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From "Rick Branson (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CASSANDRA-9258) Range movement causes CPU & performance impact
Date Tue, 28 Apr 2015 21:34:07 GMT
Rick Branson created CASSANDRA-9258:
---------------------------------------

             Summary: Range movement causes CPU & performance impact
                 Key: CASSANDRA-9258
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-9258
             Project: Cassandra
          Issue Type: Bug
         Environment: Cassandra 2.1.4
            Reporter: Rick Branson


Observing big CPU & latency regressions when doing range movements on clusters with many
tens of thousands of vnodes. See CPU usage increase by ~80% when a single node is being replaced.

Top methods are:

1) Ljava/math/BigInteger;.compareTo in Lorg/apache/cassandra/dht/ComparableObjectToken;.compareTo

2) Lcom/google/common/collect/AbstractMapBasedMultimap;.wrapCollection in Lcom/google/common/collect/AbstractMapBasedMultimap$AsMap$AsMapIterator;.next
3) Lorg/apache/cassandra/db/DecoratedKey;.compareTo in Lorg/apache/cassandra/dht/Range;.contains

Here's a sample stack from a thread dump:

"Thrift:50673" daemon prio=10 tid=0x00007f2f20164800 nid=0x3a04af runnable [0x00007f2d878d0000]
   java.lang.Thread.State: RUNNABLE
      at org.apache.cassandra.dht.Range.isWrapAround(Range.java:260)
      at org.apache.cassandra.dht.Range.contains(Range.java:51)
      at org.apache.cassandra.dht.Range.contains(Range.java:110)
      at org.apache.cassandra.locator.TokenMetadata.pendingEndpointsFor(TokenMetadata.java:916)
      at org.apache.cassandra.service.StorageProxy.performWrite(StorageProxy.java:775)
      at org.apache.cassandra.service.StorageProxy.mutate(StorageProxy.java:541)
      at org.apache.cassandra.service.StorageProxy.mutateWithTriggers(StorageProxy.java:616)
      at org.apache.cassandra.thrift.CassandraServer.doInsert(CassandraServer.java:1101)
      at org.apache.cassandra.thrift.CassandraServer.doInsert(CassandraServer.java:1083)
      at org.apache.cassandra.thrift.CassandraServer.batch_mutate(CassandraServer.java:976)
      at org.apache.cassandra.thrift.Cassandra$Processor$batch_mutate.getResult(Cassandra.java:3996)
      at org.apache.cassandra.thrift.Cassandra$Processor$batch_mutate.getResult(Cassandra.java:3980)
      at org.apache.thrift.ProcessFunction.process(ProcessFunction.java:39)
      at org.apache.thrift.TBaseProcessor.process(TBaseProcessor.java:39)
      at org.apache.cassandra.thrift.CustomTThreadPoolServer$WorkerProcess.run(CustomTThreadPoolServer.java:205)
      at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
      at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
      at java.lang.Thread.run(Thread.java:745)



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