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https://issues.apache.org/jira/browse/BEAM-4432?focusedWorklogId=115950&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-115950
]
ASF GitHub Bot logged work on BEAM-4432:
----------------------------------------
Author: ASF GitHub Bot
Created on: 26/Jun/18 12:38
Start Date: 26/Jun/18 12:38
Worklog Time Spent: 10m
Work Description: iemejia commented on a change in pull request #5519:
[BEAM-4432] Adding Sources to produce Synthetic output for Batch pipelines
URL: https://github.com/apache/beam/pull/5519#discussion_r198074385
##########
File path:
sdks/java/io/common/src/main/java/org/apache/beam/sdk/io/common/synthetic/SyntheticBoundedInput.java
##########
@@ -0,0 +1,452 @@
+/*
+ * 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.beam.sdk.io.common.synthetic;
+
+import static com.google.common.base.Preconditions.checkArgument;
+import static com.google.common.base.Preconditions.checkNotNull;
+import static org.apache.commons.math3.stat.StatUtils.sum;
+
+import com.fasterxml.jackson.annotation.JsonProperty;
+import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
+import com.google.common.base.MoreObjects;
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+import java.util.NoSuchElementException;
+import java.util.Random;
+import org.apache.beam.sdk.coders.ByteArrayCoder;
+import org.apache.beam.sdk.coders.Coder;
+import org.apache.beam.sdk.coders.KvCoder;
+import org.apache.beam.sdk.io.OffsetBasedSource;
+import org.apache.beam.sdk.io.Read;
+import org.apache.beam.sdk.options.PipelineOptions;
+import org.apache.beam.sdk.values.KV;
+import org.apache.beam.sdk.values.PCollection;
+import org.apache.commons.math3.distribution.ConstantRealDistribution;
+import org.joda.time.Duration;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * This {@link SyntheticBoundedInput} class provides a parameterizable batch
custom source that is
+ * deterministic.
+ *
+ * <p>The {@link SyntheticBoundedSource} generates a {@link PCollection} of
+ * {@code KV<byte[], byte[]>}. A fraction of the generated records {@code
KV<byte[], byte[]>} are
+ * associated with "hot" keys, which are uniformly distributed over a fixed
number of hot keys.
+ * The remaining generated records are associated with "random" keys.
+ * Each record will be slowed down by a certain sleep time generated based on
the specified sleep
+ * time distribution when the {@link SyntheticSourceReader} reads each record.
+ * The record {@code KV<byte[], byte[]>} is generated deterministically based
on the record's
+ * position in the source, which enables repeatable execution for debugging.
+ * The SyntheticBoundedInput configurable parameters are defined in {@link
+ * SyntheticBoundedInput.SourceOptions}.
+ *
+ * <p>To read a {@link PCollection} of {@code KV<byte[], byte[]>} from {@link
+ * SyntheticBoundedInput}, use {@link SyntheticBoundedInput#readFrom} to
construct the synthetic
+ * source with synthetic source options.
+ * See {@link SyntheticBoundedInput.SourceOptions} for how to construct an
instance.
+ * An example is below:
+ * <pre> {@code
+ * Pipeline p = ...;
+ * SyntheticBoundedInput.SourceOptions sso = ...;
+ *
+ * // Construct the synthetic input with synthetic source options.
+ * PCollection<KV<byte[], byte[]>> input =
p.apply(SyntheticBoundedInput.readFrom(sso));
Review comment:
Please add a test for `SyntheticBoundedInput` use. Also validate in the
tests the full set of options on `SourceOptions`. I found a validation issue
with the HashFunction non being available because it is transient so it
probably gets lost on deserialization.
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Issue Time Tracking
-------------------
Worklog Id: (was: 115950)
Time Spent: 4h 10m (was: 4h)
> Performance tests need a way to generate Synthetic data
> -------------------------------------------------------
>
> Key: BEAM-4432
> URL: https://issues.apache.org/jira/browse/BEAM-4432
> Project: Beam
> Issue Type: Improvement
> Components: testing
> Reporter: Pablo Estrada
> Assignee: Pablo Estrada
> Priority: Minor
> Time Spent: 4h 10m
> Remaining Estimate: 0h
>
> GenerateSequence fal.lls short in this regard, as we may want to generate
> data in custom distributions, or with specific repeatability requirements /
> and hardcoded delays for autoscaling.
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