jtuglu1 commented on code in PR #18866:
URL: https://github.com/apache/druid/pull/18866#discussion_r2643650156
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server/src/main/java/org/apache/druid/segment/realtime/appenderator/StreamAppenderator.java:
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@@ -748,14 +750,15 @@ public Object call() throws IOException
}
finally {
metrics.incrementNumPersists();
Review Comment:
nit: can we move the increments below the time-sensitive metric emissions?
Given we are reporting at nano-scale, chance of interrupt and/or delay due to
atomic load+store can skew the nano count by X-XXns.
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server/src/main/java/org/apache/druid/segment/realtime/appenderator/StreamAppenderator.java:
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@@ -991,8 +998,8 @@ private DataSegmentWithMetadata mergeAndPush(
identifier,
segment.getSize(),
indexes.size(),
- (mergeFinishTime - startTime) / 1000000,
Review Comment:
👍 We should probably make sure this is not being done elsewhere. For future
readers, `System.nanoTime()` is actually more expensive than
`System.getCurrentTimeMillis()` so if you need milli-level precision, just use
the latter from the start.
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