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From "James Moore" <jamesthepi...@gmail.com>
Subject Read timed out, Abandoning block blk_-5476242061384228962
Date Wed, 07 May 2008 20:29:13 GMT
What is this bit of the log trying to tell me, and what sorts of
things should I be looking at to make sure it doesn't happen?

I don't think the network has any basic configuration issues - I can
telnet from the machine creating this log to the destination - telnet 50010 works fine when I ssh in to the box with this

2008-05-07 13:20:31,194 INFO org.apache.hadoop.dfs.DFSClient:
Exception in createBlockOutputStream java.net.SocketTimeoutException:
Read timed out
2008-05-07 13:20:31,194 INFO org.apache.hadoop.dfs.DFSClient:
Abandoning block blk_-5476242061384228962
2008-05-07 13:20:31,196 INFO org.apache.hadoop.dfs.DFSClient: Waiting
to find target node:

I'm seeing a fair number of these.  My reduces finally complete, but
there are usually a couple at the end that take longer than I think
they should, and they frequently have these sorts of errors.

I'm running 20 machines on ec2 right now, with hadoop version 0.16.4.
James Moore | james@restphone.com

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