Github user cestella commented on the issue:
https://github.com/apache/incubator-metron/pull/234
The AccessTracker allows us to track which keys in the hbase table are
accessed. This is so that pruning an be done based on most current usage. It
is used in the exisiting HBase Enrichment/ThreatIntel bolt, so it's being
continued to be used here. There are two access trackers currently setup, one
is a noop, which is the default. The other one is to capture the key being
accessed in a bloom filter and write the filter out to HBase periodically. The
`threatintel_bulk_pruner.sh` uses this table for pruning infrequently used rows.
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