59

我目前正在尝试使用 Cassandra。

在客户端（使用 Hector），我查找了如下几个键：

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

大多数时候它似乎工作。但其他时候我在客户端上遇到超时异常：

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)

在服务器上显示此异常：

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 DecoratedKey(...) 部分中的键值会占用页面。

任何人都暗示我做错了什么。或者如何调查这个问题。

谢谢。

4

3 回答 3

8

这是https://issues.apache.org/jira/browse/CASSANDRA-4687或https://issues.apache.org/jira/browse/CASSANDRA-5202 您可以在所有服务器显示错误。如果它不断出现，您可能需要禁用密钥缓存。如果是 5202，它应该只在使用相同名称删除并重新创建列族之后发生。

于 2013-03-26T23:25:09.923 回答
0

对我来说，它看起来像是一个错误。

使用更高版本（1.1.5），错误消失了。至少对我来说。

于 2012-11-19T15:48:50.027 回答
0

这看起来像https://issues.apache.org/jira/browse/CASSANDRA-4687，尚未修复。一种解决方法是禁用密钥缓存。

于 2013-02-15T14:55:22.093 回答