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From "Konstantin Shvachko (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (HDFS-1239) All datanodes are bad in 2nd phase
Date Tue, 22 Jun 2010 19:12:58 GMT

     [ https://issues.apache.org/jira/browse/HDFS-1239?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Konstantin Shvachko resolved HDFS-1239.
---------------------------------------

    Resolution: Invalid

> All datanodes are bad in 2nd phase
> ----------------------------------
>
>                 Key: HDFS-1239
>                 URL: https://issues.apache.org/jira/browse/HDFS-1239
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: hdfs client
>    Affects Versions: 0.20.1
>            Reporter: Thanh Do
>
> - Setups:
> number of datanodes = 2
> replication factor = 2
> Type of failure: transient fault (a java i/o call throws an exception or return false)
> Number of failures = 2
> when/where failures happen = during the 2nd phase of the pipeline, each happens at each
datanode when trying to perform I/O 
> (e.g. dataoutputstream.flush())
>  
> - Details:
>  
> This is similar to HDFS-1237.
> In this case, node1 throws exception that makes client creates
> a pipeline only with node2, then tries to redo the whole thing,
> which throws another failure. So at this point, the client considers
> all datanodes are bad, and never retries the whole thing again, 
> (i.e. it never asks the namenode again to ask for a new set of datanodes).
> In HDFS-1237, the bug is due to permanent disk fault. In this case, it's about transient
error.
> This bug was found by our Failure Testing Service framework:
> http://www.eecs.berkeley.edu/Pubs/TechRpts/2010/EECS-2010-98.html
> For questions, please email us: Thanh Do (thanhdo@cs.wisc.edu) and
> Haryadi Gunawi (haryadi@eecs.berkeley.edu)

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