The DFS errors might have been caused by http://issues.apache.org/jira/browse/HADOOP-4040
thanks, dhruba On Sat, Sep 6, 2008 at 6:59 AM, Devaraj Das <[EMAIL PROTECTED]> wrote: > These exceptions are apparently coming from the dfs side of things. Could > someone from the dfs side please look at these? > > > On 9/5/08 3:04 PM, "Espen Amble Kolstad" <[EMAIL PROTECTED]> wrote: > >> Hi, >> >> Thanks! >> The patch applies without change to hadoop-0.18.0, and should be >> included in a 0.18.1. >> >> However, I'm still seeing: >> in hadoop.log: >> 2008-09-05 11:13:54,805 WARN dfs.DFSClient - Exception while reading >> from blk_3428404120239503595_2664 of >> /user/trank/segments/20080905102650/crawl_generate/part-00010 from >> somehost:50010: java.io.IOException: Premeture EOF from in >> putStream >> >> in datanode.log: >> 2008-09-05 11:15:09,554 WARN dfs.DataNode - >> DatanodeRegistration(somehost:50010, >> storageID=DS-751763840-somehost-50010-1219931304453, infoPort=50075, >> ipcPort=50020):Got exception while serving >> blk_-4682098638573619471_2662 to >> /somehost: >> java.net.SocketTimeoutException: 480000 millis timeout while waiting >> for channel to be ready for write. ch : >> java.nio.channels.SocketChannel[connected local=/somehost:50010 >> remote=/somehost:45244] >> >> These entries in datanode.log happens a few minutes apart repeatedly. >> I've reduced # map-tasks so load on this node is below 1.0 with 5GB of >> free memory (so it's not resource starvation). >> >> Espen >> >> On Thu, Sep 4, 2008 at 3:33 PM, Devaraj Das <[EMAIL PROTECTED]> wrote: >>>> I started a profile of the reduce-task. I've attached the profiling output. >>>> It seems from the samples that ramManager.waitForDataToMerge() doesn't >>>> actually wait. >>>> Has anybody seen this behavior. >>> >>> This has been fixed in HADOOP-3940 >>> >>> >>> On 9/4/08 6:36 PM, "Espen Amble Kolstad" <[EMAIL PROTECTED]> wrote: >>> >>>> I have the same problem on our cluster. >>>> >>>> It seems the reducer-tasks are using all cpu, long before there's anything >>>> to >>>> shuffle. >>>> >>>> I started a profile of the reduce-task. I've attached the profiling output. >>>> It seems from the samples that ramManager.waitForDataToMerge() doesn't >>>> actually wait. >>>> Has anybody seen this behavior. >>>> >>>> Espen >>>> >>>> On Thursday 28 August 2008 06:11:42 wangxu wrote: >>>>> Hi,all >>>>> I am using hadoop-0.18.0-core.jar and nutch-2008-08-18_04-01-55.jar, >>>>> and running hadoop on one namenode and 4 slaves. >>>>> attached is my hadoop-site.xml, and I didn't change the file >>>>> hadoop-default.xml >>>>> >>>>> when data in segments are large,this kind of errors occure: >>>>> >>>>> java.io.IOException: Could not obtain block: blk_-2634319951074439134_1129 >>>>> file=/user/root/crawl_debug/segments/20080825053518/content/part-00002/data >>>>> at >>>>> org.apache.hadoop.dfs.DFSClient$DFSInputStream.chooseDataNode(DFSClient.jav >>>>> a:1462) at >>>>> org.apache.hadoop.dfs.DFSClient$DFSInputStream.blockSeekTo(DFSClient.java:1 >>>>> 312) at >>>>> org.apache.hadoop.dfs.DFSClient$DFSInputStream.read(DFSClient.java:1417) >>>>> at >>>>> java.io.DataInputStream.readFully(DataInputStream.java:178) >>>>> at >>>>> org.apache.hadoop.io.DataOutputBuffer$Buffer.write(DataOutputBuffer.java:64 >>>>> ) at >>>>> org.apache.hadoop.io.DataOutputBuffer.write(DataOutputBuffer.java:102) >>>>> at >>>>> org.apache.hadoop.io.SequenceFile$Reader.readBuffer(SequenceFile.java:1646) >>>>> at >>>>> org.apache.hadoop.io.SequenceFile$Reader.seekToCurrentValue(SequenceFile.ja >>>>> va:1712) at >>>>> org.apache.hadoop.io.SequenceFile$Reader.getCurrentValue(SequenceFile.java: >>>>> 1787) at >>>>> org.apache.hadoop.mapred.SequenceFileRecordReader.getCurrentValue(SequenceF >>>>> ileRecordReader.java:104) at >>>>> org.apache.hadoop.mapred.SequenceFileRecordReader.next(SequenceFileRecordRe >>>>> ader.java:79) at >>>>> org.apache.hadoop.mapred.join.WrappedRecordReader.next(WrappedRecordReader. >>>>> java:112) at >>>>> org.apache.hadoop.mapred.join.WrappedRecordReader.accept(WrappedRecordReade >>>>> r.java:130) at >>>>> org.apache.hadoop.mapred.join.CompositeRecordReader.fillJoinCollector(Compo >>>>> siteRecordReader.java:398) at >>>>> org.apache.hadoop.mapred.join.JoinRecordReader.next(JoinRecordReader.java:5 >>>>> 6) at >>>>> org.apache.hadoop.mapred.join.JoinRecordReader.next(JoinRecordReader.java:3 >>>>> 3) at >>>>> org.apache.hadoop.mapred.MapTask$TrackedRecordReader.next(MapTask.java:165) >>>>> at org.apache.hadoop.mapred.MapRunner.run(MapRunner.java:45) >>>>> at org.apache.hadoop.mapred.MapTask.run(MapTask.java:227) >>>>> at org.apache.hadoop.mapred.TaskTracker$Child.main(TaskTracker.java:2209) >>>>> >>>>> >>>>> how can I correct this? >>>>> thanks. >>>>> Xu >>>> >>> >>> >>> > > >
