RPC call times out while indexing map task is computing splits
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Key: NUTCH-195
URL: http://issues.apache.org/jira/browse/NUTCH-195
Project: Nutch
Type: Bug
Components: indexer
Versions: 0.8-dev
Environment: MapReduce multi-computer crawl environment: 11 machines (1 master
with JobTracker/NameNode, 10 slaves with TaskTrackers/DataNodes)
Reporter: Chris Schneider
We've been using Nutch 0.8 (MapReduce) to perform some internet crawling.
Things seemed to be going well until...
060129 222409 Lost tracker 'tracker_56288'
060129 222409 Task 'task_m_10gs5f' has been lost.
060129 222409 Task 'task_m_10qhzr' has been lost.
........
........
060129 222409 Task 'task_r_zggbwu' has been lost.
060129 222409 Task 'task_r_zh8dao' has been lost.
060129 222455 Server handler 8 on 8010 caught: java.net.SocketException: Socket
closed
java.net.SocketException: Socket closed
at java.net.SocketOutputStream.socketWrite(SocketOutputStream.java:99)
at java.net.SocketOutputStream.write(SocketOutputStream.java:136)
at
java.io.BufferedOutputStream.flushBuffer(BufferedOutputStream.java:65)
at java.io.BufferedOutputStream.flush(BufferedOutputStream.java:123)
at java.io.DataOutputStream.flush(DataOutputStream.java:106)
at org.apache.nutch.ipc.Server$Handler.run(Server.java:216)
060129 222455 Adding task 'task_m_cia5po' to set for tracker 'tracker_56288'
060129 223711 Adding task 'task_m_ffv59i' to set for tracker 'tracker_25647'
I'm hoping that someone could explain why task_m_cia5po got added to
tracker_56288 after this tracker was lost.
The Crawl .main process died with the following output:
060129 221129 Indexer: adding segment:
/user/crawler/crawl-20060129091444/segments/20060129200246
Exception in thread "main" java.io.IOException: timed out waiting for response
at org.apache.nutch.ipc.Client.call(Client.java:296)
at org.apache.nutch.ipc.RPC$Invoker.invoke(RPC.java:127)
at $Proxy1.submitJob(Unknown Source)
at org.apache.nutch.mapred.JobClient.submitJob(JobClient.java:259)
at org.apache.nutch.mapred.JobClient.runJob(JobClient.java:288)
at org.apache.nutch.indexer.Indexer.index(Indexer.java:263)
at org.apache.nutch.crawl.Crawl.main(Crawl.java:127)
However, it definitely seems as if the JobTracker is still waiting for the job
to finish (no failed jobs).
Doug Cutting's response:
The bug here is that the RPC call times out while the map task is computing
splits. The fix is that the job tracker should not compute splits until after
it has returned from the submitJob RPC. Please submit a bug in Jira to help
remind us to fix this.
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