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From Ferdy Galema <ferdy.gal...@kalooga.com>
Subject socket timeouts, dropped packages
Date Tue, 12 Apr 2011 17:37:40 GMT

We're running into issues were we are seeing timeouts when 
writing/reading a lot of hdfs data. (Hadoop is version CDH4B3 and hdfs 
appending is enabled). The type of exceptions vary a lot, but most of 
the times it's whenever a DFSClient writes data into the datanodes 

For example, one datanode logs "Exception in receiveBlock for block 
blk_5476601577216704980_62953994 java.io.EOFException: while trying to 
read 65557 bytes" and the other side logs "writeBlock 
blk_5476601577216704980_62953994 received exception 
java.net.SocketTimeoutException: Read timed out". That's it.

We cannot seem to determine the exact problem. The read timeout is 
default (60 sec). The open files limit and the number of xceivers is 
upped a lot. A full GC never takes longer than a second.

However, we are seeing a lot of dropped packages on the networking 
interface. Could these problems be related?

Any advice will be helpful.


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