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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 Sat, 04 Aug 2012 08:25:02 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3734?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13428582#comment-13428582

Vinay commented on HDFS-3734:

{quote}Because of the replication before the cluster restart is persistent stored in the metadata
of each file, I think we can calculate safe block number with the former replication rather
than the modified one. Then the cluster will exit safe mode and execute replicate operation
to achieve required replication. If this scenario is ok, I can fix it.{quote}
+1 for this. 

[~umamaheswararao] what you say..?
> 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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