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https://issues.apache.org/jira/browse/HDDS-1870?focusedWorklogId=284167&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-284167
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ASF GitHub Bot logged work on HDDS-1870:
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Author: ASF GitHub Bot
Created on: 29/Jul/19 10:55
Start Date: 29/Jul/19 10:55
Worklog Time Spent: 10m
Work Description: adoroszlai commented on pull request #1179: HDDS-1870.
ConcurrentModification at PrometheusMetricsSink
URL: https://github.com/apache/hadoop/pull/1179
## What changes were proposed in this pull request?
1. Fix `ConcurrentModification` due to plain `HashMap`
2. Improve string building a bit
https://issues.apache.org/jira/browse/HDDS-1870
## How was this patch tested?
Ran freon in `ozoneperf` env. Checked `/prom` endpoints. Verified that no
CME appears in logs.
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Issue Time Tracking
-------------------
Worklog Id: (was: 284167)
Time Spent: 10m
Remaining Estimate: 0h
> ConcurrentModification at PrometheusMetricsSink
> -----------------------------------------------
>
> Key: HDDS-1870
> URL: https://issues.apache.org/jira/browse/HDDS-1870
> Project: Hadoop Distributed Data Store
> Issue Type: Bug
> Reporter: Doroszlai, Attila
> Assignee: Doroszlai, Attila
> Priority: Minor
> Labels: pull-request-available
> Time Spent: 10m
> Remaining Estimate: 0h
>
> Encountered on {{ozoneperf}} compose env when running low on CPU:
> {code}
> om_1 | java.util.ConcurrentModificationException
> om_1 | at
> java.base/java.util.HashMap$HashIterator.nextNode(HashMap.java:1493)
> om_1 | at
> java.base/java.util.HashMap$ValueIterator.next(HashMap.java:1521)
> om_1 | at
> org.apache.hadoop.hdds.server.PrometheusMetricsSink.writeMetrics(PrometheusMetricsSink.java:123)
> om_1 | at
> org.apache.hadoop.hdds.server.PrometheusServlet.doGet(PrometheusServlet.java:43)
> {code}
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