accumulo-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From keith-turner <>
Subject [GitHub] accumulo pull request #220: ACCUMULO-4591 replication latency metrics added
Date Thu, 23 Feb 2017 17:50:39 GMT
Github user keith-turner 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 --
    I looked into this a bit more to see if using nanoTime would be reasonable across processes.
 The following is from the nanoTime javaodc
    Returns the current value of the running Java Virtual Machine's high-resolution time source,
in nanoseconds. This method can only be used to measure elapsed time and is not related to
any other notion of system or wall-clock time.
    Given this documentation, if the times are persisted and used across multiple processes
then I think using `nanoTime()` would be inappropriate. 

If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at or file a JIRA ticket
with INFRA.

View raw message