add a test

Author: yujun777

fe/fe-common/src/main/java/org/apache/doris/common/Config.java

@@ -2533,6 +2533,12 @@ public class Config extends ConfigBase {
     })
     public static long analyze_record_limit = 20000;
 
+    @ConfField(mutable = true, masterOnly = true, description = {
+            "Auto Buckets中预估的压缩数据的倍率",
+            "the estimated compress factor of partition size in Auto Buckets"
+    })
+    public static int autobucket_compress_size_factor = 5;
+
     @ConfField(mutable = true, masterOnly = true, description = {
             "Auto Buckets中最小的buckets数目",
             "min buckets of auto bucket"

fe/fe-core/src/main/java/org/apache/doris/clone/DynamicPartitionScheduler.java

@@ -234,7 +234,9 @@ private static int getBucketsNum(DynamicPartitionProperty property, OlapTable ta
                 .collect(Collectors.toCollection(ArrayList::new));
         long estimatePartitionSize = getNextPartitionSize(partitionSizeArray);
         // plus 5 for uncompressed data
-        long uncompressedPartitionSize = estimatePartitionSize * 5;
+        // replica's actual disk usage is a litter bigger then its reported data size
+        // but 5 times maybe a little too big, i don't known why use so big. just add a config here.
+        long uncompressedPartitionSize = estimatePartitionSize * Config.autobucket_compress_size_factor;
         int bucketsNum = AutoBucketUtils.getBucketsNum(uncompressedPartitionSize, Config.autobucket_min_buckets);
         LOG.info("autobucket calc with {} history partitions, table: [{}-{}], partition: {}, buckets num: {}, "
                 + " estimate partition size: {}, last partitions(partition name, local size, remote size): {}",

fe/fe-core/src/test/java/org/apache/doris/catalog/DynamicPartitionTableTest.java

@@ -1771,16 +1771,16 @@ public void testAutoBuckets() throws Exception {
                 Partition partition = partitions.get(i);
                 partition.updateVisibleVersion(2L);
                 for (MaterializedIndex idx : partition.getMaterializedIndices(
-                    MaterializedIndex.IndexExtState.VISIBLE)) {
+                        MaterializedIndex.IndexExtState.VISIBLE)) {
                     for (Tablet tablet : idx.getTablets()) {
                         for (Replica replica : tablet.getReplicas()) {
                             replica.updateVersion(2L);
                             replica.setDataSize(i < 40 ? 0L : 20L << 30);
                             replica.setRowCount(1000L);
                         }
                     }
-               }
-           }
+                }
+            }
         } finally {
             table.readUnlock();
         }