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https://issues.apache.org/jira/browse/HADOOP-13438?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Daryn Sharp updated HADOOP-13438:
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Attachment: HADOOP-13438.patch
Server side only changes to ensure protocol not broken (corresponding client
changes forthcoming).
A new RpcWritable class manages the marshaling of writables and PBs. The
Server passes the ByteBuffer for the read request, instead of the byte[] from
the buffer to eliminate a copy. The RpcWritables use the ByteBuffer to
effectively iterate through the byte[] w/o copying it.
> Optimize IPC server protobuf decoding
> -------------------------------------
>
> Key: HADOOP-13438
> URL: https://issues.apache.org/jira/browse/HADOOP-13438
> Project: Hadoop Common
> Issue Type: Sub-task
> Reporter: Daryn Sharp
> Assignee: Daryn Sharp
> Attachments: HADOOP-13438.patch
>
>
> The current use of the protobuf API uses an expensive code path. The builder
> uses the parser to instantiate a message, then copies the message into the
> builder. The parser is creating multi-layered internally buffering streams
> that cause excessive byte[] allocations.
> Using the parser directly with a coded input stream backed by the byte[] from
> the wire will take a fast-path straight to the pb message's ctor.
> Substantially less garbage is generated.
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