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Date: Fri, 3 Oct 2008 12:55:44 -0700 (PDT)
From: "Sanjay Radia (JIRA)" <jira@apache.org>
To: core-dev@hadoop.apache.org
Subject: [jira] Commented: (HADOOP-4228) dfs datanode metrics, bytes_read,
 bytes_written overflows due to incorrect type used.
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    [ https://issues.apache.org/jira/browse/HADOOP-4228?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12636721#action_12636721 ] 

Sanjay Radia commented on HADOOP-4228:
--------------------------------------

+1

> dfs datanode metrics, bytes_read, bytes_written overflows due to incorrect type used.
> -------------------------------------------------------------------------------------
>
>                 Key: HADOOP-4228
>                 URL: https://issues.apache.org/jira/browse/HADOOP-4228
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: metrics
>    Affects Versions: 0.18.2, 0.19.0
>         Environment: Red Hat Enterprise Linux AS release 4 (Nahant Update 5), Java 1.6.
>            Reporter: Eric Yang
>            Assignee: Eric Yang
>            Priority: Blocker
>         Attachments: HADOOP-4228-trunk.patch, HADOOP-4228.patch, metricsLong.patch
>
>
> bytes_read, and bytes_written metrics are using int (MetricsTimeVaryingInt) as counter.  This type is too small to store the bytes_read and bytes_written metrics.  Recommend to change this to long (metricsLongValue).

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