[jira] Created: (HDFS-1479) Massive file deletion causes some timeouts in writers

["Zheng Shao (JIRA)" <ji...@apache.org>]

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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