Massive file deletion causes some timeouts in writers
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Key: HDFS-1479
URL: https://issues.apache.org/jira/browse/HDFS-1479
Project: Hadoop HDFS
Issue Type: Improvement
Affects Versions: 0.20.2
Reporter: Zheng Shao
Assignee: Zheng Shao
Priority: Minor
When we do a massive deletion of files, we saw some timeouts in writers who's
writing to HDFS. This does not happen to all DataNodes, but it's happening
regularly enough that we would like to fix it.
{code}
yyy.xxx.com: 10/10/25 00:55:32 WARN hdfs.DFSClient: DFSOutputStream
ResponseProcessor exception for block
blk_-5459995953259765112_37619608java.net.SocketTimeoutException: 69000 millis
timeout while waiting for channel to be ready for read. ch :
java.nio.channels.SocketChannel[connected local=/10.10.10.10:56319
remote=/10.10.10.10:50010]
{code}
This is caused by the default setting of AsyncDiskService, which starts 4
threads per volume to delete files.
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