Exceptions in tasktracker

[felix gao <gr...@gmail.com>]

Hi all,

I am combing through the tasktracker logs and I found many exceptions traces
in the log.  I am wondering if anyone with experience can help me eliminate
it.
Thanks,

Felix

1) Exception in thread "Timer thread for monitoring jvm"
java.lang.IllegalArgumentException: unresolved address

	at java.net.DatagramPacket.setSocketAddress(DatagramPacket.java:295)
	at java.net.DatagramPacket.<init>(DatagramPacket.java:123)
	at java.net.DatagramPacket.<init>(DatagramPacket.java:158)
	at org.apache.hadoop.metrics.ganglia.GangliaContext31.emitMetric(GangliaContext31.java:118)
	at org.apache.hadoop.metrics.ganglia.GangliaContext.emitRecord(GangliaContext.java:127)
	at org.apache.hadoop.metrics.spi.AbstractMetricsContext.emitRecords(AbstractMetricsContext.java:313)
	at org.apache.hadoop.metrics.spi.AbstractMetricsContext.timerEvent(AbstractMetricsContext.java:299)
	at org.apache.hadoop.metrics.spi.AbstractMetricsContext.access$000(AbstractMetricsContext.java:53)
	at org.apache.hadoop.metrics.spi.AbstractMetricsContext$1.run(AbstractMetricsContext.java:258)
	at java.util.TimerThread.mainLoop(Timer.java:512)
	at java.util.TimerThread.run(Timer.java:462)



2）

2011-10-28 00:01:19,787 WARN org.apache.hadoop.mapred.TaskTracker:
getMapOutput(attempt_201110131522_7830_m_001320_0,41) failed :
org.mortbay.jetty.EofException
	at org.mortbay.jetty.HttpGenerator.flush(HttpGenerator.java:787)
	at org.mortbay.jetty.AbstractGenerator$Output.flush(AbstractGenerator.java:566)
	at org.mortbay.jetty.HttpConnection$Output.flush(HttpConnection.java:946)
	at org.mortbay.jetty.AbstractGenerator$Output.write(AbstractGenerator.java:646)
	at org.mortbay.jetty.AbstractGenerator$Output.write(AbstractGenerator.java:577)
	at org.apache.hadoop.mapred.TaskTracker$MapOutputServlet.doGet(TaskTracker.java:2947)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:707)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
	at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:502)
	at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:363)
	at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
	at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181)
	at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:766)
	at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:417)
	at org.mortbay.jetty.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:230)
	at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
	at org.mortbay.jetty.Server.handle(Server.java:324)
	at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:534)
	at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:864)
	at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:533)
	at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:207)
	at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:403)
	at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:409)
	at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:522)
Caused by: java.io.IOException: Connection reset by peer
	at sun.nio.ch.FileDispatcher.write0(Native Method)
	at sun.nio.ch.SocketDispatcher.write(SocketDispatcher.java:29)
	at sun.nio.ch.IOUtil.writeFromNativeBuffer(IOUtil.java:100)
	at sun.nio.ch.IOUtil.write(IOUtil.java:71)
	at sun.nio.ch.SocketChannelImpl.write(SocketChannelImpl.java:334)
	at org.mortbay.io.nio.ChannelEndPoint.flush(ChannelEndPoint.java:169)
	at org.mortbay.io.nio.SelectChannelEndPoint.flush(SelectChannelEndPoint.java:221)
	at org.mortbay.jetty.HttpGenerator.flush(HttpGenerator.java:721)
	... 23 more


3）

2011-10-28 01:10:49,989 ERROR org.mortbay.log: /mapOutput
java.lang.IllegalStateException: Committed
	at org.mortbay.jetty.Response.resetBuffer(Response.java:994)
	at org.mortbay.jetty.Response.sendError(Response.java:240)
	at org.apache.hadoop.mapred.TaskTracker$MapOutputServlet.doGet(TaskTracker.java:2970)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:707)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
	at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:502)
	at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:363)
	at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
	at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181)
	at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:766)
	at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:417)
	at org.mortbay.jetty.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:230)
	at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
	at org.mortbay.jetty.Server.handle(Server.java:324)
	at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:534)
	at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:864)
	at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:533)
	at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:207)
	at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:403)
	at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:409)
	at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:522)