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Date: Wed, 1 Aug 2012 11:03:03 +0000 (UTC)
From: "Yanbo Liang (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
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Subject: [jira] [Commented] (HDFS-3734)
 TestFSEditLogLoader.testReplicationAdjusted() will hang if number of blocks
 are more than one
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    [ https://issues.apache.org/jira/browse/HDFS-3734?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13426518#comment-13426518 ] 

Yanbo Liang commented on HDFS-3734:
-----------------------------------

Cluster have 2 DataNodes, and file is written with replication factor as 1. 
Later min replication is changed to 2, same as number of datanodes available and cluster is restarted.

If the environment configured like this, I run the test case success.
Pls attach the failure case log if it is convenient.
                
> 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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