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Avoid intermediate offsets in bucketStart calculation logic to handle DST transition (#15038) 

When moving timestamps by an offset using org.joda.time.chrono.ISOChronology library, if the new timestamp falls in Daylight Savings Time (DST) transition period, the library rounds it off to the nearest valid time. This can lead to incorrect final timestamp when calculated using intermediate offsets landing in DST transition, for e.g. +21D arrived at using +14D and +7D offset, where +14D lands in DST transition period. Since bucketStart values are calculated using this library, this behaviour can lead to incorrect bucketStart times.
This commit is contained in:
Vishesh Garg 2023-10-04 11:32:29 +05:30 committed by GitHub
parent 3342e03ea8
commit 7e8f3e69ef
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2 changed files with 92 additions and 5 deletions
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8
processing/src/main/java/org/apache/druid/java/util/common/granularity/PeriodGranularity.java
View File

@ -250,7 +250,7 @@ public class PeriodGranularity extends Granularity implements JsonSerializable
long tt = chronology.years().add(origin, y);
// always round down to the previous period (for timestamps prior to origin)
if (t < tt) {
t = chronology.years().add(tt, -years);
t = chronology.years().add(origin, y - years);
} else {
t = tt;
}
@ -268,7 +268,7 @@ public class PeriodGranularity extends Granularity implements JsonSerializable
long tt = chronology.months().add(origin, m);
// always round down to the previous period (for timestamps prior to origin)
if (t < tt) {
t = chronology.months().add(tt, -months);
t = chronology.months().add(origin, m - months);
} else {
t = tt;
}
@ -287,7 +287,7 @@ public class PeriodGranularity extends Granularity implements JsonSerializable
long tt = chronology.weeks().add(origin, w);
// always round down to the previous period (for timestamps prior to origin)
if (t < tt) {
t = chronology.weeks().add(tt, -weeks);
t = chronology.weeks().add(origin, w - weeks);
} else {
t = tt;
}
@ -308,7 +308,7 @@ public class PeriodGranularity extends Granularity implements JsonSerializable
long tt = chronology.days().add(origin, d);
// always round down to the previous period (for timestamps prior to origin)
if (t < tt) {
t = chronology.days().add(tt, -days);
t = chronology.days().add(origin, d - days);
} else {
t = tt;
}

87
processing/src/test/java/org/apache/druid/granularity/QueryGranularityTest.java
View File

@ -356,6 +356,93 @@ public class QueryGranularityTest
hour.bucketStart(DateTimes.of("2012-11-04T03:30:00-08:00"))
)
);
final PeriodGranularity p7days = new PeriodGranularity(
new Period("P7D"),
DateTimes.of("2022-03-24T02:35:00.000-07:00"),
tz
);
assertSameDateTime(
Lists.newArrayList(
new DateTime("2022-03-03T02:35:00.000-08:00", tz),
new DateTime("2022-03-10T02:35:00.000-08:00", tz),
new DateTime("2022-03-24T02:35:00.000-07:00", tz),
new DateTime("2022-03-31T02:35:00.000-07:00", tz)
),
Lists.newArrayList(
p7days.bucketStart(DateTimes.of("2022-03-04T02:35:00.000-08:00")),
p7days.bucketStart(DateTimes.of("2022-03-16T02:35:00.000-07:00")),
p7days.bucketStart(DateTimes.of("2022-03-26T02:35:00.000-07:00")),
p7days.bucketStart(DateTimes.of("2022-03-31T03:35:00.000-07:00"))
)
);
final PeriodGranularity week = new PeriodGranularity(
new Period("P1W"),
DateTimes.of("2022-03-24T02:35:00.000-07:00"),
tz
);
assertSameDateTime(
Lists.newArrayList(
new DateTime("2022-03-03T02:35:00.000-08:00", tz),
new DateTime("2022-03-10T02:35:00.000-08:00", tz),
new DateTime("2022-03-24T02:35:00.000-07:00", tz),
new DateTime("2022-03-31T02:35:00.000-07:00", tz)
),
Lists.newArrayList(
week.bucketStart(DateTimes.of("2022-03-04T02:35:00.000-08:00")),
week.bucketStart(DateTimes.of("2022-03-16T02:35:00.000-07:00")),
week.bucketStart(DateTimes.of("2022-03-26T02:35:00.000-07:00")),
week.bucketStart(DateTimes.of("2022-03-31T03:35:00.000-07:00"))
)
);
final PeriodGranularity month = new PeriodGranularity(
new Period("P1M"),
DateTimes.of("2022-03-24T02:35:00.000-07:00"),
tz
);
assertSameDateTime(
Lists.newArrayList(
new DateTime("2022-02-24T02:35:00.000-08:00", tz),
new DateTime("2022-02-24T02:35:00.000-08:00", tz),
new DateTime("2022-03-24T02:35:00.000-07:00", tz),
new DateTime("2022-03-24T02:35:00.000-07:00", tz)
),
Lists.newArrayList(
month.bucketStart(DateTimes.of("2022-03-04T02:35:00.000-08:00")),
month.bucketStart(DateTimes.of("2022-03-16T02:35:00.000-07:00")),
month.bucketStart(DateTimes.of("2022-03-26T02:35:00.000-07:00")),
month.bucketStart(DateTimes.of("2022-03-31T03:35:00.000-07:00"))
)
);
final PeriodGranularity year = new PeriodGranularity(
new Period("P1Y"),
DateTimes.of("2022-03-24T02:35:00.000-07:00"),
tz
);
assertSameDateTime(
Lists.newArrayList(
new DateTime("2021-03-24T02:35:00.000-07:00", tz),
new DateTime("2021-03-24T02:35:00.000-07:00", tz),
new DateTime("2022-03-24T02:35:00.000-07:00", tz),
new DateTime("2022-03-24T02:35:00.000-07:00", tz)
),
Lists.newArrayList(
year.bucketStart(DateTimes.of("2022-03-04T02:35:00.000-08:00")),
year.bucketStart(DateTimes.of("2022-03-16T02:35:00.000-07:00")),
year.bucketStart(DateTimes.of("2022-03-26T02:35:00.000-07:00")),
year.bucketStart(DateTimes.of("2022-03-31T03:35:00.000-07:00"))
)
);
}
@Test