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https://issues.apache.org/jira/browse/PARQUET-1866?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17113905#comment-17113905
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ASF GitHub Bot commented on PARQUET-1866:
-----------------------------------------
gszadovszky commented on a change in pull request #793:
URL: https://github.com/apache/parquet-mr/pull/793#discussion_r429112028
##########
File path:
parquet-hadoop/src/main/java/org/apache/parquet/hadoop/codec/ZstdCodec.java
##########
@@ -0,0 +1,112 @@
+/*
+ * 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.parquet.hadoop.codec;
+
+import org.apache.hadoop.conf.Configurable;
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.io.compress.CompressionCodec;
+import org.apache.hadoop.io.compress.CompressionInputStream;
+import org.apache.hadoop.io.compress.CompressionOutputStream;
+import org.apache.hadoop.io.compress.Compressor;
+import org.apache.hadoop.io.compress.Decompressor;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+
+/**
+ * ZSTD compression codec for Parquet. We do not use the default hadoop
+ * one because it requires 1) to set up hadoop on local develop machine;
Review comment:
```suggestion
* one because it requires 1) to set up hadoop on local development machine;
```
##########
File path:
parquet-hadoop/src/test/java/org/apache/parquet/hadoop/TestZstdCodec.java
##########
@@ -0,0 +1,74 @@
+/*
+ * 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.parquet.hadoop;
+
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.io.compress.CompressionOutputStream;
+import org.apache.parquet.bytes.BytesInput;
+import org.apache.parquet.hadoop.codec.ZstdCodec;
+import org.junit.Assert;
+import org.junit.Test;
+
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.Random;
+
+public class TestZstdCodec {
Review comment:
I tried to find the code part where we set the hadoop conf to the codec
but could not find it. Please, write a high level test where you set
compression level and workers in the hadoop conf and executes a file write via
e.g. an MR job.
##########
File path:
parquet-hadoop/src/main/java/org/apache/parquet/hadoop/codec/ZstdCodec.java
##########
@@ -0,0 +1,112 @@
+/*
+ * 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.parquet.hadoop.codec;
+
+import org.apache.hadoop.conf.Configurable;
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.io.compress.CompressionCodec;
+import org.apache.hadoop.io.compress.CompressionInputStream;
+import org.apache.hadoop.io.compress.CompressionOutputStream;
+import org.apache.hadoop.io.compress.Compressor;
+import org.apache.hadoop.io.compress.Decompressor;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+
+/**
+ * ZSTD compression codec for Parquet. We do not use the default hadoop
+ * one because it requires 1) to set up hadoop on local develop machine;
+ * 2) to upgrade hadoop to the newer version to have ZSTD support which is
+ * more cumbersome than upgrading parquet version.
+ *
+ * This implementation relies on ZSTD JNI(https://github.com/luben/zstd-jni)
+ * which is already a dependency for Parquet. ZSTD JNI ZstdOutputStream and
+ * ZstdInputStream use Zstd internally. So no need to create compressor and
+ * decompressor in ZstdCodec.
+ */
+public class ZstdCodec implements Configurable, CompressionCodec {
+
+ public final static String PARQUET_COMPRESS_ZSTD_LEVEL =
"parquet.compression.codec.zstd.level";
+ public final static int DEFAULT_PARQUET_COMPRESS_ZSTD_LEVEL = 3;
+ public final static String PARQUET_COMPRESS_ZSTD_WORKERS =
"parquet.compression.codec.zstd.workers";
+ public final static int DEFAULTPARQUET_COMPRESS_ZSTD_WORKERS = 0;
Review comment:
Please, also update the documentation in the
[README](https://github.com/apache/parquet-mr/blob/master/parquet-hadoop/README.md).
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> Replace Hadoop ZSTD with JNI-ZSTD
> ---------------------------------
>
> Key: PARQUET-1866
> URL: https://issues.apache.org/jira/browse/PARQUET-1866
> Project: Parquet
> Issue Type: Improvement
> Components: parquet-mr
> Affects Versions: 1.12.0
> Reporter: Xinli Shang
> Assignee: Xinli Shang
> Priority: Major
> Fix For: 1.12.0
>
>
> The parquet-mr repo has been using
> [ZSTD-JNI|https://github.com/luben/zstd-jni/tree/master/src/main/java/com/github/luben/zstd]
> for the parquet-cli project. It is a cleaner approach to use this JNI than
> using Hadoop ZSTD compression, because 1) on the developing box, installing
> Hadoop is cumbersome, 2) Older version of Hadoop doesn't support ZSTD.
> Upgrading Hadoop is another pain. This Jira is to replace Hadoop ZSTD with
> ZSTD-JNI for parquet-hadoop project.
> According to the author of ZSTD-JNI, Flink, Spark, Cassandra all use ZSTD-JNI
> for ZSTD.
> Another approach is to use https://github.com/airlift/aircompressor which is
> a pure Java implementation. But it seems the compression level is not
> adjustable in aircompressor.
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