wjhypo commented on a change in pull request #9810:
URL: https://github.com/apache/druid/pull/9810#discussion_r462085471
##########
File path:
core/src/main/java/org/apache/druid/timeline/partition/HashBasedNumberedShardSpec.java
##########
@@ -90,10 +98,39 @@ public int getNumBuckets()
return partitionDimensions;
}
+ @Override
+ public List<String> getDomainDimensions()
+ {
+ return partitionDimensions;
+ }
+
@Override
public boolean isInChunk(long timestamp, InputRow inputRow)
{
- return (((long) hash(timestamp, inputRow)) - bucketId) % numBuckets == 0;
+ return Math.abs(hash(timestamp, inputRow) % numBuckets) == bucketId %
numBuckets;
+ }
+
+ /**
+ * Check if the current segment possibly holds records if the values of
dimensions in {@link #partitionDimensions}
+ * are of {@code partitionDimensionsValues}
+ *
+ * @param partitionDimensionsValues An instance of values of dimensions in
{@link #partitionDimensions}
+ *
+ * @return Whether the current segment possibly holds records for the given
values of partition dimensions
+ */
+ private boolean isInChunk(Map<String, String> partitionDimensionsValues)
+ {
+ assert !partitionDimensions.isEmpty();
+ List<Object> groupKey = Lists.transform(
+ partitionDimensions,
+ o -> Collections.singletonList(partitionDimensionsValues.get(o))
+ );
+ try {
+ return Math.abs(hash(jsonMapper, groupKey) % numBuckets) == bucketId %
numBuckets;
Review comment:
Good call! Changed. Actually I have to extract only `Math.abs(hash %
numBuckets)` because in the function used by ingestion `static ShardSpecLookup
createHashLookup` only needs `Math.abs(hash % numBuckets)` instead of the whole
statement you mentioned.
##########
File path:
core/src/main/java/org/apache/druid/timeline/partition/HashBasedNumberedShardSpec.java
##########
@@ -192,4 +229,71 @@ public String toString()
", partitionDimensions=" + partitionDimensions +
'}';
}
+
+ @Override
+ public boolean possibleInDomain(Map<String, RangeSet<String>> domain)
+ {
+ // If no partitionDimensions are specified during ingestion, hash is based
on all dimensions plus the truncated
+ // input timestamp according to QueryGranularity instead of just
partitionDimensions. Since we don't store the
+ // timestamp after ingestion, bypass this case
Review comment:
Oh, I mean in the shard spec, we don't store truncated timestamps of the
events that fall into the shard. I've rephrased it. Let me know if it makes
sense or needs more clarification.
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