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https://issues.apache.org/jira/browse/HDFS-16042?focusedWorklogId=602549&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-602549
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ASF GitHub Bot logged work on HDFS-16042:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 26/May/21 20:27
Start Date: 26/May/21 20:27
Worklog Time Spent: 10m
Work Description: amahussein opened a new pull request #3058:
URL: https://github.com/apache/hadoop/pull/3058
[HDFS-16042](https://issues.apache.org/jira/browse/HDFS-16042)
DatanodeAdminMonitor scan should be delay based.
In DatanodeAdminManager.activate(), the Monitor task is scheduled with a
fixed rate, ie. the period is from start1 -> start2.
It should be a fixed delay so it's end1 -> start1.
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Issue Time Tracking
-------------------
Worklog Id: (was: 602549)
Remaining Estimate: 0h
Time Spent: 10m
> DatanodeAdminMonitor scan should be delay based
> -----------------------------------------------
>
> Key: HDFS-16042
> URL: https://issues.apache.org/jira/browse/HDFS-16042
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: datanode
> Reporter: Ahmed Hussein
> Assignee: Ahmed Hussein
> Priority: Major
> Time Spent: 10m
> Remaining Estimate: 0h
>
> In {{DatanodeAdminManager.activate()}}, the Monitor task is scheduled with a
> fixed rate, ie. the period is from start1 -> start2.
> {code:java}
> executor.scheduleAtFixedRate(monitor, intervalSecs, intervalSecs,
> TimeUnit.SECONDS);
> {code}
> According to Java API docs for {{scheduleAtFixedRate}},
> {quote}If any execution of this task takes longer than its period, then
> subsequent executions may start late, but will not concurrently
> execute.{quote}
> It should be a fixed delay so it's end1 -> start1.
>
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