Do not allocate week granular segments unless requested

examples/quickstart/tutorial/rollup-index.json

@@ -20,7 +20,7 @@
       ],
       "granularitySpec" : {
         "type" : "uniform",
-        "segmentGranularity" : "week",
+        "segmentGranularity" : "day",
         "queryGranularity" : "minute",
         "intervals" : ["2018-01-01/2018-01-03"],
         "rollup" : true

examples/quickstart/tutorial/transform-index.json

@@ -20,7 +20,7 @@
       ],
       "granularitySpec" : {
         "type" : "uniform",
-        "segmentGranularity" : "week",
+        "segmentGranularity" : "day",
         "queryGranularity" : "minute",
         "intervals" : ["2018-01-01/2018-01-03"],
         "rollup" : true

examples/quickstart/tutorial/updates-append-index.json

@@ -18,7 +18,7 @@
       ],
       "granularitySpec": {
         "type": "uniform",
-        "segmentGranularity": "week",
+        "segmentGranularity": "day",
         "queryGranularity": "minute",
         "intervals": ["2018-01-01/2018-01-03"],
         "rollup": true

examples/quickstart/tutorial/updates-append-index2.json

@@ -18,7 +18,7 @@
       ],
       "granularitySpec" : {
         "type" : "uniform",
-        "segmentGranularity" : "week",
+        "segmentGranularity" : "day",
         "queryGranularity" : "minute",
         "intervals" : ["2018-01-01/2018-01-03"],
         "rollup" : true

examples/quickstart/tutorial/updates-init-index.json

@@ -18,7 +18,7 @@
       ],
       "granularitySpec" : {
         "type" : "uniform",
-        "segmentGranularity" : "week",
+        "segmentGranularity" : "day",
         "queryGranularity" : "minute",
         "intervals" : ["2018-01-01/2018-01-03"],
         "rollup" : true

examples/quickstart/tutorial/updates-overwrite-index.json

@@ -18,7 +18,7 @@
       ],
       "granularitySpec" : {
         "type" : "uniform",
-        "segmentGranularity" : "week",
+        "segmentGranularity" : "day",
         "queryGranularity" : "minute",
         "intervals" : ["2018-01-01/2018-01-03"],
         "rollup" : true

indexing-service/src/main/java/org/apache/druid/indexing/common/actions/SegmentAllocateAction.java

@@ -52,16 +52,22 @@
 import java.util.stream.Collectors;
 
 /**
- * Allocates a pending segment for a given timestamp. The preferredSegmentGranularity is used if there are no prior
- * segments for the given timestamp, or if the prior segments for the given timestamp are already at the
- * preferredSegmentGranularity. Otherwise, the prior segments will take precedence.
+ * Allocates a pending segment for a given timestamp.
+ * If a visible chunk of used segments contains the interval with the query granularity containing the timestamp,
+ * the pending segment is allocated with its interval.
+ * Else, if the interval with the preferred segment granularity containing the timestamp has no overlap
+ * with the existing used segments, the preferred segment granularity is used.
+ * Else, find the coarsest segment granularity, containing the interval with the query granularity for the timestamp,
+ * that does not overlap with the existing used segments. This granularity is used for allocation if it exists.
  * <p/>
  * This action implicitly acquires some task locks when it allocates segments. You do not have to acquire them
  * beforehand, although you *do* have to release them yourself. (Note that task locks are automatically released when
  * the task is finished.)
  * <p/>
  * If this action cannot acquire an appropriate task lock, or if it cannot expand an existing segment set, it returns
  * null.
+ * </p>
+ * Do NOT allocate WEEK granularity segments unless the preferred segment granularity is WEEK.
  */
 public class SegmentAllocateAction implements TaskAction<SegmentIdWithShardSpec>
 {

indexing-service/src/test/java/org/apache/druid/indexing/common/actions/SegmentAllocateActionTest.java

@@ -59,6 +59,7 @@
 import org.junit.runners.Parameterized;
 
 import java.io.IOException;
+import java.time.Duration;
 import java.util.Collections;
 import java.util.HashMap;
 import java.util.List;
@@ -995,6 +996,66 @@ public void testAllocateAllGranularity()
     Assert.assertEquals(Intervals.ETERNITY, id2.getInterval());
   }
 
+  @Test
+  public void testAllocateWeekOnlyWhenWeekIsPreferred()
+  {
+    final Task task = NoopTask.create();
+    taskActionTestKit.getTaskLockbox().add(task);
+
+    final SegmentIdWithShardSpec id1 = allocate(
+        task,
+        DateTimes.of("2023-12-16"),
+        Granularities.MINUTE,
+        Granularities.HOUR,
+        "s1",
+        null
+    );
+
+    final SegmentIdWithShardSpec id2 = allocate(
+        task,
+        DateTimes.of("2023-12-18"),
+        Granularities.MINUTE,
+        Granularities.WEEK,
+        "s2",
+        null
+    );
+
+    Assert.assertNotNull(id1);
+    Assert.assertNotNull(id2);
+    Assert.assertEquals(Duration.ofHours(1).toMillis(), id1.getInterval().toDurationMillis());
+    Assert.assertEquals(Duration.ofDays(7).toMillis(), id2.getInterval().toDurationMillis());
+  }
+
+  @Test
+  public void testAllocateDayWhenMonthNotPossible()
+  {
+    final Task task = NoopTask.create();
+    taskActionTestKit.getTaskLockbox().add(task);
+
+    final SegmentIdWithShardSpec id1 = allocate(
+        task,
+        DateTimes.of("2023-12-16"),
+        Granularities.MINUTE,
+        Granularities.HOUR,
+        "s1",
+        null
+    );
+
+    final SegmentIdWithShardSpec id2 = allocate(
+        task,
+        DateTimes.of("2023-12-18"),
+        Granularities.MINUTE,
+        Granularities.MONTH,
+        "s2",
+        null
+    );
+
+    Assert.assertNotNull(id1);
+    Assert.assertNotNull(id2);
+    Assert.assertEquals(Duration.ofHours(1).toMillis(), id1.getInterval().toDurationMillis());
+    Assert.assertEquals(Duration.ofDays(1).toMillis(), id2.getInterval().toDurationMillis());
+  }
+
   private SegmentIdWithShardSpec allocate(
       final Task task,
       final DateTime timestamp,

processing/src/main/java/org/apache/druid/java/util/common/granularity/Granularity.java

@@ -106,6 +106,8 @@ public static Granularity mergeGranularities(List<Granularity> toMerge)
    * ALL will not be returned unless the provided granularity is ALL. NONE will never be returned, even if the
    * provided granularity is NONE. This is because the main usage of this function in production is segment
    * allocation, and we do not wish to generate NONE-granular segments.
+   *
+   * The list of granularities returned contains WEEK only if the requested granularity is WEEK.
    */
   public static List<Granularity> granularitiesFinerThan(final Granularity gran0)
   {
@@ -117,6 +119,9 @@ public static List<Granularity> granularitiesFinerThan(final Granularity gran0)
       if ((gran == GranularityType.ALL && !gran0.equals(Granularities.ALL)) || gran == GranularityType.NONE) {
         continue;
       }
+      if (gran == GranularityType.WEEK && !gran0.equals(Granularities.WEEK)) {
+        continue;
+      }
       final Granularity segmentGranularity = gran.create(origin, tz);
       final long segmentGranularityDurationMillis = segmentGranularity.bucket(DateTimes.EPOCH).toDurationMillis();
       final long gran0DurationMillis = gran0.bucket(DateTimes.EPOCH).toDurationMillis();

processing/src/test/java/org/apache/druid/java/util/common/GranularityTest.java

@@ -1002,6 +1002,27 @@ public void testGranularitiesFinerThanHour()
     );
   }
 
+  @Test
+  public void testGranularitiesFinerThanWeek()
+  {
+    Assert.assertEquals(
+        ImmutableList.of(
+            Granularities.WEEK,
+            Granularities.DAY,
+            Granularities.EIGHT_HOUR,
+            Granularities.SIX_HOUR,
+            Granularities.HOUR,
+            Granularities.THIRTY_MINUTE,
+            Granularities.FIFTEEN_MINUTE,
+            Granularities.TEN_MINUTE,
+            Granularities.FIVE_MINUTE,
+            Granularities.MINUTE,
+            Granularities.SECOND
+        ),
+        Granularity.granularitiesFinerThan(Granularities.WEEK)
+    );
+  }
+
   @Test
   public void testGranularitiesFinerThanAll()
   {
@@ -1011,7 +1032,6 @@ public void testGranularitiesFinerThanAll()
             Granularities.YEAR,
             Granularities.QUARTER,
             Granularities.MONTH,
-            Granularities.WEEK,
             Granularities.DAY,
             Granularities.EIGHT_HOUR,
             Granularities.SIX_HOUR,