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From "Dmitry Musatov (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-693) java.net.SocketTimeoutException: 480000 millis timeout while waiting for channel to be ready for write exceptions were cast when trying to read file via StreamFile.
Date Wed, 25 Aug 2010 14:04:21 GMT

    [ https://issues.apache.org/jira/browse/HDFS-693?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12902449#action_12902449
] 

Dmitry Musatov commented on HDFS-693:
-------------------------------------

Setting dfs.datanode.socket.write.timeout to zero decreases actual timeout both for DFS Client
and Server, but for Server it also switches from NIO to Regular socket implementation.
Prooflink: http://svn.apache.org/viewvc/hadoop/common/tags/release-0.20.2/src/hdfs/org/apache/hadoop/hdfs/server/datanode/DataNode.java?revision=916569&view=markup
Lines (250,251),(307,308),(403-407) or search for socketWriteTimeout

> java.net.SocketTimeoutException: 480000 millis timeout while waiting for channel to be
ready for write exceptions were cast when trying to read file via StreamFile.
> --------------------------------------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: HDFS-693
>                 URL: https://issues.apache.org/jira/browse/HDFS-693
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: data-node
>    Affects Versions: 0.20.1
>            Reporter: Yajun Dong
>         Attachments: HDFS-693.log
>
>
> To exclude the case of network problem, I found the count of  dataXceiver is about 30.
 Also, I could see the output of netstate -a | grep 50075 has many TIME_WAIT status when this
happened.
> partial log in attachment. 

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