[HDDS-1870] ConcurrentModification at PrometheusMetricsSink

• Type: Bug
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 0.5.0
• Labels: pull-request-available
• Target Version/s: 0.5.0
• Assignee: Attila Doroszlai
• Reporter: Attila Doroszlai
• Created: 29/Jul/19 09:59
• Updated: 24/Feb/20 20:51
• Resolved: 04/Aug/19 05:26

Description

Encountered on ozoneperf compose env when running low on CPU:

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)

Issue Links

• is related to: HADOOP-16496 Apply HDDS-1870 (ConcurrentModification at PrometheusMetricsSink) to Hadoop common
• links to: GitHub Pull Request #1179