Ashu Pachauri commented on HBASE-16752:

Test failures are unrelated to the patch.

> Upgrading from 1.2 to 1.3 can lead to replication failures due to difference 
> in RPC size limit
> ----------------------------------------------------------------------------------------------
>                 Key: HBASE-16752
>                 URL: https://issues.apache.org/jira/browse/HBASE-16752
>             Project: HBase
>          Issue Type: Bug
>          Components: Replication, rpc
>    Affects Versions: 2.0.0, 1.3.0
>            Reporter: Ashu Pachauri
>            Assignee: Ashu Pachauri
>         Attachments: HBASE-16752.V1.patch, HBASE-16752.V2.patch
> In HBase 1.2, we don't limit size of a single RPC but in 1.3 we limit it by 
> default to 256 MB.  This means that during upgrade scenarios (or when source 
> is 1.2 peer is already on 1.3), it's possible to encounter a situation where 
> we try to send an rpc with size greater than 256 MB because we never unroll a 
> WALEdit while sending replication traffic.
> RpcServer throws the underlying exception locally, but closes the connection 
> with returning the underlying error to the client, and client only sees a 
> "Broken pipe" error.
> I am not sure what is the proper fix here (or if one is needed) to make sure 
> this does not happen, but we should return the underlying exception to the 
> RpcClient, because without it, it can be difficult to diagnose the problem, 
> especially for someone new to HBase.

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