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From "Hairong Kuang (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-163) If a DFS datanode cannot write onto its file system. it should tell the name node not to assign new blocks to it.
Date Fri, 19 May 2006 17:58:31 GMT
    [ http://issues.apache.org/jira/browse/HADOOP-163?page=comments#action_12412547 ] 

Hairong Kuang commented on HADOOP-163:
--------------------------------------

I plan to take a simple approach to this problem. If a data node finds out that it can not
write to its disk. It reports to the name node and aborts. The name node logs the error and
alerts it on the http UI.

I will use the existing data node protocol "errorReport" for the error reporting but with
a minor change. In addition to the parameter error message, the rpc will also send an error
code so that the name node does not need to parse the error message to figure out which action
to take.

> If a DFS datanode cannot write onto its file system. it should tell the name node not
to assign new blocks to it.
> -----------------------------------------------------------------------------------------------------------------
>
>          Key: HADOOP-163
>          URL: http://issues.apache.org/jira/browse/HADOOP-163
>      Project: Hadoop
>         Type: Bug

>   Components: dfs
>     Versions: 0.2
>     Reporter: Runping Qi
>     Assignee: Hairong Kuang
>      Fix For: 0.3

>
> I observed that sometime, if a file of a data node is not mounted properly, it may not
be writable. In this case, any data writes will fail. The name node should stop assigning
new blocks to that data node. The webpage should show that node is in an abnormal state.

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