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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 Thu, 03 Sep 2009 01:33:32 GMT

    [ https://issues.apache.org/jira/browse/HDFS-578?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12750765#action_12750765
] 

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

Attached a patch that allows users to use server default values when creating a file (by specifying
-1). The 4 params (blockSize, bytesPerChecksum, writePacketSize and io.file.buffer.size) are
bundled together. If the user chooses to use server default for blockSize, all 4 params will
use server defaults. DFSClient caches server default values for 1 hour and fetches them from
server only when necessary.

On a separate note, client can choose io.file.buffer.size and pass it to create() call, but
it is actually ignored in the current implementation.

> 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
>         Attachments: h578-13.patch
>
>
> 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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