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https://issues.apache.org/jira/browse/HADOOP-13438?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15801530#comment-15801530
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Kihwal Lee commented on HADOOP-13438:
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It is indeed in 2.8, but the commit message has a typo as Andrew pointed out.
> 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
> Fix For: 2.8.0, 3.0.0-alpha1
>
> Attachments: HADOOP-13438.patch, HADOOP-13438.patch.1
>
>
> 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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