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From Zhenyu Zhong <zhongresea...@gmail.com>
Subject regionserver disconnection
Date Wed, 11 Nov 2009 17:02:11 GMT
Hi,

I have been monitoring the system resources such as memory Heap usage for
Regionserver, load average, network bandwidth, etc.

I experienced a disconnection last night. When I checked the memory Heap for
Regionserver, it was 2336 which is way below the max Heap 4096. I don't
think it is Regionserver problem. The requests that the regionserver got was
about 126 which doesn't seem to be high. The load average is kind of high
>100. (but I saw disconnections while the load average is around 30). The
bandwidth is not a problem.

However, I found error messages from the zookeeper. Please see the following
error messages. There are some
BufferUnderflowException error, IOException error,etc.
May I ask what might be the causes that generate these error messages?

Many thanks
zhenyu


2009-11-11 04:29:00,810 WARN org.apache.zookeeper.server.Request: Ignoring
exception during toString
java.nio.BufferUnderflowException
        at java.nio.HeapByteBuffer.get(HeapByteBuffer.java:127)
        at java.nio.ByteBuffer.get(ByteBuffer.java:675)
        at org.apache.zookeeper.server.Request.toString(Request.java:199)
        at java.lang.String.valueOf(String.java:2827)
        at java.lang.StringBuilder.append(StringBuilder.java:115)
        at
org.apache.zookeeper.server.quorum.CommitProcessor.processRequest(CommitProcessor.java:167)
        at
org.apache.zookeeper.server.quorum.FollowerRequestProcessor.run(FollowerRequestProcessor.java:68)
2009-11-11 04:29:00,810 WARN org.apache.zookeeper.server.NIOServerCnxn:
Exception causing close of session 0x424dfd908c50009
due to java.io.IOException: Read error
2009-11-11 04:29:00,810 DEBUG org.apache.zookeeper.server.NIOServerCnxn:
IOException stack trace
java.io.IOException: Read error
        at
org.apache.zookeeper.server.NIOServerCnxn.doIO(NIOServerCnxn.java:372)
        at
org.apache.zookeeper.server.NIOServerCnxn$Factory.run(NIOServerCnxn.java:221)
2009-11-11 04:29:00,810 DEBUG
org.apache.zookeeper.server.quorum.CommitProcessor: Processing request::
sessionid:0x424dfd908c50009 type:setWatches cxid:0xfffffffffffffff8
zxid:0xfffffffffffffffe txntype:unknown n/a
2009-11-11 04:29:00,810 WARN org.apache.zookeeper.server.Request: Ignoring
exception during toString
java.nio.BufferUnderflowException
        at java.nio.HeapByteBuffer.get(HeapByteBuffer.java:127)
        at java.nio.ByteBuffer.get(ByteBuffer.java:675)
        at org.apache.zookeeper.server.Request.toString(Request.java:199)
        at java.lang.String.valueOf(String.java:2827)
        at java.lang.StringBuilder.append(StringBuilder.java:115)
        at
org.apache.zookeeper.server.FinalRequestProcessor.processRequest(FinalRequestProcessor.java:74)
        at
org.apache.zookeeper.server.quorum.CommitProcessor.run(CommitProcessor.java:73)
2009-11-11 04:29:00,810 DEBUG
org.apache.zookeeper.server.FinalRequestProcessor: Processing request::
sessionid:0x424dfd908c50009 type:setWatches cxid:0xfffffffffffffff8
zxid:0xfffffffffffffffe txntype:unknown n/a
2009-11-11 04:29:00,810 WARN org.apache.zookeeper.server.Request: Ignoring
exception during toString
java.nio.BufferUnderflowException
        at java.nio.HeapByteBuffer.get(HeapByteBuffer.java:127)
        at java.nio.ByteBuffer.get(ByteBuffer.java:675)
        at org.apache.zookeeper.server.Request.toString(Request.java:199)
        at
org.apache.log4j.or.DefaultRenderer.doRender(DefaultRenderer.java:36)
        at
org.apache.log4j.or.RendererMap.findAndRender(RendererMap.java:80)
        at
org.apache.log4j.spi.LoggingEvent.getRenderedMessage(LoggingEvent.java:362)
at
org.apache.log4j.helpers.PatternParser$BasicPatternConverter.convert(PatternParser.java:403)
        at
org.apache.log4j.helpers.PatternConverter.format(PatternConverter.java:65)
        at org.apache.log4j.PatternLayout.format(PatternLayout.java:502)
        at
org.apache.log4j.WriterAppender.subAppend(WriterAppender.java:302)
        at
org.apache.log4j.DailyRollingFileAppender.subAppend(DailyRollingFileAppender.java:359)
        at org.apache.log4j.WriterAppender.append(WriterAppender.java:160)
        at
org.apache.log4j.AppenderSkeleton.doAppend(AppenderSkeleton.java:251)
        at
org.apache.log4j.helpers.AppenderAttachableImpl.appendLoopOnAppenders(AppenderAttachableImpl.java:66)
        at org.apache.log4j.Category.callAppenders(Category.java:206)
        at org.apache.log4j.Category.forcedLog(Category.java:391)
        at org.apache.log4j.Category.debug(Category.java:260)
        at
org.apache.zookeeper.server.FinalRequestProcessor.processRequest(FinalRequestProcessor.java:147)
        at
org.apache.zookeeper.server.quorum.CommitProcessor.run(CommitProcessor.java:73)
2009-11-11 04:29:00,810 WARN org.apache.zookeeper.server.Request: Ignoring
exception during toString
sessionid:0x424dfd908c50009 type:setWatches cxid:0xfffffffffffffff8
zxid:0xfffffffffffffffe txntype:unknown n/a
2009-11-11 04:29:00,810 INFO org.apache.zookeeper.server.NIOServerCnxn:
closing session:0x424dfd908c50009 NIOServerCnxn:
java.nio.channels.SocketChannel[connected local=/192.168.100.131:2181remote=/
192.168.100.131:35500]
2009-11-11 04:29:00,810 DEBUG org.apache.zookeeper.server.NIOServerCnxn:
ignoring exception during input shutdown
java.net.SocketException: Transport endpoint is not connected
        at sun.nio.ch.SocketChannelImpl.shutdown(Native Method)
        at
sun.nio.ch.SocketChannelImpl.shutdownInput(SocketChannelImpl.java:640)
        at sun.nio.ch.SocketAdaptor.shutdownInput(SocketAdaptor.java:360)
        at
org.apache.zookeeper.server.NIOServerCnxn.close(NIOServerCnxn.java:848)
        at
org.apache.zookeeper.server.NIOServerCnxn.doIO(NIOServerCnxn.java:498)
        at
org.apache.zookeeper.server.NIOServerCnxn$Factory.run(NIOServerCnxn.java:221)

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