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From "Jing Zhao (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4127) Log message is not correct in case of short of replica
Date Mon, 29 Oct 2012 20:58:12 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4127?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13486345#comment-13486345
] 

Jing Zhao commented on HDFS-4127:
---------------------------------

Hi Junping, so after you make data node 0&1 not qualified for choosing, I think you may
also need to reset these two nodes back to healthy state at the end of the new testcase, otherwise
the two unqualified nodes will affect the following testcases. 

Another thing is, when calculating the number of replicas still in need for the log output,
do we also need to consider the original size of the results? For example, when calling the
chooseTarget, if there are already 3 nodes chosen (i.e., we want to increase the number of
replicas from 3 to N), after selecting another S nodes, totalReplicasExpected should be N-3,
and the size of the results is 3+S, and we should expect (N-3)-(3+S)+3=N-3-S more nodes.
                
> Log message is not correct in case of short of replica
> ------------------------------------------------------
>
>                 Key: HDFS-4127
>                 URL: https://issues.apache.org/jira/browse/HDFS-4127
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: name-node
>    Affects Versions: 1.0.4, 2.0.2-alpha
>            Reporter: Junping Du
>            Assignee: Junping Du
>            Priority: Minor
>         Attachments: HDFS-4127.patch
>
>
> For some reason that block cannot be placed with enough replica (like no enough available
data nodes), it will throw a warning with wrong number of replica in short.

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