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HDFS >> mail # dev >> [DISCUSS] Clarification on Compatibility Policy: Upgraded Client + Old Server

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Re: [DISCUSS] Clarification on Compatibility Policy: Upgraded Client + Old Server
I'm clearly supportive of this, though of course the testing costs needed
to back up the assertion make it more expensive than just a statement.

Two issues

-we'd need to make clear that new cluster features that a client can invoke
won't be available. You can't expect snapshot or symlink support running
against a -2.2.0 cluster, even if the client supports it.

-in YARN, there are no guarantees that an app compiled against later YARN
APIs will work in old clusters. Because YARN apps upload themselves to the
server, and run with their hadoop, hdfs & yarn libraries. We have to do a
bit of introspection in our code already to support this situation. The
compatibility doc would need to be clear on that too: "YARN apps that use
new APIs (including new fields in datastructures) can expect link

On 20 March 2014 04:25, Vinayakumar B <[EMAIL PROTECTED]> wrote:
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