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From "SammiChen (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-11314) Validate client-provided EC schema on the NameNode
Date Sun, 15 Jan 2017 02:33:26 GMT

    [ https://issues.apache.org/jira/browse/HDFS-11314?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15823012#comment-15823012

SammiChen commented on HDFS-11314:

So if a user sets an EC policy on a directory/file, NameNode should check whether this EC
policy can be fulfilled by current data nodes. If NameNode can't fulfill the EC policy, then
fail it.  Correct? 
Currently, if a cluster has 10 nodes, a RS(10,4) policy will succeed. It will fail unless
the cluster only has 9 nodes. Should we raise the bar so that a EC policy will succeed only
when the cluster has more datanodes that policy's (data + parity) block number?  
"a pre-approved list determined by the cluster administrator" can I know where or how the
cluster administrator provide such list? 

> Validate client-provided EC schema on the NameNode
> --------------------------------------------------
>                 Key: HDFS-11314
>                 URL: https://issues.apache.org/jira/browse/HDFS-11314
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: erasure-coding
>    Affects Versions: 3.0.0-alpha1
>            Reporter: Andrew Wang
>              Labels: hdfs-ec-3.0-must-do
> Filing based on discussion in HDFS-8095. A user might specify a policy that is not appropriate
for the cluster, e.g. a RS (10,4) policy when the cluster only has 10 nodes. The NN should
only allow the client to choose from a pre-approved list determined by the cluster administrator.

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