Github user satishd commented on a diff in the pull request:
https://github.com/apache/storm/pull/827#discussion_r45045556
--- Diff:
external/storm-cassandra/src/main/java/org/apache/storm/cassandra/bolt/BatchCassandraWriterBolt.java
---
@@ -0,0 +1,192 @@
+/**
+ * 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.storm.cassandra.bolt;
+
+import backtype.storm.Config;
+import backtype.storm.task.OutputCollector;
+import backtype.storm.task.TopologyContext;
+import backtype.storm.tuple.Tuple;
+import backtype.storm.utils.Time;
+import com.datastax.driver.core.Statement;
+import org.apache.storm.cassandra.executor.AsyncResultHandler;
+import org.apache.storm.cassandra.executor.impl.BatchAsyncResultHandler;
+import org.apache.storm.cassandra.query.CQLStatementTupleMapper;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
+import java.util.concurrent.LinkedBlockingQueue;
+import java.util.concurrent.TimeUnit;
+
+public class BatchCassandraWriterBolt extends
BaseCassandraBolt<List<Tuple>> {
+
+ private final static Logger LOG =
LoggerFactory.getLogger(BatchCassandraWriterBolt.class);
+
+ public static final int DEFAULT_EMIT_FREQUENCY = 2;
+
+ private static final int QUEUE_MAX_SIZE = 1000;
+
+ private LinkedBlockingQueue<Tuple> queue;
+
+ private int tickFrequencyInSeconds;
+
+ private long lastModifiedTimesMillis;
+
+ private String componentID;
+
+ private AsyncResultHandler<List<Tuple>> asyncResultHandler;
+
+ /**
+ * Creates a new {@link CassandraWriterBolt} instance.
+ *
+ * @param tupleMapper
+ */
+ public BatchCassandraWriterBolt(CQLStatementTupleMapper tupleMapper) {
+ this(tupleMapper, DEFAULT_EMIT_FREQUENCY);
+ }
+
+ /**
+ * Creates a new {@link CassandraWriterBolt} instance.
+ *
+ * @param tupleMapper
+ */
+ public BatchCassandraWriterBolt(CQLStatementTupleMapper tupleMapper,
int tickFrequencyInSeconds) {
+ super(tupleMapper);
+ this.tickFrequencyInSeconds = tickFrequencyInSeconds;
+ }
+ /**
+ * {@inheritDoc}
+ */
+ @Override
+ public void prepare(Map stormConfig, TopologyContext topologyContext,
OutputCollector outputCollector) {
+ super.prepare(stormConfig, topologyContext, outputCollector);
+ this.componentID = topologyContext.getThisComponentId();
+ this.queue = new LinkedBlockingQueue<>(QUEUE_MAX_SIZE);
--- End diff --
queue size should be configurable at bolt like withQueueSize or
withBatchSize.
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