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From "Junping Du (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-12049) Recommissioning live nodes stalls the NN
Date Tue, 01 Aug 2017 00:49:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-12049?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16108222#comment-16108222
] 

Junping Du commented on HDFS-12049:
-----------------------------------

Moved. Thanks Daryn.

> Recommissioning live nodes stalls the NN
> ----------------------------------------
>
>                 Key: HDFS-12049
>                 URL: https://issues.apache.org/jira/browse/HDFS-12049
>             Project: Hadoop HDFS
>          Issue Type: Bug
>    Affects Versions: 2.6.0
>            Reporter: Daryn Sharp
>            Priority: Critical
>
> A node refresh will recommission included nodes that are alive and in decommissioning
or decommissioned state.  The recommission will scan all blocks on the node, find over replicated
blocks, chose an excess, queue an invalidate.
> The process is expensive and worsened by overhead of storage types (even when not in
use).  It can be especially devastating because the write lock is held for the entire node
refresh.  _Recommissioning 67 nodes with ~500k blocks/node stalled rpc services for over 4
mins._



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