Github user revans2 commented on a diff in the pull request:
https://github.com/apache/storm/pull/1808#discussion_r96911529
--- Diff:
external/storm-kafka-client/src/main/java/org/apache/storm/kafka/spout/RoundRobinManualPartitioner.java
---
@@ -15,14 +15,26 @@
* See the License for the specific language governing permissions and
* limitations under the License.
*/
+package org.apache.storm.kafka.spout;
-package org.apache.storm.kafka.spout.internal.partition;
+import java.util.ArrayList;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Set;
-import org.apache.kafka.clients.consumer.KafkaConsumer;
import org.apache.kafka.common.TopicPartition;
+import org.apache.storm.task.TopologyContext;
-import java.util.List;
+public class RoundRobinManualPartitioner implements ManualPartitioner {
-public interface KafkaPartitionReader {
- List<TopicPartition> readPartitions(KafkaConsumer<?, ?> consumer);
+ @Override
+ public List<TopicPartition> partition(List<TopicPartition>
allPartitions, TopologyContext context) {
+ int thisTaskIndex = context.getThisTaskIndex();
+ int totalTaskCount =
context.getComponentTasks(context.getThisComponentId()).size();
+ Set<TopicPartition> myPartitions = new
HashSet<>(allPartitions.size()/totalTaskCount+1);
+ for (int i = thisTaskIndex; i < allPartitions.size(); i +=
totalTaskCount) {
--- End diff --
No. `i < allPartitions.size()` guarantees that we will never call get on
allPartitions with an index that is out of bounds. The Set is just setting the
initial size to avoid more memory allocation.
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