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From "Vinay (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3734) TestFSEditLogLoader.testReplicationAdjusted() will hang if number of blocks are more than one
Date Wed, 01 Aug 2012 11:39:03 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3734?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13426535#comment-13426535
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Vinay commented on HDFS-3734:
-----------------------------

I agree. Existing testcase will pass.

If we add one more file before restart with replication factor as 1, then change min replication
and restart then testcase will hang in waiting for the cluster to be up.

                
> TestFSEditLogLoader.testReplicationAdjusted() will hang if number of blocks are more
than one
> ---------------------------------------------------------------------------------------------
>
>                 Key: HDFS-3734
>                 URL: https://issues.apache.org/jira/browse/HDFS-3734
>             Project: Hadoop HDFS
>          Issue Type: Bug
>    Affects Versions: 2.1.0-alpha, 3.0.0
>            Reporter: Vinay
>
> TestFSEditLogLoader.testReplicationAdjusted() which was added in HDFS-2003 will fail
if number of blocks before cluster restart are more than one.
> Test Scenario:
> --------------
> 1. Write a file with min replication as 1 and replication factor as 1.
> 2. Change the min replication to 2 and restart the cluster.
> Expected: Min replication should be automatically reset on cluster restart by replicating
more blocks.
> Currently, if the number of blocks before restart is only one, then on restart NN will
not enter safemode, hence replication will happen and satisfies min replication factor.
> If initial blocks count is more than 1 which are having replication factor as 1, then
on restart NN will enter safemode and will never come out.

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