b-slim commented on a change in pull request #665: HIVE-21832: New metrics to
get the average queue/serving/response time
URL: https://github.com/apache/hive/pull/665#discussion_r291656149
##########
File path:
llap-server/src/java/org/apache/hadoop/hive/llap/metrics/LlapDaemonExecutorMetrics.java
##########
@@ -195,14 +202,22 @@ private LlapDaemonExecutorMetrics(String displayName,
JvmMetrics jm, String sess
this.executorThreadUserTime[i] = registry.newGauge(miu, 0L);
this.executorNames.put(ContainerRunnerImpl.THREAD_NAME_FORMAT_PREFIX +
i, i);
}
+ if (simpleAverageWindowDataSize > 0) {
+ this.queueTime = new
SynchronizedDescriptiveStatistics(simpleAverageWindowDataSize);
Review comment:
took quick look at the implementation of `SynchronizedDescriptiveStatistics`
and i see synchronized everywhere,
maybe be this is not an issue yet but i can see how it can be become an
issue in the future as a source of contentions, wondering if we can use a
longAdder to compute ourself the the average, that should be lock free and will
probably spread the contention.
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