You are viewing a plain text version of this content. The canonical link for it is here.
Posted to common-dev@hadoop.apache.org by "Doug Cutting (JIRA)" <ji...@apache.org> on 2006/04/10 23:08:03 UTC
[jira] Updated: (HADOOP-124) don't permit two datanodes to run from
same dfs.data.dir
[ http://issues.apache.org/jira/browse/HADOOP-124?page=all ]
Doug Cutting updated HADOOP-124:
--------------------------------
Summary: don't permit two datanodes to run from same dfs.data.dir (was: Files still rotting in DFS of latest Hadoop)
Changing the summary to better describe what we intend to fix.
> don't permit two datanodes to run from same dfs.data.dir
> --------------------------------------------------------
>
> Key: HADOOP-124
> URL: http://issues.apache.org/jira/browse/HADOOP-124
> Project: Hadoop
> Type: Bug
> Components: dfs
> Versions: 0.2
> Environment: ~30 node cluster
> Reporter: Bryan Pendleton
> Priority: Critical
>
> DFS files are still rotting.
> I suspect that there's a problem with block accounting/detecting identical hosts in the namenode. I have 30 physical nodes, with various numbers of local disks, meaning that my current 'bin/hadoop dfs -report" shows 80 nodes after a full restart. However, when I discovered the problem (which resulted in losing about 500gb worth of temporary data because of missing blocks in some of the larger chunks) -report showed 96 nodes. I suspect somehow there were extra datanodes running against the same paths, and that the namenode was counting those as replicated instances, which then showed up over-replicated, and one of them was told to delete its local block, leading to the block actually getting lost.
> I will debug it more the next time the situation arises. This is at least the 5th time I've had a large amount of file data "rot" in DFS since January.
--
This message is automatically generated by JIRA.
-
If you think it was sent incorrectly contact one of the administrators:
http://issues.apache.org/jira/secure/Administrators.jspa
-
For more information on JIRA, see:
http://www.atlassian.com/software/jira