Marcus Eriksson created CASSANDRA-19571:
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             Summary: Avoid ConcurrentModificationException when removing 
metrics from CassandraMetricsRegistry
                 Key: CASSANDRA-19571
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-19571
             Project: Cassandra
          Issue Type: Bug
            Reporter: Marcus Eriksson


Multiple threads can modify the lists in {{CassandraMetricsRegistry}} 
{{ALIASES}} map values. We have seen this CME when removing metrics, but could 
possibly affect other paths using those lists

Adding a small delay (10ms) when map:ing to {{getMetricName}} in 
{{CassandraMetricsRegistry.remove(name)}} makes this reproduce when running 
{{TransientRangeMovementTest.testLeave}}

Caused by CASSANDRA-14572



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