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https://issues.apache.org/jira/browse/HDFS-9768?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15144878#comment-15144878
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Hudson commented on HDFS-9768:
------------------------------
FAILURE: Integrated in Hadoop-trunk-Commit #9293 (See
[https://builds.apache.org/job/Hadoop-trunk-Commit/9293/])
HDFS-9768. Reuse ObjectMapper instance in HDFS to improve the (aajisaka: rev
e6a7044b8530afded8f8e86ff309dd0e4d39238a)
*
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java
*
hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/web/oauth2/ConfRefreshTokenBasedAccessTokenProvider.java
* hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
*
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/FsVolumeImpl.java
*
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/web/JsonUtil.java
*
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/tools/offlineImageViewer/FSImageLoader.java
*
hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/web/oauth2/CredentialBasedAccessTokenProvider.java
> Reuse objectMapper instance in HDFS to improve the performance
> --------------------------------------------------------------
>
> Key: HDFS-9768
> URL: https://issues.apache.org/jira/browse/HDFS-9768
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: performance
> Affects Versions: 2.7.1
> Reporter: Lin Yiqun
> Assignee: Lin Yiqun
> Fix For: 2.8.0
>
> Attachments: HDFS-9768.001.patch, HDFS-9768.002.patch,
> HDFS-9768.003.patch
>
>
> In HDFS-9724, it have reused the ObjectMapper instance to improve the
> performance in {{WebHDFS}}. But in other places, it still using ObjectMapper
> by {{new ObjectMapper()}}. We probably need a comprehensive review across the
> whole codebase to look for this pattern and modify them. In MAPREDUCE-6626,
> YARN-4668, these jiras also work for this.
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