Daryn Sharp created HADOOP-13438:
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Summary: 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
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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