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https://issues.apache.org/jira/browse/YARN-6501?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15976822#comment-15976822
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Jason Lowe commented on YARN-6501:
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+1 committing this.
> FSSchedulerNode.java fails to compile with JDK7
> -----------------------------------------------
>
> Key: YARN-6501
> URL: https://issues.apache.org/jira/browse/YARN-6501
> Project: Hadoop YARN
> Issue Type: Bug
> Components: resourcemanager
> Affects Versions: 2.9.0
> Reporter: John Zhuge
> Assignee: John Zhuge
> Attachments: YARN-6501.branch-2.001.patch
>
>
> {noformat}
> [ERROR]
> /Users/jzhuge/hadoop-commit/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/fair/FSSchedulerNode.java:[183,18]
> cannot find symbol
> [ERROR] symbol: method
> putIfAbsent(org.apache.hadoop.yarn.api.records.ApplicationAttemptId,org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.FSAppAttempt)
> [ERROR] location: variable appIdToAppMap of type
> java.util.Map<org.apache.hadoop.yarn.api.records.ApplicationAttemptId,org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.FSAppAttempt>
> [ERROR]
> /Users/jzhuge/hadoop-commit/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/fair/FSSchedulerNode.java:[184,29]
> cannot find symbol
> [ERROR] symbol: method
> putIfAbsent(org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.FSAppAttempt,org.apache.hadoop.yarn.api.records.Resource)
> [ERROR] location: variable resourcesPreemptedForApp of type
> java.util.Map<org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.FSAppAttempt,org.apache.hadoop.yarn.api.records.Resource>
> {noformat}
> {{Map#putIfAbsent}} is introduced in JDK8.
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