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https://issues.apache.org/jira/browse/GOBBLIN-672?focusedWorklogId=230955&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-230955
]
ASF GitHub Bot logged work on GOBBLIN-672:
------------------------------------------
Author: ASF GitHub Bot
Created on: 22/Apr/19 23:22
Start Date: 22/Apr/19 23:22
Worklog Time Spent: 10m
Work Description: yukuai518 commented on pull request #2542:
[GOBBLIN-672] add EventHub source
URL: https://github.com/apache/incubator-gobblin/pull/2542#discussion_r277471042
##########
File path:
gobblin-modules/gobblin-eventhub/src/main/java/org/apache/gobblin/eventhub/source/EventhubSource.java
##########
@@ -0,0 +1,152 @@
+/*
+ * 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.gobblin.eventhub.source;
+
+import com.google.common.base.Preconditions;
+import com.google.common.collect.Lists;
+import com.google.gson.Gson;
+import com.microsoft.azure.eventhubs.EventData;
+import org.apache.gobblin.configuration.ConfigurationKeys;
+import org.apache.gobblin.configuration.SourceState;
+import org.apache.gobblin.configuration.WorkUnitState;
+import org.apache.gobblin.source.extractor.extract.AbstractSource;
+import org.apache.gobblin.source.extractor.extract.LongWatermark;
+import org.apache.gobblin.source.extractor.partition.Partition;
+import org.apache.gobblin.source.extractor.partition.Partitioner;
+import org.apache.gobblin.source.workunit.Extract;
+import org.apache.gobblin.source.workunit.MultiWorkUnit;
+import org.apache.gobblin.source.workunit.WorkUnit;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.IOException;
+import java.util.*;
+
+
+/**
+ * Created by Jan on 23-Jan-19.
+ */
+public class EventhubSource extends AbstractSource<Void, EventData> {
+
+ public static final Logger LOG =
LoggerFactory.getLogger(EventhubSource.class);
+
+ public static final String WORK_UNIT_STATE_VERSION_KEY =
"source.querybased.workUnitState.version";
+ public static final Integer CURRENT_WORK_UNIT_STATE_VERSION = 1;
+
+ @Override
+ public List<WorkUnit> getWorkunits(SourceState state) {
+ List<WorkUnit> workUnits = new ArrayList<>();
+
+ Long previousWatermark = getPreviousWatermark(state);
+ if (previousWatermark == null) {
+ previousWatermark = ConfigurationKeys.DEFAULT_WATERMARK_VALUE;
+ }
+
+ // for now, enforce single work unit to simplify watermark handling:
+ if
(state.getPropAsInt(ConfigurationKeys.SOURCE_MAX_NUMBER_OF_PARTITIONS, 1) != 1)
{
+ LOG.error("Unsupported number of partitions, resetting to 1.");
+ }
+ state.setProp(ConfigurationKeys.SOURCE_MAX_NUMBER_OF_PARTITIONS, 1);
+ workUnits.addAll(generateWorkUnits(state, previousWatermark));
+
+ LOG.info("Total number of workunits for the current run: " +
workUnits.size());
+ List<WorkUnit> previousWorkUnits =
this.getPreviousWorkUnitsForRetry(state);
+ LOG.info("Total number of incomplete tasks from the previous run: " +
previousWorkUnits.size());
+ workUnits.addAll(previousWorkUnits);
+
+ int numOfMultiWorkunits =
+ state.getPropAsInt(ConfigurationKeys.MR_JOB_MAX_MAPPERS_KEY,
ConfigurationKeys.DEFAULT_MR_JOB_MAX_MAPPERS);
+
+ return pack(workUnits, numOfMultiWorkunits);
+ }
+
+ private static List<WorkUnit> pack(List<WorkUnit> workUnits, int
numOfMultiWorkunits) {
+ Preconditions.checkArgument(numOfMultiWorkunits > 0);
+
+ if (workUnits.size() <= numOfMultiWorkunits) {
+ return workUnits;
+ }
+ List<WorkUnit> result =
Lists.newArrayListWithCapacity(numOfMultiWorkunits);
+ for (int i = 0; i < numOfMultiWorkunits; i++) {
+ result.add(MultiWorkUnit.createEmpty());
+ }
+ for (int i = 0; i < workUnits.size(); i++) {
+ ((MultiWorkUnit) result.get(i %
numOfMultiWorkunits)).addWorkUnit(workUnits.get(i));
+ }
+ return result;
+ }
+
+ protected List<WorkUnit> generateWorkUnits(SourceState state, long
previousWatermark) {
+ List<WorkUnit> workUnits = new ArrayList<>();
+
+ state.setProp(ConfigurationKeys.EXTRACT_DELTA_FIELDS_KEY, "offset");
+ state.setProp(ConfigurationKeys.SOURCE_QUERYBASED_WATERMARK_TYPE,
"simple");
+ state.setProp(ConfigurationKeys.SOURCE_QUERYBASED_EXTRACT_TYPE,
"snapshot");
+ List<Partition> partitions = new
Partitioner(state).getPartitionList(previousWatermark);
Review comment:
Like I mentioned, there shouldn't be a global previous watermark. Right now
if you have one partition, it will cut one partition range into multiple
pieces, which doesn't have any ordering guarantees. This is not what we want.
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Issue Time Tracking
-------------------
Worklog Id: (was: 230955)
Time Spent: 2h 10m (was: 2h)
> Add EventHub source
> -------------------
>
> Key: GOBBLIN-672
> URL: https://issues.apache.org/jira/browse/GOBBLIN-672
> Project: Apache Gobblin
> Issue Type: New Feature
> Reporter: Jan Fabian
> Priority: Minor
> Time Spent: 2h 10m
> Remaining Estimate: 0h
>
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