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From "Eli Collins (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2554) Add separate metrics for missing blocks with desired replication level 1
Date Mon, 20 Aug 2012 18:37:38 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2554?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13438073#comment-13438073
] 

Eli Collins commented on HDFS-2554:
-----------------------------------

Looks like we need another rev:
{noformat}
2012-08-18 22:38:58,132 FATAL blockmanagement.BlockManager (BlockManager.java:run(3047)) -
ReplicationMonitor thread received Runtime exception. 
java.lang.NullPointerException
	at org.apache.hadoop.hdfs.server.blockmanagement.BlockManager.updateCorruptMissingCounts(BlockManager.java:1090)
	at org.apache.hadoop.hdfs.server.blockmanagement.BlockManager.updateState(BlockManager.java:1107)
	at org.apache.hadoop.hdfs.server.blockmanagement.BlockManager.computeDatanodeWork(BlockManager.java:3083)
	at org.apache.hadoop.hdfs.server.blockmanagement.BlockManager$ReplicationMonitor.run(BlockManager.java:3040)
	at java.lang.Thread.run(Thread.java:662)
{noformat}
                
> 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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