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https://issues.apache.org/jira/browse/HDFS-13873?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16905359#comment-16905359
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Wei-Chiu Chuang commented on HDFS-13873:
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[~xkrogen] [~shv] this commit is now in branch-2.
It imports java.util.concurrent.atomic.LongAccumulator which is only in JDK8,
and so breaks the JDK7 compatibility.
> ObserverNode should reject read requests when it is too far behind.
> -------------------------------------------------------------------
>
> Key: HDFS-13873
> URL: https://issues.apache.org/jira/browse/HDFS-13873
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: hdfs-client, namenode
> Affects Versions: HDFS-12943
> Reporter: Konstantin Shvachko
> Assignee: Konstantin Shvachko
> Priority: Major
> Fix For: HDFS-12943, 3.3.0
>
> Attachments: HDFS-13873-HDFS-12943.001.patch,
> HDFS-13873-HDFS-12943.002.patch, HDFS-13873-HDFS-12943.003.patch,
> HDFS-13873-HDFS-12943.004.patch, HDFS-13873-HDFS-12943.005.patch
>
>
> Add a server-side threshold for ObserverNode to reject read requests when it
> is too far behind.
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