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From "Philip Zeyliger (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7165) Separate block metrics for files with replication count 1
Date Sun, 05 Oct 2014 15:50:34 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7165?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14159566#comment-14159566
] 

Philip Zeyliger commented on HDFS-7165:
---------------------------------------

Seems like we should also expose this in JMX.  See {{hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/NameNodeMXBean.java}}.

> 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
>
>
> 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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