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https://issues.apache.org/jira/browse/HBASE-15638?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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stack updated HBASE-15638:
--------------------------
Priority: Critical (was: Major)
Hadoop Flags: Incompatible change
This is looking to be an incompatible change that breaks endpoint CPs at least.
The CP rpc channels take pb Descriptors and an RpcController to exec. The
endpoint would have to be regenerated using our pb version and with the
appropriate shade offset in the packaging. Any thoughts here [~ghelmling]?
> Shade protobuf
> --------------
>
> Key: HBASE-15638
> URL: https://issues.apache.org/jira/browse/HBASE-15638
> Project: HBase
> Issue Type: Bug
> Components: Protobufs
> Reporter: stack
> Priority: Critical
> Attachments: 15638v2.patch, as.far.as.server.patch
>
>
> Shade protobufs so we can move to a different version without breaking the
> world. We want to get up on pb3 because it has unsafe methods that allow us
> save on copies; it also has some means of dealing with BBs so we can pass it
> offheap DBBs. We'll probably want to change PB3 to open it up some more too
> so we can stay offheap as we traverse PB. This issue comes of [~anoop.hbase]
> and [~ram_krish]'s offheaping of the readpath work.
> This change is mostly straight-forward but there are some tricky bits:
> # How to interface with HDFS? It wants its ByteStrings. Here in particular
> in FanOutOneBlockAsyncDFSOutputSaslHelper:
> {code}
> if (payload != null) {
> builder.setPayload(ByteString.copyFrom(payload));
> }
> {code}
> # [~busbey] also points out that we need to take care of endpoints done as
> pb. Test at least.
> Let me raise this one on the dev list too.
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