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new 37921e09e Rebuild website
37921e09e is described below
commit 37921e09e51af2c853eab6fc833d1b590d2aa4dc
Author: Etienne Chauchot <echauc...@apache.org>
AuthorDate: Wed May 10 11:04:13 2023 +0200
Rebuild website
---
.../index.html | 28 +++++++++++-----------
1 file changed, 14 insertions(+), 14 deletions(-)
diff --git
a/content/2023/05/09/howto-migrate-a-real-life-batch-pipeline-from-the-dataset-api-to-the-datastream-api/index.html
b/content/2023/05/09/howto-migrate-a-real-life-batch-pipeline-from-the-dataset-api-to-the-datastream-api/index.html
index b33895e44..6295d8c01 100644
---
a/content/2023/05/09/howto-migrate-a-real-life-batch-pipeline-from-the-dataset-api-to-the-datastream-api/index.html
+++
b/content/2023/05/09/howto-migrate-a-real-life-batch-pipeline-from-the-dataset-api-to-the-datastream-api/index.html
@@ -986,8 +986,8 @@ operations.</p>
<a class="anchor"
href="#setting-the-execution-environmenthttpsgithubcomechauchottpcds-benchmark-flinkblob4273a3bc45d6e4fbdd5fa531fe48f85b8d0a9d3fsrcmainjavaorgexampletpcdsflinkquery3viaflinkrowdatastreamjaval90-l96">#</a>
</h3>
<p>We start by moving
-from <a
href="https://nightlies.apache.org/flink/flink-docs-release-1.12/api/java/org/apache/flink/api/java/ExecutionEnvironment.html";>ExecutionEnvironment</a>
-to <a
href="https://nightlies.apache.org/flink/flink-docs-release-1.12/api/java/org/apache/flink/streaming/api/environment/StreamExecutionEnvironment.html";>StreamExecutionEnvironment</a>
+from <a
href="https://nightlies.apache.org/flink/flink-docs-release-1.16/api/java/org/apache/flink/api/java/ExecutionEnvironment.html";>ExecutionEnvironment</a>
+to <a
href="https://nightlies.apache.org/flink/flink-docs-release-1.16/api/java/org/apache/flink/streaming/api/environment/StreamExecutionEnvironment.html";>StreamExecutionEnvironment</a>
. Then, as the source in this pipeline is bounded, we can use either the
default
streaming <a
href="https://nightlies.apache.org/flink/flink-docs-release-1.16/docs/dev/datastream/execution_mode//";>execution
mode</a>
or the batch mode. In batch mode the tasks of the job can be separated into
stages that can be
@@ -999,12 +999,12 @@ allow to run the same pipeline with no change on an
unbounded source.</p>
Using the streaming sources and datasets
<a class="anchor" href="#using-the-streaming-sources-and-datasets">#</a>
</h3>
-<p><strong>Sources</strong>: <a
href="https://nightlies.apache.org/flink/flink-docs-release-1.12/api/java/org/apache/flink/api/java/operators/DataSource.html";>DataSource<T></a>
-becomes <a
href="https://nightlies.apache.org/flink/flink-docs-release-1.12/api/java/org/apache/flink/streaming/api/datastream/DataStreamSource.html";>DataStreamSource<T></a>
+<p><strong>Sources</strong>: <a
href="https://nightlies.apache.org/flink/flink-docs-release-1.16/api/java/org/apache/flink/api/java/operators/DataSource.html";>DataSource<T></a>
+becomes <a
href="https://nightlies.apache.org/flink/flink-docs-release-1.16/api/java/org/apache/flink/streaming/api/datastream/DataStreamSource.html";>DataStreamSource<T></a>
after the call to <em>env.createInput()</em>.</p>
-<p><strong>Datasets</strong>: <a
href="https://nightlies.apache.org/flink/flink-docs-release-1.12/api/java/org/apache/flink/api/java/DataSet.html";>DataSet<T></a>
+<p><strong>Datasets</strong>: <a
href="https://nightlies.apache.org/flink/flink-docs-release-1.16/api/java/org/apache/flink/api/java/DataSet.html";>DataSet<T></a>
are
-now <a
href="https://nightlies.apache.org/flink/flink-docs-release-1.12/api/java/org/apache/flink/streaming/api/datastream/DataStream.html";>DataStream<T></a>
+now <a
href="https://nightlies.apache.org/flink/flink-docs-release-1.16/api/java/org/apache/flink/streaming/api/datastream/DataStream.html";>DataStream<T></a>
and subclasses.</p>
<h3
id="migrating-the-join-operationhttpsgithubcomechauchottpcds-benchmark-flinkblob4273a3bc45d6e4fbdd5fa531fe48f85b8d0a9d3fsrcmainjavaorgexampletpcdsflinkquery3viaflinkrowdatastreamjaval129-l135">
<a
href="https://github.com/echauchot/tpcds-benchmark-flink/blob/4273a3bc45d6e4fbdd5fa531fe48f85b8d0a9d3f/src/main/java/org/example/tpcds/flink/Query3ViaFlinkRowDatastream.java#L129-L135";>Migrating
the join operation</a>
@@ -1013,11 +1013,11 @@ and subclasses.</p>
<p>The DataStream join operator does not yet support aggregations in batch
mode (
see <a
href="https://issues.apache.org/jira/browse/FLINK-22587";>FLINK-22587</a> for
details). Basically, the
problem is with the trigger of the
-default <a
href="https://nightlies.apache.org/flink/flink-docs-release-1.12/api/java/org/apache/flink/streaming/api/windowing/windows/GlobalWindow.html";>GlobalWindow</a>
+default <a
href="https://nightlies.apache.org/flink/flink-docs-release-1.16/api/java/org/apache/flink/streaming/api/windowing/windows/GlobalWindow.html";>GlobalWindow</a>
which never fires so the records are never output. We will workaround this
problem by applying a
custom <a
href="https://github.com/echauchot/tpcds-benchmark-flink/blob/9589c7c74e7152badee8400d775b4af7a998e487/src/main/java/org/example/tpcds/flink/Query3ViaFlinkRowDatastream.java#L246-L280";>EndOfStream</a>
window. It is a window assigner that assigns all the records to a
-single <a
href="https://nightlies.apache.org/flink/flink-docs-release-1.12/api/java/org/apache/flink/streaming/api/windowing/windows/TimeWindow.html";>TimeWindow</a>
+single <a
href="https://nightlies.apache.org/flink/flink-docs-release-1.16/api/java/org/apache/flink/streaming/api/windowing/windows/TimeWindow.html";>TimeWindow</a>
. So, like for the GlobalWindow, all the records are assigned to the same
window except that this
window’s trigger is based on the end of the window (which is set to
<em>Long.MAX_VALUE</em>). As we are on
a bounded source, at some point the watermark will advance to +INFINITY
(Long.MAX_VALUE) and will
@@ -1029,11 +1029,11 @@ function.</p>
<a class="anchor"
href="#migrating-the-group-by-and-reduce-sum-operationshttpsgithubcomechauchottpcds-benchmark-flinkblob9589c7c74e7152badee8400d775b4af7a998e487srcmainjavaorgexampletpcdsflinkquery3viaflinkrowdatastreamjaval145-l169">#</a>
</h3>
<p>DataStream API has no
-more <a
href="https://nightlies.apache.org/flink/flink-docs-release-1.12/api/java/org/apache/flink/api/java/DataSet.html#groupBy-org.apache.flink.api.java.functions.KeySelector-";>groupBy()</a>
+more <a
href="https://nightlies.apache.org/flink/flink-docs-release-1.16/api/java/org/apache/flink/api/java/DataSet.html#groupBy-org.apache.flink.api.java.functions.KeySelector-";>groupBy()</a>
method, we now use
-the <a
href="https://nightlies.apache.org/flink/flink-docs-release-1.12/api/java/org/apache/flink/streaming/api/datastream/DataStream.html#keyBy-org.apache.flink.api.java.functions.KeySelector-";>keyBy()</a>
+the <a
href="https://nightlies.apache.org/flink/flink-docs-release-1.16/api/java/org/apache/flink/streaming/api/datastream/DataStream.html#keyBy-org.apache.flink.api.java.functions.KeySelector-";>keyBy()</a>
method. An aggregation downstream will be applied on elements with the same
key exactly as
-a <a
href="https://nightlies.apache.org/flink/flink-docs-release-1.12/api/java/org/apache/flink/api/common/functions/GroupReduceFunction.html";>GroupReduceFunction</a>
+a <a
href="https://nightlies.apache.org/flink/flink-docs-release-1.16/api/java/org/apache/flink/api/common/functions/GroupReduceFunction.html";>GroupReduceFunction</a>
would have done on a DataSet except it will not need to materialize the
collection of data. Indeed, the following
operator is a reducer: the summing operation downstream is still done through
a <a
href="https://nightlies.apache.org/flink/flink-docs-release-1.16/api/java/org/apache/flink/api/common/functions/ReduceFunction.html";>ReduceFunction</a>
@@ -1047,7 +1047,7 @@ Also, please note that, as in the join case, we need to
specify windowing for th
<a class="anchor"
href="#migrating-the-order-by-operationhttpsgithubcomechauchottpcds-benchmark-flinkblob9589c7c74e7152badee8400d775b4af7a998e487srcmainjavaorgexampletpcdsflinkquery3viaflinkrowdatastreamjaval171-l211">#</a>
</h3>
<p>The sort of the datastream is done by applying
-a <a
href="https://nightlies.apache.org/flink/flink-docs-release-1.12/api/java/org/apache/flink/streaming/api/functions/KeyedProcessFunction.html";>KeyedProcessFunction</a>
+a <a
href="https://nightlies.apache.org/flink/flink-docs-release-1.16/api/java/org/apache/flink/streaming/api/functions/KeyedProcessFunction.html";>KeyedProcessFunction</a>
.</p>
<p>But, as said above, the DataStream semantics are the ones of a streaming
pipeline. The arriving data
is thus considered infinite. As such we need to “divide” the data
to have output times. For that we
@@ -1056,7 +1056,7 @@ meaning that the timer will fire at the end of the
batch.</p>
<p>To sort the data, we store the incoming rows inside
a <a
href="https://nightlies.apache.org/flink/flink-docs-release-1.16/api/java/org/apache/flink/api/common/state/ListState.html";>ListState</a>
and sort them at output time, when the timer fires in
-the <a
href="https://nightlies.apache.org/flink/flink-docs-release-1.12/api/java/org/apache/flink/streaming/api/functions/KeyedProcessFunction.html#onTimer-long-org.apache.flink.streaming.api.functions.KeyedProcessFunction.OnTimerContext-org.apache.flink.util.Collector-";>onTimer()</a>
+the <a
href="https://nightlies.apache.org/flink/flink-docs-release-1.16/api/java/org/apache/flink/streaming/api/functions/KeyedProcessFunction.html#onTimer-long-org.apache.flink.streaming.api.functions.KeyedProcessFunction.OnTimerContext-org.apache.flink.util.Collector-";>onTimer()</a>
callback.</p>
<p>Another thing: to be able to use Flink state, we need to key the datastream
beforehand, even if
there
@@ -1081,7 +1081,7 @@ an <a
href="https://nightlies.apache.org/flink/flink-docs-release-1.16/api/java/
. But the resulting code is very similar to the one using the DataSet API.
It’s only
that <a
href="https://nightlies.apache.org/flink/flink-docs-release-1.16/api/java/org/apache/flink/api/common/serialization/Encoder.html#encode-IN-java.io.OutputStream-";>Encoder#encode()</a>
method writes bytes
-when <a
href="https://nightlies.apache.org/flink/flink-docs-release-1.12/api/java/org/apache/flink/api/java/io/TextOutputFormat.TextFormatter.html#format-IN-";>TextOutputFormat.TextFormatter#format()</a>
+when <a
href="https://nightlies.apache.org/flink/flink-docs-release-1.16/api/java/org/apache/flink/api/java/io/TextOutputFormat.TextFormatter.html#format-IN-";>TextOutputFormat.TextFormatter#format()</a>
wrote Strings.</p>
<h2 id="conclusion">
Conclusion
