GWphua commented on code in PR #18477:
URL: https://github.com/apache/druid/pull/18477#discussion_r2328603280
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processing/src/main/java/org/apache/druid/java/util/common/Intervals.java:
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@@ -25,13 +25,17 @@
import org.joda.time.DateTime;
import org.joda.time.Interval;
import org.joda.time.chrono.ISOChronology;
+import org.joda.time.format.DateTimeFormatter;
+import org.joda.time.format.ISODateTimeFormat;
import javax.annotation.Nullable;
public final class Intervals
{
public static final Interval ETERNITY = utc(JodaUtils.MIN_INSTANT,
JodaUtils.MAX_INSTANT);
public static final ImmutableList<Interval> ONLY_ETERNITY =
ImmutableList.of(ETERNITY);
+ private static final DateTimeFormatter FAST_ISO_UTC_FORMATTER =
Review Comment:
Hi @kfaraz
Got quite a bit of time to kill, so I did a benchmark for the formatters...
Seems `DateTimes.ISO_DATE_TIME` is a bit slower than the current
optimization because `ISO_DATE_TIME` tries to create `DateTime` unnecessary
objects. The current implementation creates an `Interval` directly using `long`
via`Intervals#utc` and hence performs faster.
On the topic of using other data formats, seems like we can look for
`DateTimes.ISO_DATE_OPTIONAL_TIME` to improve the deserialization, but the
improvement is quite small.
```
Benchmark
(numValues) Mode Cnt Score Error Units
JodaIntervalDeserializationBenchmark.deserializeLegacy
20000 avgt 50 20.858 ± 0.035 ms/op
JodaIntervalDeserializationBenchmark.deserializeOptimized
20000 avgt 50 11.940 ± 0.009 ms/op
JodaIntervalDeserializationBenchmark.deserializeDateTime
20000 avgt 50 12.524 ± 0.025 ms/op
JodaIntervalDeserializationBenchmark.deserializeDateTimeOffset
20000 avgt 50 23.505 ± 0.050 ms/op
JodaIntervalDeserializationBenchmark.deserializeOptionalDateTime
20000 avgt 50 20.663 ± 0.111 ms/op
JodaIntervalDeserializationBenchmark.deserializeLegacyFallback
20000 avgt 50 19.035 ± 0.032 ms/op
JodaIntervalDeserializationBenchmark.deserializeOptimizedFallback
20000 avgt 50 33.782 ± 0.105 ms/op
JodaIntervalDeserializationBenchmark.deserializeDateTimeFallback
20000 avgt 50 36.642 ± 0.065 ms/op
JodaIntervalDeserializationBenchmark.deserializeDateTimeOffsetFallback
20000 avgt 50 22.067 ± 0.046 ms/op
JodaIntervalDeserializationBenchmark.deserializeOptionalDateTimeFallback
20000 avgt 50 18.861 ± 0.012 ms/op
```
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