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From "Kan Zhang (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-578) Support for using server default values for blockSize and replication when creating a file
Date Tue, 01 Sep 2009 17:48:33 GMT

    [ https://issues.apache.org/jira/browse/HDFS-578?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12750010#action_12750010
] 

Kan Zhang commented on HDFS-578:
--------------------------------

I suggest we bundle the 3 params (blockSize, bytesPerChecksum and writePacketSize) together.
If a client decides to use server default for blockSize, then all 3 will use server defaults.
If a (sophisticated) client decides not to use server default for blockSize, then the client
has to provide valid values for all 3 params. In particular, the validation that blockSize
matches bytesPerChecksum is done at the client side since currently bytesPerChecksum is not
sent to the namenode on the create() call. but I'm open to adding this param to the create()
call so that it can be validated on the namenode. Thoughts? 

> Support for using server default values for blockSize and replication when creating a
file
> ------------------------------------------------------------------------------------------
>
>                 Key: HDFS-578
>                 URL: https://issues.apache.org/jira/browse/HDFS-578
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: hdfs client, name-node
>            Reporter: Kan Zhang
>            Assignee: Kan Zhang
>
> This is a sub-task of HADOOP-4952. This improvement makes it possible for a client to
specify that it wants to use the server default values for blockSize and replication params
when creating a file.

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