Github user joshelser commented on a diff in the pull request:
https://github.com/apache/accumulo/pull/220#discussion_r102820537
--- Diff:
server/master/src/main/java/org/apache/accumulo/master/metrics/Metrics2ReplicationMetrics.java
---
@@ -58,6 +59,7 @@ protected void snapshot() {
registry.add(PENDING_FILES, getNumFilesPendingReplication());
registry.add(NUM_PEERS, getNumConfiguredPeers());
registry.add(MAX_REPLICATION_THREADS, getMaxReplicationThreads());
+ registry.add(LATENCY, getLatencyInSeconds());
--- End diff --
Ah, crap. It looks like I was confusing what exists in other Metrics
libraries as primitives.
Hadoop Metrics2 supports gauges, counters, stats and quantiles. You would
want to create `MutableQuantiles` and some `MutableGauges` from the
`MetricsRegistry`. You can maintain the min, median, avg, and max as gauges,
and then present the percentiles using the quantiles. Essentially, you'd have
to track both separately. Like you have here, you could just instrument this
class to compute the current metrics instead of doing it "in-band" in `RCRR`.
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