DataXceiver: java.io.IOException: Too many open files
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Key: HADOOP-3051
URL: https://issues.apache.org/jira/browse/HADOOP-3051
Project: Hadoop Core
Issue Type: Bug
Components: dfs
Affects Versions: 0.17.0
Reporter: André Martin
I just ran an experiment with the latest nightly build hadoop-2008-03-15
available and after 2 minutes I'm getting a tons of "java.io.IOException: Too
many open files" exceptions as shown here:
{noformat} 2008-03-19 20:08:09,303 ERROR org.apache.hadoop.dfs.DataNode:
141.30.xxx.xxx:50010:DataXceiver: java.io.IOException: Too many open files
at sun.nio.ch.IOUtil.initPipe(Native Method)
at sun.nio.ch.EPollSelectorImpl.<init>(Unknown Source)
at sun.nio.ch.EPollSelectorProvider.openSelector(Unknown Source)
at sun.nio.ch.Util.getTemporarySelector(Unknown Source)
at sun.nio.ch.SocketAdaptor.connect(Unknown Source)
at
org.apache.hadoop.dfs.DataNode$DataXceiver.writeBlock(DataNode.java:1114)
at org.apache.hadoop.dfs.DataNode$DataXceiver.run(DataNode.java:956)
at java.lang.Thread.run(Unknown Source){noformat}
I ran the same experiment with same high workload (50 dfs clients with 40
streams each writing concurrently files on a 8 nodes DFS cluster) with the
0.16.1 release and no exception is thrown. So it looks like a bug to me...
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