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From "Andy Isaacson (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-2554) Add separate metrics for missing blocks with desired replication level 1
Date Sat, 18 Aug 2012 22:15:38 GMT

     [ https://issues.apache.org/jira/browse/HDFS-2554?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Andy Isaacson updated HDFS-2554:
--------------------------------

    Attachment: hdfs-2554.txt

Attach patch implementing new statistics.

One downside to this patch is that we iterate the entire block map under a writer lock every
3 seconds.  Benchmarks show this taking 85 ms on average for 200,000 blocks (Sun JDK 1.6.0_20
64-bit on Xeon E5540 2.53 GHz).  Still gathering data on a range of DFS sizes. 
                
> Add separate metrics for missing blocks with desired replication level 1
> ------------------------------------------------------------------------
>
>                 Key: HDFS-2554
>                 URL: https://issues.apache.org/jira/browse/HDFS-2554
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: name-node
>    Affects Versions: 2.0.0-alpha
>            Reporter: Todd Lipcon
>            Assignee: Andy Isaacson
>            Priority: Minor
>         Attachments: hdfs-2554.txt
>
>
> Some users use replication level set to 1 for datasets which are unimportant and can
be lost with no worry (eg the output of terasort tests). But other data on the cluster is
important and should not be lost. It would be useful to separate the metric for missing blocks
by the desired replication level of those blocks, so that one could ignore missing blocks
at repl 1 while still alerting on missing blocks with higher desired replication.

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