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From "Mikhail Antonov (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-16752) Upgrading from 1.2 to 1.3 can lead to replication failures due to difference in RPC size limit
Date Tue, 04 Oct 2016 21:14:20 GMT

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Mikhail Antonov commented on HBASE-16752:
-----------------------------------------

I would say it should be fine to return meaningful debuggable exception to the client and
just clearly state in the release notes that in the unlikely scenario that you encounter this
problem the remediation would be to temporarily bump this limit to something bigger.

> 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: 1.3.0
>            Reporter: Ashu Pachauri
>
> 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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