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From "Hairong Kuang (JIRA)" <j...@apache.org>
Subject [jira] Updated: (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, 26 May 2006 22:23:31 GMT
     [ http://issues.apache.org/jira/browse/HADOOP-163?page=all ]

Hairong Kuang updated HADOOP-163:
---------------------------------

    Attachment: disk.patch

In this patch, if a data node finds that its data directory becomes not readable or writable,
it logs the error and reports the problem to its namen ode and shut down itself. When the
name node receives the error report, it lots the error and removes the data node info.

A data node detects disk problem at startup time, when it receives a r/w request, after it
receives a command from its name node, and before it sends out a block report. A data node
will not start up if its data dir is not readable or writable. 

> 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
>  Attachments: disk.patch
>
> 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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