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From "Sanjay Radia (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2181) Seperate HDFS wire protocol data types
Date Thu, 06 Oct 2011 02:04:29 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2181?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13121673#comment-13121673
] 

Sanjay Radia commented on HDFS-2181:
------------------------------------

There are two ways to support compatibility: (see the doc i posted  in HADOOP-7347)
# Maintain compatibility by simply adding new methods and new types (ie no changes to signatures
of existing methods)
# Have the server support multiple protocols and the client picking the right one (we need
to figure out a way for the 
client to pick the right protocol based on what the server supports - i have ideas on this
but have not supplied a patch so far.)

I am proposing that we use #1 (within and across releases) till we move to PB or Avro. Say
we move to PB in release 25 (hypothetically) then release 24 can continue to use R23.
When we move to PB or Avro we use approach 2 since customer will expect compatibility across
releases. BTW approach 2 can also be used to support compatibility between 20 and 23.

I assume that I have your +1 having addressed your feedback and will commit this patch later
tonight.

                
> Seperate HDFS wire protocol data types
> --------------------------------------
>
>                 Key: HDFS-2181
>                 URL: https://issues.apache.org/jira/browse/HDFS-2181
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>            Reporter: Sanjay Radia
>            Assignee: Sanjay Radia
>         Attachments: separateDataType1.patch, separateDataType10.patch, separateDataType11.patch,
separateDataType12.patch, separateDataType13.patch, separateDataType14.patch, separateDataType16.patch,
separateDataType19.patch, separateDataType2.patch, separateDataType6.patch, separateDataType7.patch,
separateDataType8.patch, separateDataType9.patch
>
>


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