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https://issues.apache.org/jira/browse/HDFS-10560?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Yiqun Lin updated HDFS-10560:
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Attachment: HDFS-10560-HDFS-1312.002.patch
The failed test was related. It seemed these code lead the method
{{NodePlan#parseJson}} threw Exception.
{code}
public class NodePlan {
@JsonTypeInfo(use = JsonTypeInfo.Id.CLASS,
include = JsonTypeInfo.As.PROPERTY, property = "@class")
{code}
I'd like to restore the code in {{NodePlan}}, post a new patch.
> 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
>
>
> 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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