warnings in the cassandra log about compacting large partitions

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Issue

WARN messages similar to

WARN  [CompactionExecutor:7] 2018-07-04 13:44:39,795 BigTableWriter.java:171 - Writing large partition hawkular_metrics/metrics_tags_idx:<env>:namespace_name (801723271 bytes to sstable /cassandra_data/data/hawkular_metrics/metrics_tags_idx-xxx/xxx.db)

Unbounded growth of tags index prevents graphs from rendering

Environment

OpenShift Container Platform 3.6

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