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https://issues.apache.org/jira/browse/DRILL-7388?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16976464#comment-16976464
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ASF GitHub Bot commented on DRILL-7388:
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arina-ielchiieva commented on pull request #1901: DRILL-7388: Kafka improvements
URL: https://github.com/apache/drill/pull/1901
Jira - [DRILL-7388](https://issues.apache.org/jira/browse/DRILL-7388).
1. Upgraded Kafka libraries to 2.3.1 (DRILL-6739).
2. Added new options to support the same features as native JSON reader:
a. store.kafka.reader.skip_invalid_records, default: false (DRILL-6723);
b. store.kafka.reader.allow_nan_inf, default: true;
c. store.kafka.reader.allow_escape_any_char, default: false.
3. Fixed issue when Kafka topic contains only one message (DRILL-7388).
4. Replaced Gson parser with Jackson to parse JSON in the same manner as
Drill native Json reader.
5. Performance improvements: Kafka consumers will be closed async, fixed
issue with resource leak (DRILL-7290), moved to debug unnecessary info logging.
6. Updated bootstrap-storage-plugins.json to reflect actual Kafka connection
properties.
7. Added unit tests.
8. Refactoring and code clean up.
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> Apache Drill Kafka Storage module fails to return results for partitions
> containing single offset record
> --------------------------------------------------------------------------------------------------------
>
> Key: DRILL-7388
> URL: https://issues.apache.org/jira/browse/DRILL-7388
> Project: Apache Drill
> Issue Type: Bug
> Affects Versions: 1.16.0
> Reporter: daniel kelly
> Assignee: Arina Ielchiieva
> Priority: Major
> Fix For: 1.17.0
>
>
> If a partition only contains one record - e.g.
> [topicName=myTopic, partitionId=117, startOffset=0, endOffset=1]
> no data is returned.
> I fixed this locally with the following code change in contrib/storage-kafka
> :-
> {code:java}
> git diff
> src/main/java/org/apache/drill/exec/store/kafka/KafkaRecordReader.java
> @@ -109,7 +109,7 @@ public class KafkaRecordReader extends
> AbstractRecordReader {
> currentMessageCount = 0;
>
> try {
> - while (currentOffset < subScanSpec.getEndOffset() - 1 &&
> msgItr.hasNext()) {
> + while (currentOffset < subScanSpec.getEndOffset() && msgItr.hasNext())
> {
> ConsumerRecord<byte[], byte[]> consumerRecord = msgItr.next();
> {code}
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