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From "Andrew Wang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7165) Separate block metrics for files with replication count 1
Date Tue, 21 Oct 2014 20:28:34 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7165?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14179022#comment-14179022
] 

Andrew Wang commented on HDFS-7165:
-----------------------------------

This looks good. One thing I forgot, did you check the MX metrics manually? Would also be
good to have a unit test for metrics either way.

> Separate block metrics for files with replication count 1
> ---------------------------------------------------------
>
>                 Key: HDFS-7165
>                 URL: https://issues.apache.org/jira/browse/HDFS-7165
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>            Reporter: Andrew Wang
>            Assignee: Zhe Zhang
>         Attachments: HDFS-7165-20141003-v1.patch, HDFS-7165-20141009-v1.patch, HDFS-7165-20141010-v1.patch,
HDFS-7165-20141015-v1.patch, HDFS-7165-20141021-v1.patch
>
>
> We see a lot of escalations because someone has written teragen output with a replication
factor of 1, a DN goes down, and a bunch of missing blocks show up. These are normally false
positives, since teragen output is disposable, and generally speaking, users should understand
this is true for all repl=1 files.
> It'd be nice to be able to separate out these repl=1 missing blocks from missing blocks
with higher replication factors..



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