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https://issues.apache.org/jira/browse/HDFS-13601?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16486766#comment-16486766
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Xiao Chen commented on HDFS-13601:
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Thanks Andrew.
+1 pending:
I think poolId could be null ({{ExtendedBlock}} handles null at least), in
which case {{PBHelperClient#getFixedByteString}} may NPE.
> Optimize ByteString conversions in PBHelper
> -------------------------------------------
>
> Key: HDFS-13601
> URL: https://issues.apache.org/jira/browse/HDFS-13601
> Project: Hadoop HDFS
> Issue Type: Bug
> Affects Versions: 3.1.0, 2.9.1
> Reporter: Andrew Wang
> Assignee: Andrew Wang
> Priority: Major
> Attachments: HDFS-13601.001.patch, HDFS-13601.002.patch,
> HDFS-13601.003.patch, HDFS-13601.004.patch
>
>
> While doing some profiling of the NN with JMC, I saw a lot of time being
> spent on String->ByteString conversions. These are often the same strings
> being converted over and over again, meaning there's room for optimization.
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