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From "Ravi Prakash (JIRA)" <j...@apache.org>
Subject [jira] [Closed] (HADOOP-14319) Under replicated blocks are not getting re-replicated
Date Tue, 18 Apr 2017 21:27:41 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-14319?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Ravi Prakash closed HADOOP-14319.
---------------------------------

> Under replicated blocks are not getting re-replicated
> -----------------------------------------------------
>
>                 Key: HADOOP-14319
>                 URL: https://issues.apache.org/jira/browse/HADOOP-14319
>             Project: Hadoop Common
>          Issue Type: Bug
>    Affects Versions: 2.7.2
>            Reporter: Anil
>
> Under replicated blocks are not getting re-replicated
> In production Hadoop cluster of 5 Manangement + 5 Data Nodes, under replicated blocks
are not re-replicated even after 2 days. 
> Here is quick view of required configurations;
>  Default replication factor:	3
>  Average block replication:	3.0
>  Corrupt blocks:		0
>  Missing replicas:		0 (0.0 %)
>  Number of data-nodes:		5
>  Number of racks:		1
> After bringing one of the DataNodes down, the replication factor for the blocks allocated
on the Data Node became 2. It is observed that, even after 2 days the replication factor remains
as 2. Under replicated blocks are not getting re-replicated to another DataNodes in the cluster.

> If a Data Node goes down, HDFS will try to replicate the blocks from Dead DN to other
nodes and the priority. Are there any configuration changes to speed up the re-replication
process for the under replicated blocks? 
> When tested for blocks with replication factor 1, the re-replication happened to 2 overnight
in around 10 hours of time. But blocks with 2 replication factor are not being re-replicated
to default replication factor 3. 



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