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https://issues.apache.org/jira/browse/HDFS-14724?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16905386#comment-16905386
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He Xiaoqiao commented on HDFS-14724:
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[~jojochuang],[~xkrogen], just check {{HATestUtil}} which is unused import.
Should we remove it directly? Please correct me if miss something.
> Fix JDK7 compatibility in branch-2
> ----------------------------------
>
> Key: HDFS-14724
> URL: https://issues.apache.org/jira/browse/HDFS-14724
> Project: Hadoop HDFS
> Issue Type: Bug
> Affects Versions: 2.10.0
> Reporter: Wei-Chiu Chuang
> Priority: Blocker
>
> With the feature Consistent Read from Standby now in branch-2, I found it
> breaks the build when building with JDK7, because it uses
> java.util.concurrent.atomic.LongAccumulator which is only in JDK8 and above.
>
> We should figure out if we want to fix it, or give up JDK7 compatibility.
> [~xkrogen] [~shv] [~vagarychen]
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