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