JamesLi created HDFS-5671:
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Summary: When Hbase RegionServer request block to DataNode and
"java.io.IOException" occurs, the fail TCP socket is not closed (in status
"CLOSE_WAIT" with port 1004 of DataNode)
Key: HDFS-5671
URL: https://issues.apache.org/jira/browse/HDFS-5671
Project: Hadoop HDFS
Issue Type: Bug
Components: hdfs-client
Affects Versions: 2.2.0
Environment: hadoop-2.2.0
java version "1.6.0_31"
Java(TM) SE Runtime Environment (build 1.6.0_31-b04)
Java HotSpot(TM) 64-Bit Server VM (build 20.6-b01, mixed mode)
Linux 2.6.32-358.14.1.el6.x86_64 #1 SMP Tue Jul 16 23:51:20 UTC 2013 x86_64
x86_64 x86_64 GNU/Linux
Reporter: JamesLi
lsof -i TCP:1004 | grep -c CLOSE_WAIT
18235
When hbase regionserver request a file's block to DataNode:1004. If request
fail because "java.io.IOException: Got error for OP_READ_BLOCK,Block token is
expired." Occurs and the TCP socket that regionserver using is not closed.
I think the problem above is in DatanodeInfo blockSeekTo(long target) - line
539 of Class DFSInputStream
The connection regionserver using is BlockReader, it created on line 574 :
blockReader = getBlockReader(targetAddr, chosenNode, src, blk,
accessToken, offsetIntoBlock, blk.getNumBytes() - offsetIntoBlock,
buffersize, verifyChecksum, dfsClient.clientName);
and if this connection fail, regionserver will fetch a new access token , and
old Connection is not closed here.
I think need small code to close old Connection when exception happens:
if(blockReader != null)
try{
blockReader.close();
blockReader = null;
} catch (IOException exc) {
DFSClient.LOG.error("Close connection to " + targetAddr
+ " failed");
}
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