [ScheduledTasks:1] 2014-03-25 16:33:26,957 StatusLogger.java (line 70) RequestResponseStage 0 0 1 0 0
INFO [ScheduledTasks:1] 2014-03-25 16:33:26,996 StatusLogger.java (line 70) ReadRepairStage 0 0 0 0 0
INFO [ScheduledTasks:1] 2014-03-25 16:33:27,004 StatusLogger.java (line 70) MutationStage 0 0 601747 0 0
INFO [ScheduledTasks:1] 2014-03-25 16:33:27,024 StatusLogger.java (line 70) ReplicateOnWriteStage 0 0 0 0 0
INFO [ScheduledTasks:1] 2014-03-25 16:33:27,031 StatusLogger.java (line 70) GossipStage 0 0 0 0 0
INFO [ScheduledTasks:1] 2014-03-25 16:33:27,066 StatusLogger.java (line 70) AntiEntropyStage 0 0 0 0 0
INFO [ScheduledTasks:1] 2014-03-25 16:33:27,067 StatusLogger.java (line 70) MigrationStage 0 0 0 0 0
INFO [ScheduledTasks:1] 2014-03-25 16:33:27,098 StatusLogger.java (line 70) MemtablePostFlusher 0 0 52 0 0
INFO [ScheduledTasks:1] 2014-03-25 16:33:27,099 StatusLogger.java (line 70) MemoryMeter 0 0 139 0 0
INFO [ScheduledTasks:1] 2014-03-25 16:33:27,100 StatusLogger.java (line 70) FlushWriter 0 0 31 0 16
INFO [ScheduledTasks:1] 2014-03-25 16:33:27,101 StatusLogger.java (line 70) MiscStage 0 0 0 0 0
INFO [ScheduledTasks:1] 2014-03-25 16:33:27,130 StatusLogger.java (line 70) PendingRangeCalculator 0 0 1 0 0
INFO [ScheduledTasks:1] 2014-03-25 16:33:27,133 StatusLogger.java (line 70) commitlog_archiver 0 0 0 0 0
INFO [ScheduledTasks:1] 2014-03-25 16:33:27,134 StatusLogger.java (line 70) InternalResponseStage 0 0 0 0 0
INFO [ScheduledTasks:1] 2014-03-25 16:33:27,142 StatusLogger.java (line 70) HintedHandoff 0 0 0 0 0
INFO [ScheduledTasks:1] 2014-03-25 16:33:27,223 StatusLogger.java (line 79) CompactionManager 0 0
INFO [ScheduledTasks:1] 2014-03-25 16:33:27,232 StatusLogger.java (line 81) Commitlog n/a 0
INFO [ScheduledTasks:1] 2014-03-25 16:33:27,262 StatusLogger.java (line 93) MessagingService n/a 0/0
INFO [ScheduledTasks:1] 2014-03-25 16:33:27,262 StatusLogger.java (line 103) Cache Type Size Capacity KeysToSave
INFO [ScheduledTasks:1] 2014-03-25 16:33:27,287 StatusLogger.java (line 105) KeyCache 17212 51380224 all
INFO [ScheduledTasks:1] 2014-03-25 16:33:27,335 StatusLogger.java (line 111) RowCache 0 0 all
INFO [ScheduledTasks:1] 2014-03-25 16:33:27,336 StatusLogger.java (line 118) ColumnFamily Memtable ops,data
INFO [ScheduledTasks:1] 2014-03-25 16:33:27,336 StatusLogger.java (line 121) system.schema_triggers 0,0
INFO [ScheduledTasks:1] 2014-03-25 16:33:27,337 StatusLogger.java (line 121) system.local 0,0
INFO [ScheduledTasks:1] 2014-03-25 16:33:27,337 StatusLogger.java (line 121) system.peers 0,0
INFO [ScheduledTasks:1] 2014-03-25 16:33:27,338 StatusLogger.java (line 121) system.batchlog 0,0
INFO [ScheduledTasks:1] 2014-03-25 16:33:27,338 StatusLogger.java (line 121) system.NodeIdInfo 0,0
INFO [ScheduledTasks:1] 2014-03-25 16:33:27,339 StatusLogger.java (line 121) system.compactions_in_progress 0,0
INFO [ScheduledTasks:1] 2014-03-25 16:33:27,339 StatusLogger.java (line 121) system.schema_keyspaces 4,1130
INFO [ScheduledTasks:1] 2014-03-25 16:33:27,340 StatusLogger.java (line 121) system.compaction_history 38,11220
INFO [ScheduledTasks:1] 2014-03-25 16:33:27,340 StatusLogger.java (line 121) system.paxos 0,0
INFO [ScheduledTasks:1] 2014-03-25 16:33:27,340 StatusLogger.java (line 121) system.schema_columns 3361,891818
INFO [ScheduledTasks:1] 2014-03-25 16:33:27,341 StatusLogger.java (line 121) system.schema_columnfamilies 1426,394018
INFO [ScheduledTasks:1] 2014-03-25 16:33:27,341 StatusLogger.java (line 121) system.IndexInfo 0,0
INFO [ScheduledTasks:1] 2014-03-25 16:33:27,342 StatusLogger.java (line 121) system.range_xfers 0,0
INFO [ScheduledTasks:1] 2014-03-25 16:33:27,344 StatusLogger.java (line 121) system.peer_events 0,0
INFO [ScheduledTasks:1] 2014-03-25 16:33:27,344 StatusLogger.java (line 121) system.hints 0,0
INFO [ScheduledTasks:1] 2014-03-25 16:33:27,345 StatusLogger.java (line 121) system.sstable_activity 1542,196000
INFO [ScheduledTasks:1] 2014-03-25 16:33:27,345 StatusLogger.java (line 121) KeyspaceCumulus.POS_RN_NUM 0,0
INFO [ScheduledTasks:1] 2014-03-25 16:33:27,346 StatusLogger.java (line 121) KeyspaceCumulus.DICT_SO_REVERSE 0,0
INFO [ScheduledTasks:1] 2014-03-25 16:33:27,346 StatusLogger.java (line 121) KeyspaceCumulus.SPO_RN_DT 0,0
INFO [ScheduledTasks:1] 2014-03-25 16:33:27,347 StatusLogger.java (line 121) KeyspaceCumulus.DICT_P_REVERSE 0,0
INFO [ScheduledTasks:1] 2014-03-25 16:33:27,347 StatusLogger.java (line 121) KeyspaceCumulus.SPOC 0,0
INFO [ScheduledTasks:1] 2014-03-25 16:33:27,348 StatusLogger.java (line 121) KeyspaceCumulus.POSC 0,0
INFO [ScheduledTasks:1] 2014-03-25 16:33:27,348 StatusLogger.java (line 121) KeyspaceCumulus.counter 0,0
INFO [ScheduledTasks:1] 2014-03-25 16:33:27,349 StatusLogger.java (line 121) KeyspaceCumulus.SCHEMA_O_PROPS 0,0
INFO [ScheduledTasks:1] 2014-03-25 16:33:27,350 StatusLogger.java (line 121) KeyspaceCumulus.SCHEMA_D_PROPS 0,0
INFO [ScheduledTasks:1] 2014-03-25 16:33:27,350 StatusLogger.java (line 121) KeyspaceCumulus.PREFIX_TO_NS 0,0
INFO [ScheduledTasks:1] 2014-03-25 16:33:27,352 StatusLogger.java (line 121) KeyspaceCumulus.POS_RN_DT 0,0
INFO [ScheduledTasks:1] 2014-03-25 16:33:27,352 StatusLogger.java (line 121) KeyspaceCumulus.SPO_RN_NUM 0,0
INFO [ScheduledTasks:1] 2014-03-25 16:33:27,353 StatusLogger.java (line 121) KeyspaceCumulus.SCHEMA_CLASSES 0,0
INFO [ScheduledTasks:1] 2014-03-25 16:33:27,353 StatusLogger.java (line 121) KeyspaceCumulus.OSPC 0,0
INFO [ScheduledTasks:1] 2014-03-25 16:33:27,354 StatusLogger.java (line 121) KeyspaceCumulus.DICT_SO 0,0
INFO [ScheduledTasks:1] 2014-03-25 16:33:27,354 StatusLogger.java (line 121) KeyspaceCumulus.DICT_P 0,0
INFO [ScheduledTasks:1] 2014-03-25 16:33:27,355 StatusLogger.java (line 121) rdf.animal 0,0
INFO [ScheduledTasks:1] 2014-03-25 16:33:27,355 StatusLogger.java (line 121) rdf.lubm20 0,0
INFO [ScheduledTasks:1] 2014-03-25 16:33:27,356 StatusLogger.java (line 121) rdf.bsbm50 0,0
INFO [ScheduledTasks:1] 2014-03-25 16:33:27,356 StatusLogger.java (line 121) rdf.tim 0,0
INFO [ScheduledTasks:1] 2014-03-25 16:33:27,357 StatusLogger.java (line 121) rdf.bsbm250 0,0
INFO [ScheduledTasks:1] 2014-03-25 16:33:27,357 StatusLogger.java (line 121) rdf.lubm1m 152700,22140112
INFO [ScheduledTasks:1] 2014-03-25 16:33:27,358 StatusLogger.java (line 121) rdf.lubm3 0,0
INFO [ScheduledTasks:1] 2014-03-25 16:33:27,358 StatusLogger.java (line 121) system_traces.sessions 0,0
INFO [ScheduledTasks:1] 2014-03-25 16:33:27,359 StatusLogger.java (line 121) system_traces.events 0,0
可能是什么问题？
答案 0 :(得分：1)
使用SocketOptions增加套接字超时。您也可以尝试在datastax客户端和服务器端配置它。另外，看看降低一致性是否有任何帮助？
-Vivek