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https://issues.apache.org/jira/browse/HDFS-9557?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15058611#comment-15058611
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Colin Patrick McCabe commented on HDFS-9557:
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+1 pending jenkins.
Long-term, I think we might want to switch to a PB library that does less
object allocation.
> Reduce object allocation in PB conversion
> -----------------------------------------
>
> Key: HDFS-9557
> URL: https://issues.apache.org/jira/browse/HDFS-9557
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: hdfs-client
> Affects Versions: 2.8.0
> Reporter: Daryn Sharp
> Assignee: Daryn Sharp
> Attachments: HDFS-9557.patch
>
>
> PB conversions use {{ByteString.copyFrom}} to populate the builder.
> Unfortunately this creates unique instances for empty arrays instead of
> returning the singleton {{ByteString.EMPTY}}.
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