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From "J.Andreina (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-5189) Rename the "CorruptBlocks" metric to "CorruptReplicas"
Date Fri, 05 Jun 2015 02:05:39 GMT

    [ https://issues.apache.org/jira/browse/HDFS-5189?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14573943#comment-14573943

J.Andreina commented on HDFS-5189:

Checkstyle error is due to file length exceeding 2000 lines , so ignoring it. 
Please review.

> Rename the "CorruptBlocks" metric to "CorruptReplicas"
> ------------------------------------------------------
>                 Key: HDFS-5189
>                 URL: https://issues.apache.org/jira/browse/HDFS-5189
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: namenode
>    Affects Versions: 2.1.0-beta
>            Reporter: Harsh J
>            Assignee: J.Andreina
>            Priority: Minor
>         Attachments: HDFS-5189.1.patch
> The NameNode increments a "CorruptBlocks" metric even if only one of the block's
> replicas is reported corrupt (genuine checksum fail, or even if a
> replica has a bad genstamp). In cases where this is incremented, fsck
> still reports a healthy state.
> This is confusing to users and causes false alarm as they feel this is to be monitored
(instead of MissingBlocks). The metric is truly trying to report only corrupt replicas, not
whole blocks, and ought to be renamed.
> FWIW, the "dfsadmin -report" reports a proper string of "Blocks with corrupt replicas:"
when printing this count.

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