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Posted to commits@pinot.apache.org by ja...@apache.org on 2019/05/17 04:25:33 UTC
[incubator-pinot] branch master updated: Add
SimpleAvroMessageDecoder which allows passing in Avro schema directly
(#4197)
This is an automated email from the ASF dual-hosted git repository.
jackie pushed a commit to branch master
in repository https://gitbox.apache.org/repos/asf/incubator-pinot.git
The following commit(s) were added to refs/heads/master by this push:
new 3e6733f Add SimpleAvroMessageDecoder which allows passing in Avro schema directly (#4197)
3e6733f is described below
commit 3e6733f820d8f3b0482849abe6e1705da38e18a9
Author: Xiaotian (Jackie) Jiang <17...@users.noreply.github.com>
AuthorDate: Thu May 16 21:25:27 2019 -0700
Add SimpleAvroMessageDecoder which allows passing in Avro schema directly (#4197)
For cases where users have avro encoded msg in kafka but not yet setup a schema service to fetch schema on the fly.
Initial Contributor: fx19880617
---
.../impl/kafka/SimpleAvroMessageDecoder.java | 84 ++++++++++++++++++++++
1 file changed, 84 insertions(+)
diff --git a/pinot-core/src/main/java/org/apache/pinot/core/realtime/impl/kafka/SimpleAvroMessageDecoder.java b/pinot-core/src/main/java/org/apache/pinot/core/realtime/impl/kafka/SimpleAvroMessageDecoder.java
new file mode 100644
index 0000000..b3417f4
--- /dev/null
+++ b/pinot-core/src/main/java/org/apache/pinot/core/realtime/impl/kafka/SimpleAvroMessageDecoder.java
@@ -0,0 +1,84 @@
+/**
+ * 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.pinot.core.realtime.impl.kafka;
+
+import com.google.common.base.Preconditions;
+import java.io.IOException;
+import java.util.Map;
+import javax.annotation.concurrent.NotThreadSafe;
+import org.apache.avro.generic.GenericData;
+import org.apache.avro.generic.GenericDatumReader;
+import org.apache.avro.io.BinaryDecoder;
+import org.apache.avro.io.DatumReader;
+import org.apache.avro.io.DecoderFactory;
+import org.apache.pinot.common.data.Schema;
+import org.apache.pinot.core.data.GenericRow;
+import org.apache.pinot.core.realtime.stream.StreamMessageDecoder;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+
+@NotThreadSafe
+public class SimpleAvroMessageDecoder implements StreamMessageDecoder<byte[]> {
+ private static final Logger LOGGER = LoggerFactory.getLogger(SimpleAvroMessageDecoder.class);
+
+ private static final String SCHEMA = "schema";
+
+ private org.apache.avro.Schema _avroSchema;
+ private DatumReader<GenericData.Record> _datumReader;
+ private AvroRecordToPinotRowGenerator _avroRecordConverter;
+ private BinaryDecoder _binaryDecoderToReuse;
+ private GenericData.Record _avroRecordToReuse;
+
+ @Override
+ public void init(Map<String, String> props, Schema indexingSchema, String topicName)
+ throws Exception {
+ Preconditions.checkState(props.containsKey(SCHEMA), "Avro schema must be provided");
+ _avroSchema = new org.apache.avro.Schema.Parser().parse(props.get(SCHEMA));
+ _datumReader = new GenericDatumReader<>(_avroSchema);
+ _avroRecordConverter = new AvroRecordToPinotRowGenerator(indexingSchema);
+ }
+
+ /**
+ * {@inheritDoc}
+ *
+ * <p>NOTE: the payload should contain message content only (without header).
+ */
+ @Override
+ public GenericRow decode(byte[] payload, GenericRow destination) {
+ return decode(payload, 0, payload.length, destination);
+ }
+
+ /**
+ * {@inheritDoc}
+ *
+ * <p>NOTE: the payload should contain message content only (without header).
+ */
+ @Override
+ public GenericRow decode(byte[] payload, int offset, int length, GenericRow destination) {
+ _binaryDecoderToReuse = DecoderFactory.get().binaryDecoder(payload, offset, length, _binaryDecoderToReuse);
+ try {
+ _avroRecordToReuse = _datumReader.read(_avroRecordToReuse, _binaryDecoderToReuse);
+ } catch (IOException e) {
+ LOGGER.error("Caught exception while reading message using schema: {}", _avroSchema, e);
+ return null;
+ }
+ return _avroRecordConverter.transform(_avroRecordToReuse, destination);
+ }
+}
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