Cassandra服务器抛出java.lang.AssertionError：DecoratedKey（…）！= DecoratedKey

我目前正在与Cassandra进行实验。

在客户端（和Hector）我查找了几个这样的键： 

ColumnFamilyResult<String, String> result = template.queryColumns(Arrays.asList("key1","key2","key3"));

大部分时间似乎工作。 但其他时间，我在客户端上得到超时exception： 

 Caused by: me.prettyprint.hector.api.exceptions.HTimedOutException: TimedOutException() at me.prettyprint.cassandra.service.ExceptionsTranslatorImpl.translate(ExceptionsTranslatorImpl.java:35) at me.prettyprint.cassandra.service.template.ThriftColumnFamilyTemplate$1.execute(ThriftColumnFamilyTemplate.java:100) at me.prettyprint.cassandra.service.template.ThriftColumnFamilyTemplate$1.execute(ThriftColumnFamilyTemplate.java:88) at me.prettyprint.cassandra.service.Operation.executeAndSetResult(Operation.java:103) at me.prettyprint.cassandra.connection.HConnectionManager.operateWithFailover(HConnectionManager.java:258) at me.prettyprint.cassandra.model.ExecutingKeyspace.doExecuteOperation(ExecutingKeyspace.java:97) at me.prettyprint.cassandra.service.template.ThriftColumnFamilyTemplate.sliceInternal(ThriftColumnFamilyTemplate.java:88) at me.prettyprint.cassandra.service.template.ThriftColumnFamilyTemplate.doExecuteSlice(ThriftColumnFamilyTemplate.java:46) at me.prettyprint.cassandra.service.template.ColumnFamilyTemplate.queryColumns(ColumnFamilyTemplate.java:113) at info.gamlor.experiments.Cassandra.readObjectByKey(ComplexCassandra.java:255) Caused by: TimedOutException() at org.apache.cassandra.thrift.Cassandra$get_slice_result.read(Cassandra.java:7772) at org.apache.cassandra.thrift.Cassandra$Client.recv_get_slice(Cassandra.java:570) at org.apache.cassandra.thrift.Cassandra$Client.get_slice(Cassandra.java:542) at me.prettyprint.cassandra.service.template.ThriftColumnFamilyTemplate$1.execute(ThriftColumnFamilyTemplate.java:95)

在服务器上出现这个exception： 

 ERROR 11:33:55,312 Exception in thread Thread[ReadStage:91,5,main] java.lang.AssertionError: DecoratedKey(4948402862350542345439897754126541659, 6932) != DecoratedKey(132475956107784875457507977471906551877, 726f6f74) in C:\tem p\cassandra\lib\cassandra\data\CassandraPolepos\ComplexObjects\CassandraPolepos-ComplexObjects-hd-2-Data.db at org.apache.cassandra.db.columniterator.SSTableSliceIterator.<init>(SSTableSliceIterator.java:58) at org.apache.cassandra.db.filter.SliceQueryFilter.getSSTableColumnIterator(SliceQueryFilter.java:66) at org.apache.cassandra.db.filter.QueryFilter.getSSTableColumnIterator(QueryFilter.java:78) at org.apache.cassandra.db.CollationController.collectAllData(CollationController.java:256) at org.apache.cassandra.db.CollationController.getTopLevelColumns(CollationController.java:63) at org.apache.cassandra.db.ColumnFamilyStore.getTopLevelColumns(ColumnFamilyStore.java:1331) at org.apache.cassandra.db.ColumnFamilyStore.getColumnFamily(ColumnFamilyStore.java:1193) at org.apache.cassandra.db.ColumnFamilyStore.getColumnFamily(ColumnFamilyStore.java:1128) at org.apache.cassandra.db.Table.getRow(Table.java:378) at org.apache.cassandra.db.SliceFromReadCommand.getRow(SliceFromReadCommand.java:69) at org.apache.cassandra.service.StorageProxy$LocalReadRunnable.runMayThrow(StorageProxy.java:816) at org.apache.cassandra.service.StorageProxy$DroppableRunnable.run(StorageProxy.java:1250) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603) at java.lang.Thread.run(Thread.java:722)

有时候DecoratedKey（…）部分的键值会占用页面。

任何人都暗示我做错了什么。 或者如何调查这个问题。

谢谢。

这是https://issues.apache.org/jira/browse/CASSANDRA-4687或https://issues.apache.org/jira/browse/CASSANDRA-5202你可以运行命令“nodetool invalidatekeycache”显示错误的服务器。 如果它不断回来，你可能想要禁用密钥caching。 如果是5202，则只能在使用相同名称删除并重新创build列族之后才发生。

对我来说，它看起来像一个错误。

随着更高版本（1.1.5）的错误消失。 至less对于我来说。

这看起来像https://issues.apache.org/jira/browse/CASSANDRA-4687 ，它尚未修复。 解决方法是禁用密钥caching。

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