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https://issues.apache.org/jira/browse/DRILL-4779?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16260775#comment-16260775
]
ASF GitHub Bot commented on DRILL-4779:
---------------------------------------
Github user kameshb commented on a diff in the pull request:
https://github.com/apache/drill/pull/1027#discussion_r152285907
--- Diff:
contrib/storage-kafka/src/main/java/org/apache/drill/exec/store/kafka/KafkaRecordReader.java
---
@@ -0,0 +1,145 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.drill.exec.store.kafka;
+
+import java.util.Collection;
+import java.util.List;
+import java.util.Set;
+import java.util.concurrent.TimeUnit;
+
+import org.apache.drill.common.exceptions.ExecutionSetupException;
+import org.apache.drill.common.exceptions.UserException;
+import org.apache.drill.common.expression.SchemaPath;
+import org.apache.drill.exec.ExecConstants;
+import org.apache.drill.exec.ops.FragmentContext;
+import org.apache.drill.exec.ops.OperatorContext;
+import org.apache.drill.exec.physical.impl.OutputMutator;
+import org.apache.drill.exec.server.options.OptionManager;
+import org.apache.drill.exec.store.AbstractRecordReader;
+import org.apache.drill.exec.store.kafka.KafkaSubScan.KafkaSubScanSpec;
+import org.apache.drill.exec.store.kafka.decoders.MessageReader;
+import org.apache.drill.exec.store.kafka.decoders.MessageReaderFactory;
+import org.apache.drill.exec.util.Utilities;
+import org.apache.drill.exec.vector.complex.impl.VectorContainerWriter;
+import org.apache.kafka.clients.consumer.ConsumerRecord;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import com.google.common.base.Stopwatch;
+import com.google.common.collect.Lists;
+import com.google.common.collect.Sets;
+
+public class KafkaRecordReader extends AbstractRecordReader {
+ private static final Logger logger =
LoggerFactory.getLogger(KafkaRecordReader.class);
+ public static final long DEFAULT_MESSAGES_PER_BATCH = 4000;
+
+ private VectorContainerWriter writer;
+ private MessageReader messageReader;
+
+ private final boolean unionEnabled;
+ private final KafkaStoragePlugin plugin;
+ private final KafkaSubScanSpec subScanSpec;
+ private final long kafkaPollTimeOut;
+
+ private long currentOffset;
+ private MessageIterator msgItr;
+
+ private final boolean enableAllTextMode;
+ private final boolean readNumbersAsDouble;
+ private final String kafkaMsgReader;
+
+ public KafkaRecordReader(KafkaSubScan.KafkaSubScanSpec subScanSpec,
List<SchemaPath> projectedColumns,
+ FragmentContext context, KafkaStoragePlugin plugin) {
+ setColumns(projectedColumns);
+ this.enableAllTextMode =
context.getOptions().getOption(ExecConstants.KAFKA_ALL_TEXT_MODE).bool_val;
+ this.readNumbersAsDouble = context.getOptions()
+
.getOption(ExecConstants.KAFKA_READER_READ_NUMBERS_AS_DOUBLE).bool_val;
+ OptionManager options = context.getOptions();
+ this.unionEnabled = options.getOption(ExecConstants.ENABLE_UNION_TYPE);
+ this.kafkaMsgReader =
options.getOption(ExecConstants.KAFKA_RECORD_READER).string_val;
+ this.kafkaPollTimeOut =
options.getOption(ExecConstants.KAFKA_POLL_TIMEOUT).num_val;
+ this.plugin = plugin;
+ this.subScanSpec = subScanSpec;
+ }
+
+ @Override
+ protected Collection<SchemaPath> transformColumns(Collection<SchemaPath>
projectedColumns) {
+ Set<SchemaPath> transformed = Sets.newLinkedHashSet();
+ if (!isStarQuery()) {
+ for (SchemaPath column : projectedColumns) {
+ transformed.add(column);
+ }
+ } else {
+ transformed.add(Utilities.STAR_COLUMN);
+ }
+ return transformed;
+ }
+
+ @Override
+ public void setup(OperatorContext context, OutputMutator output) throws
ExecutionSetupException {
+ this.writer = new VectorContainerWriter(output, unionEnabled);
+ messageReader = MessageReaderFactory.getMessageReader(kafkaMsgReader);
+ messageReader.init(context.getManagedBuffer(),
Lists.newArrayList(getColumns()), this.writer,
+ this.enableAllTextMode, this.readNumbersAsDouble);
+ msgItr = new MessageIterator(messageReader.getConsumer(plugin),
subScanSpec, kafkaPollTimeOut);
+ }
+
+ /**
+ * KafkaConsumer.poll will fetch 500 messages per poll call. So hasNext
will
+ * take care of polling multiple times for this given batch next
invocation
+ */
+ @Override
+ public int next() {
+ writer.allocate();
+ writer.reset();
+ Stopwatch watch = Stopwatch.createStarted();
+ int messageCount = 0;
+
+ try {
+ while (currentOffset < subScanSpec.getEndOffset() - 1 &&
msgItr.hasNext()) {
+ ConsumerRecord<byte[], byte[]> consumerRecord = msgItr.next();
+ currentOffset = consumerRecord.offset();
+ writer.setPosition(messageCount);
+ messageReader.readMessage(consumerRecord);
+ if (++messageCount >= DEFAULT_MESSAGES_PER_BATCH) {
+ break;
+ }
+ }
+
+ messageReader.ensureAtLeastOneField();
+ writer.setValueCount(messageCount);
+ logger.debug("Took {} ms to process {} records.",
watch.elapsed(TimeUnit.MILLISECONDS), messageCount);
+ logger.debug("Last offset consumed for {}:{} is {}",
subScanSpec.getTopicName(), subScanSpec.getPartitionId(),
+ currentOffset);
+ return messageCount;
+ } catch (Exception e) {
+ String msg = "Failure while reading messages from kafka.
Recordreader was at record: " + (messageCount + 1);
+ throw
UserException.dataReadError(e).message(msg).addContext(e.getMessage()).build(logger);
+ }
+ }
+
+ @Override
+ public void close() throws Exception {
+ logger.info("Last offset processed for {}:{} is - {}",
subScanSpec.getTopicName(), subScanSpec.getPartitionId(),
--- End diff --
This would help while debugging if there any issues. That is the reason why
made it info and most of other are logged as debug.
> Kafka storage plugin support
> ----------------------------
>
> Key: DRILL-4779
> URL: https://issues.apache.org/jira/browse/DRILL-4779
> Project: Apache Drill
> Issue Type: New Feature
> Components: Storage - Other
> Affects Versions: 1.11.0
> Reporter: B Anil Kumar
> Assignee: B Anil Kumar
> Labels: doc-impacting
> Fix For: 1.12.0
>
>
> Implement Kafka storage plugin will enable the strong SQL support for Kafka.
> Initially implementation can target for supporting json and avro message types
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