cassandra非常高的CPU率
我正在使用Cassandra 3.0.5版，最近刚刚从3.0.4升级。
在非常低的CPU利用率100％的查询速度下。
看看wather，cpu几乎都被用户进程占用了：
打击是顶级-H信息（24 cpu核心机）：
top - 19:54:50 up 21 days, 3:06, 7 users, load average: 25.15, 26.44, 26.66
Tasks: 987 total, 29 running, 958 sleeping, 0 stopped, 0 zombie
Cpu(s): 98.7%us, 0.1%sy, 0.0%ni, 1.2%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Mem: 66068260k total, 61686668k used, 4381592k free, 423456k buffers
Swap: 50331640k total, 0k used, 50331640k free, 41947168k cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
51174 cassandr 20 0 42.7g 16g 3.2g R 96.7 26.1 90:42.09 java
51166 cassandr 20 0 42.7g 16g 3.2g R 95.1 26.1 82:13.11 java
51179 cassandr 20 0 42.7g 16g 3.2g R 93.8 26.1 93:40.75 java
51164 cassandr 20 0 42.7g 16g 3.2g R 92.8 26.1 75:29.43 java
51171 cassandr 20 0 42.7g 16g 3.2g R 92.5 26.1 91:06.15 java
51180 cassandr 20 0 42.7g 16g 3.2g R 90.2 26.1 94:27.94 java
51173 cassandr 20 0 42.7g 16g 3.2g R 89.9 26.1 86:18.13 java
51176 cassandr 20 0 42.7g 16g 3.2g R 89.5 26.1 93:53.24 java
51168 cassandr 20 0 42.7g 16g 3.2g R 87.3 26.1 83:39.00 java
51446 cassandr 20 0 42.7g 16g 3.2g R 86.6 26.1 96:57.18 java
51455 cassandr 20 0 42.7g 16g 3.2g R 85.6 26.1 68:25.76 java
51183 cassandr 20 0 42.7g 16g 3.2g R 82.7 26.1 93:11.25 java
51181 cassandr 20 0 42.7g 16g 3.2g R 82.0 26.1 93:10.51 java
51448 cassandr 20 0 42.7g 16g 3.2g R 81.0 26.1 94:01.51 java
51444 cassandr 20 0 42.7g 16g 3.2g R 79.7 26.1 95:20.24 java
51182 cassandr 20 0 42.7g 16g 3.2g R 79.4 26.1 92:09.21 java
51449 cassandr 20 0 42.7g 16g 3.2g R 78.8 26.1 93:27.02 java
51447 cassandr 20 0 42.7g 16g 3.2g R 78.4 26.1 91:46.38 java
51453 cassandr 20 0 42.7g 16g 3.2g R 77.1 26.1 87:55.30 java
51170 cassandr 20 0 42.7g 16g 3.2g R 75.2 26.1 86:45.33 java
51445 cassandr 20 0 42.7g 16g 3.2g R 73.5 26.1 95:42.81 java
51172 cassandr 20 0 42.7g 16g 3.2g R 73.2 26.1 90:37.34 java
51452 cassandr 20 0 42.7g 16g 3.2g R 72.9 26.1 94:18.97 java
51451 cassandr 20 0 42.7g 16g 3.2g R 72.2 26.1 92:12.47 java
51178 cassandr 20 0 42.7g 16g 3.2g R 71.2 26.1 93:16.02 java
51165 cassandr 20 0 42.7g 16g 3.2g R 69.6 26.1 79:04.09 java
51169 cassandr 20 0 42.7g 16g 3.2g R 66.7 26.1 78:41.26 java
51175 cassandr 20 0 42.7g 16g 3.2g R 63.1 26.1 94:24.96 java
51443 cassandr 20 0 42.7g 16g 3.2g S 53.9 26.1 93:11.98 java
然后从jstack看到线程信息：
"SharedPool-Worker-26" #301 daemon prio=5 os_prio=0 tid=0x00007ff8b83362e0 nid=0xc8f8 runnable [0x00007ff8867ef000]
java.lang.Thread.State: RUNNABLE
at org.apache.cassandra.db.transform.BaseRows.hasNext(BaseRows.java:110)
at org.apache.cassandra.index.internal.composites.CompositesSearcher$1.prepareNext(CompositesSearcher.java:130)
at org.apache.cassandra.index.internal.composites.CompositesSearcher$1.hasNext(CompositesSearcher.java:83)
at org.apache.cassandra.db.transform.BasePartitions.hasNext(BasePartitions.java:72)
at org.apache.cassandra.db.partitions.UnfilteredPartitionIterators$Serializer.serialize(UnfilteredPartitionIterators.java:295)
at org.apache.cassandra.db.ReadResponse$LocalDataResponse.build(ReadResponse.java:134)
at org.apache.cassandra.db.ReadResponse$LocalDataResponse.<init>(ReadResponse.java:127)
at org.apache.cassandra.db.ReadResponse$LocalDataResponse.<init>(ReadResponse.java:123)
at org.apache.cassandra.db.ReadResponse.createDataResponse(ReadResponse.java:65)
at org.apache.cassandra.db.ReadCommand.createResponse(ReadCommand.java:289)
at org.apache.cassandra.db.ReadCommandVerbHandler.doVerb(ReadCommandVerbHandler.java:47)
at org.apache.cassandra.net.MessageDeliveryTask.run(MessageDeliveryTask.java:67)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at org.apache.cassandra.concurrent.AbstractLocalAwareExecutorService$FutureTask.run(AbstractLocalAwareExecutorService.java:164)
at org.apache.cassandra.concurrent.AbstractLocalAwareExecutorService$LocalSessionFutureTask.run(AbstractLocalAwareExecutorService.java:136)
at org.apache.cassandra.concurrent.SEPWorker.run(SEPWorker.java:105)
at java.lang.Thread.run(Thread.java:745)
或者这个：
org.apache.cassandra.utils.MurmurHash.hash3_x64_128(MurmurHash.java:191)
org.apache.cassandra.dht.Murmur3Partitioner.getHash(Murmur3Partitioner.java:181)
org.apache.cassandra.dht.Murmur3Partitioner.decorateKey(Murmur3Partitioner.java:53)
org.apache.cassandra.db.PartitionPosition$ForKey.get(PartitionPosition.java:49)
org.apache.cassandra.db.marshal.PartitionerDefinedOrder.compareCustom(PartitionerDefinedOrder.java:93)
org.apache.cassandra.db.marshal.AbstractType.compare(AbstractType.java:158)
org.apache.cassandra.db.ClusteringComparator.compareComponent(ClusteringComparator.java:166)
org.apache.cassandra.db.ClusteringComparator.compare(ClusteringComparator.java:137)
org.apache.cassandra.db.ClusteringComparator.compare(ClusteringComparator.java:126)
org.apache.cassandra.db.ClusteringComparator.compare(ClusteringComparator.java:44)
org.apache.cassandra.utils.MergeIterator$Candidate.compareTo(MergeIterator.java:378)
org.apache.cassandra.utils.MergeIterator$ManyToOne.replaceAndSink(MergeIterator.java:266)
org.apache.cassandra.utils.MergeIterator$ManyToOne.advance(MergeIterator.java:189)
org.apache.cassandra.utils.MergeIterator$ManyToOne.computeNext(MergeIterator.java:158)
org.apache.cassandra.utils.AbstractIterator.hasNext(AbstractIterator.java:47)
org.apache.cassandra.db.rows.UnfilteredRowIterators$UnfilteredRowMergeIterator.computeNext(UnfilteredRowIterators.java:428)
org.apache.cassandra.db.rows.UnfilteredRowIterators$UnfilteredRowMergeIterator.computeNext(UnfilteredRowIterators.java:288)
org.apache.cassandra.utils.AbstractIterator.hasNext(AbstractIterator.java:47)
org.apache.cassandra.db.transform.BaseRows.hasNext(BaseRows.java:108)
org.apache.cassandra.index.internal.composites.CompositesSearcher$1.prepareNext(CompositesSearcher.java:130)
org.apache.cassandra.index.internal.composites.CompositesSearcher$1.hasNext(CompositesSearcher.java:83)
org.apache.cassandra.db.transform.BasePartitions.hasNext(BasePartitions.java:72)
org.apache.cassandra.db.partitions.UnfilteredPartitionIterators$Serializer.serialize(UnfilteredPartitionIterators.java:295)
org.apache.cassandra.db.ReadResponse$LocalDataResponse.build(ReadResponse.java:134)
org.apache.cassandra.db.ReadResponse$LocalDataResponse.<init>(ReadResponse.java:127)
org.apache.cassandra.db.ReadResponse$LocalDataResponse.<init>(ReadResponse.java:123)
org.apache.cassandra.db.ReadResponse.createDataResponse(ReadResponse.java:65)
org.apache.cassandra.db.ReadCommand.createResponse(ReadCommand.java:289)
org.apache.cassandra.db.ReadCommandVerbHandler.doVerb(ReadCommandVerbHandler.java:47)
org.apache.cassandra.net.MessageDeliveryTask.run(MessageDeliveryTask.java:67)
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
org.apache.cassandra.concurrent.AbstractLocalAwareExecutorService$FutureTask.run(AbstractLocalAwareExecutorService.java:164)
org.apache.cassandra.concurrent.AbstractLocalAwareExecutorService$LocalSessionFutureTask.run(AbstractLocalAwareExecutorService.java:136)
org.apache.cassandra.concurrent.SEPWorker.run(SEPWorker.java:105)
java.lang.Thread.run(Thread.java:745)
我发现繁忙的运行线程全部来自“SharedPool-Worker”。
它们都在org.apache.cassandra.db.transform.BaseRows.hasNext或比方法更深。
有人遇到过这个问题吗？这是一个错误吗？
1 个答案:
答案 0 :(得分：0)
不是cassandra问题，使用二级索引是我的错。 我在我的应用程序中发现了这个cql：SELECT * FROM userlabel where phone =''。 由于表“userlabel”中有许多空手机，这个cql会选出太多行，并且它们被编入索引。 它也可能是问题“查询第二索引时堆栈溢出”CASSANDRA-11304的主要原因，因为需要查询太多行，然后通过递归调用发生错误。
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