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我们已经在生产环境中运行 Cassandra 1.0.2 好几个月了,而且麻烦很少。最近,我们开始在所有节点中看到一致的故障,并出现以下错误:

ERROR [CompactionExecutor:199] 2013-03-02 00:21:26,179 AbstractCassandraDaemon.java (line 133) Fatal exception in thread Thread[CompactionExecutor:199,1,RMI Runtime]
java.io.IOError: java.io.IOException: Map failed
        at org.apache.cassandra.io.util.MmappedSegmentedFile$Builder.createSegments(MmappedSegmentedFile.java:225)
        at org.apache.cassandra.io.util.MmappedSegmentedFile$Builder.complete(MmappedSegmentedFile.java:202)
        at org.apache.cassandra.io.sstable.SSTableWriter.closeAndOpenReader(SSTableWriter.java:308)
        at org.apache.cassandra.db.compaction.CompactionTask.execute(CompactionTask.java:174)
        at org.apache.cassandra.db.compaction.CompactionManager$4.call(CompactionManager.java:275)
        at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
        at java.util.concurrent.FutureTask.run(FutureTask.java:138)
        at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
        at java.lang.Thread.run(Thread.java:619)
Caused by: java.io.IOException: Map failed
        at sun.nio.ch.FileChannelImpl.map(FileChannelImpl.java:758)
        at org.apache.cassandra.io.util.MmappedSegmentedFile$Builder.createSegments(MmappedSegmentedFile.java:217)
        ... 9 more
Caused by: java.lang.OutOfMemoryError: Map failed
        at sun.nio.ch.FileChannelImpl.map0(Native Method)
        at sun.nio.ch.FileChannelImpl.map(FileChannelImpl.java:755)
        ... 10 more
INFO [Thread-2] 2013-03-02 00:21:26,222 MessagingService.java (line 488) Shutting down MessageService...

节点在此之后死亡。我们删除最旧的数据文件并重新启动节点。该节点运行一段时间,然后再次死亡。这发生在我们环中的所有八个节点上。我们正在使用默认的压缩策略(大小分层),我们认为它是我们问题域的最佳选择。

问:为什么会发生这种情况,我们应该怎么做才能解决它?

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