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From "Runping Qi (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-3124) DFS data node should not use hard coded 10 minutes as write timeout.
Date Sat, 29 Mar 2008 14:16:28 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-3124?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12583322#action_12583322

Runping Qi commented on HADOOP-3124:

bq. I am curious to know if you have any info on why one of the datanode's was not able to
read for 10minutes.

me too. It may deserve a separate JIRA.
In my latest case, I believe it was not due to slow disk/network card, or overloaded machines.
I beleive it is similar to hadoop-3033.


> DFS data node should not use hard coded 10 minutes as write timeout.
> --------------------------------------------------------------------
>                 Key: HADOOP-3124
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3124
>             Project: Hadoop Core
>          Issue Type: Bug
>            Reporter: Runping Qi
> This problem happens in 0.17 trunk
> I saw reducers waited 10 minutes for writing data to dfs and got timeout.
> The client retries again and timeouted after another 19 minutes.
> After looking into the code, it seems that the dfs data node uses 10 minutes as timeout
for wtiting data into the data node pipeline.
> I thing we have three issues:
> 1. The 10 minutes timeout value is too big for writing a chunk of data (64K) through
the data node pipeline.
> 2. The timeout value should not be hard coded.
> 3. Different datanodes in a pipeline should use different timeout values for writing
to the downstream.
> A reasonable one maybe (20 secs * numOfDataNodesInTheDownStreamPipe).
> For example, if the replication factor is 3, the client uses 60 secs, the first data
node use 40 secs, the second datanode use 20secs.

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