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From ctubbsii <>
Subject [GitHub] accumulo pull request #220: ACCUMULO-4591 replication latency metrics added
Date Thu, 23 Feb 2017 02:03:33 GMT
Github user ctubbsii commented on a diff in the pull request:
    --- Diff: server/master/src/main/java/org/apache/accumulo/master/replication/
    @@ -216,4 +220,13 @@ protected long removeRowIfNecessary(BatchWriter bw, SortedMap<Key,Value>
         return recordsRemoved;
    +  /*
    +   * Metrics calls snapshot. Largest time stamp will be found for each snapshot then
    +   */
    +  private void collectLatency(Long createdTime) {
    +    long latency = System.currentTimeMillis() - createdTime;
    --- End diff --
    `System.currentTimeMillis()` is unreliable for tracking time differences, and this subtraction
could even be negative. Use `System.nanoTime()` for time differences/durations. The difference
is guaranteed to be positive.

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