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From "Lu Ming" <xl...@live.com>
Subject High CPU Usage since 0.6.2
Date Fri, 04 Jun 2010 04:55:53 GMT

 I have ten 0.5.1 Cassandra nodes in my cluster, and I update them to 
cassandra to 0.6.2 yesterday.
 But today I find six cassandra nodes have high CPU usage more than 400% in 
my 8-core CPU sever.
 The worst one is more than 760%. It is very serious.

 I use jvisualvm to watch the worst node, and I found that there are many 
running threads named "thread-xxx"
 the status of other threads is waiting and sleeping.

"Thread-130" - Thread t@240
   java.lang.Thread.State: RUNNABLE
	at sun.misc.Unsafe.setMemory(Native Method)
	at sun.nio.ch.Util.erase(Util.java:202)
	at 
sun.nio.ch.FileChannelImpl.transferFromArbitraryChannel(FileChannelImpl.java:560)
	at sun.nio.ch.FileChannelImpl.transferFrom(FileChannelImpl.java:603)
	at 
org.apache.cassandra.streaming.IncomingStreamReader.read(IncomingStreamReader.java:62)
	at 
org.apache.cassandra.net.IncomingTcpConnection.run(IncomingTcpConnection.java:66)
   Locked ownable synchronizers:
	- None

"Thread-126" - Thread t@236
   java.lang.Thread.State: RUNNABLE
	at sun.nio.ch.FileDispatcher.read0(Native Method)
	at sun.nio.ch.SocketDispatcher.read(SocketDispatcher.java:21)
	at sun.nio.ch.IOUtil.readIntoNativeBuffer(IOUtil.java:233)
	at sun.nio.ch.IOUtil.read(IOUtil.java:200)
	at sun.nio.ch.SocketChannelImpl.read(SocketChannelImpl.java:236)
	- locked java.lang.Object@10808561
	at 
sun.nio.ch.FileChannelImpl.transferFromArbitraryChannel(FileChannelImpl.java:565)
	at sun.nio.ch.FileChannelImpl.transferFrom(FileChannelImpl.java:603)
	at 
org.apache.cassandra.streaming.IncomingStreamReader.read(IncomingStreamReader.java:62)
	at 
org.apache.cassandra.net.IncomingTcpConnection.run(IncomingTcpConnection.java:66)

   Locked ownable synchronizers:
	- None

"Thread-119" - Thread t@229
   java.lang.Thread.State: RUNNABLE
	at sun.nio.ch.NativeThread.current(Native Method)
	at sun.nio.ch.SocketChannelImpl.read(SocketChannelImpl.java:182)
	- locked java.lang.Object@65b4abbd
	- locked java.lang.Object@38773975
	at 
sun.nio.ch.FileChannelImpl.transferFromArbitraryChannel(FileChannelImpl.java:565)
	at sun.nio.ch.FileChannelImpl.transferFrom(FileChannelImpl.java:603)
	at 
org.apache.cassandra.streaming.IncomingStreamReader.read(IncomingStreamReader.java:62)
	at 
org.apache.cassandra.net.IncomingTcpConnection.run(IncomingTcpConnection.java:66)

   Locked ownable synchronizers:
	- None

 


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