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Date: Wed, 28 Sep 2016 16:49:20 +0000 (UTC)
From: "Kihwal Lee (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
Message-ID: <JIRA.13008135.1475041596000.689136.1475081360638@Atlassian.JIRA>
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References: <JIRA.13008135.1475041596000@Atlassian.JIRA> <JIRA.13008135.1475041596511@arcas>
Subject: [jira] [Commented] (HDFS-10919) Provide admin/debug tool to dump
 out info of a given block
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archived-at: Wed, 28 Sep 2016 16:49:22 -0000


    [ https://issues.apache.org/jira/browse/HDFS-10919?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15530196#comment-15530196 ] 

Kihwal Lee commented on HDFS-10919:
-----------------------------------

Given a block ID you can use {{fsck -blockId}} to get the file it belongs to and other information. We could extend it to provide more information.

> Provide admin/debug tool to dump out info of a given block
> ----------------------------------------------------------
>
>                 Key: HDFS-10919
>                 URL: https://issues.apache.org/jira/browse/HDFS-10919
>             Project: Hadoop HDFS
>          Issue Type: New Feature
>          Components: hdfs
>            Reporter: Yongjun Zhang
>
> We have fsck to find out blocks associated with a file, which is nice. Sometimes, we saw trouble with a specific block, we'd like to collect info about this block, such as
> * what file this block belong to, 
> * where the replicas of this block are located, 
> * whether the block is EC coded; 
> * if a block is EC coded, whether it's a data block, or code
> * if a block is EC coded, what's the codec.
> * if a block is EC coded, what's the block group
> * for the block group, what are the other blocks
> Create this jira to provide such a util, as dfsadmin, or a debug tool.
> Thanks.


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