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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-10560) DiskBalancer: Reuse ObjectMapper instance to improve the performance
Date Tue, 16 Aug 2016 17:44:21 GMT

    [ https://issues.apache.org/jira/browse/HDFS-10560?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15423142#comment-15423142
] 

Hudson commented on HDFS-10560:
-------------------------------

SUCCESS: Integrated in Jenkins build Hadoop-trunk-Commit #10284 (See [https://builds.apache.org/job/Hadoop-trunk-Commit/10284/])
HDFS-10560. DiskBalancer: Reuse ObjectMapper instance to improve the (aengineer: rev b047bc7270f3461156e4d08423c728ee9c67dba5)
* (edit) hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/server/datanode/DiskBalancerWorkStatus.java
* (edit) hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/diskbalancer/command/Command.java
* (edit) hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/diskbalancer/datamodel/DiskBalancerCluster.java
* (edit) hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/diskbalancer/datamodel/DiskBalancerVolume.java
* (edit) hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/diskbalancer/connectors/JsonNodeConnector.java
* (edit) hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/server/datanode/DiskBalancerWorkItem.java
* (edit) hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/DiskBalancer.java


> DiskBalancer: Reuse ObjectMapper instance to improve the performance
> --------------------------------------------------------------------
>
>                 Key: HDFS-10560
>                 URL: https://issues.apache.org/jira/browse/HDFS-10560
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: balancer & mover
>    Affects Versions: HDFS-1312
>            Reporter: Yiqun Lin
>            Assignee: Yiqun Lin
>         Attachments: HDFS-10560-HDFS-1312.001.patch, HDFS-10560-HDFS-1312.002.patch,
HDFS-10560-HDFS-1312.003.patch, HDFS-10560.004.patch, HDFS-10560.005.patch
>
>
> In branch HDFS-1312, there are many places use {{ObjectMapper}} instances to do the json-object
transform. But {{ObjectMapper}} instance is relatively heavy, we should reuse them as possible.
And In addition, {{ObjectMapper}} is thread safe, can see this link:http://wiki.fasterxml.com/JacksonFAQ.
> Here are related issues: HDFS-9724, HDFS-9768. We can see detail info in this issues.



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