Please keep Cloudera issues off this list.
On Apr 13, 2011, at 12:22 PM, Eli Collins wrote:
Hey Ferdy,
If you're seeing this after bumping fs.datanode.max.xcievers and the
nfiles ulimit, and you're also seeing dropped packets it sounds like
you're having networking issues.
See the following as well:
https://groups.google.com/a/cloudera.org/group/cdh-user/browse_thread/thread/1d3a377bd605e1bd/d3d8ec0d14c065bb?
#d3d8ec0d14c065bb
Thanks,
Eli
On Tue, Apr 12, 2011 at 10:37 AM, Ferdy Galema <ferdy.gal...@kalooga.com
> wrote:
Hi,
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 pipeline.
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.
Ferdy.
