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https://issues.apache.org/jira/browse/HDFS-10662?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15407840#comment-15407840
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Hudson commented on HDFS-10662:
-------------------------------
SUCCESS: Integrated in Hadoop-trunk-Commit #10214 (See
[https://builds.apache.org/job/Hadoop-trunk-Commit/10214/])
HDFS-10662. Optimize UTF8 string/byte conversions. Contributed by Daryn
(kihwal: rev 6ae39199dac6ac7be6802b31452552c76da16e24)
*
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSDirStatAndListingOp.java
*
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSDirXAttrOp.java
*
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSDirMkdirOp.java
*
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSUtil.java
*
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSDirWriteFileOp.java
*
hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/DFSUtilClient.java
> Optimize UTF8 string/byte conversions
> -------------------------------------
>
> Key: HDFS-10662
> URL: https://issues.apache.org/jira/browse/HDFS-10662
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: hdfs
> Reporter: Daryn Sharp
> Assignee: Daryn Sharp
> Attachments: HDFS-10662.patch, HDFS-10662.patch.1
>
>
> String/byte conversions may take either a Charset instance or its canonical
> name. One might think a Charset instance would be faster due to avoiding a
> lookup and instantiation of a Charset, but it's not. The canonical string
> name variants will cache the string encoder/decoder (obtained from a Charset)
> resulting in better performance.
> LOG4J2-935 describes a real-world performance boost. I micro-benched a
> marginal runtime improvement on jdk 7/8. However for a 16 byte path, using
> the canonical name generated 50% less garbage. For a 64 byte path, 25% of
> the garbage. Given the sheer number of times that paths are (re)parsed, the
> cost adds up quickly.
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