sunchao commented on code in PR #38277: URL: https://github.com/apache/spark/pull/38277#discussion_r1001963440
########## sql/hive/src/main/java/org/apache/hadoop/hive/ql/io/DelegateSymlinkTextInputFormat.java: ########## @@ -0,0 +1,111 @@ +/* + * 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.hadoop.hive.ql.io; + +import java.io.DataInput; +import java.io.DataOutput; +import java.io.IOException; + +import org.apache.hadoop.fs.ContentSummary; +import org.apache.hadoop.fs.Path; +import org.apache.hadoop.io.LongWritable; +import org.apache.hadoop.io.Text; +import org.apache.hadoop.mapred.FileSplit; +import org.apache.hadoop.mapred.InputSplit; +import org.apache.hadoop.mapred.JobConf; +import org.apache.hadoop.mapred.RecordReader; +import org.apache.hadoop.mapred.Reporter; + +/** + * Delegate for SymlinkTextInputFormat, created to address SPARK-40815. + * Fixes an issue where SymlinkTextInputFormat returns empty splits which could result in + * the correctness issue when "spark.hadoopRDD.ignoreEmptySplits" is enabled. + * + * In this class, we update the split start and length to match the target file input thus fixing + * the issue. + */ +@SuppressWarnings("deprecation") +public class DelegateSymlinkTextInputFormat extends SymlinkTextInputFormat { + + public static class DelegateSymlinkTextInputSplit extends FileSplit { + private final SymlinkTextInputSplit split; + + public DelegateSymlinkTextInputSplit() { + super((Path) null, 0, 0, (String[]) null); + split = new SymlinkTextInputSplit(); + } + + public DelegateSymlinkTextInputSplit(Path symlinkPath, SymlinkTextInputSplit split) throws IOException { + // It is fine to set start and length to the target file split because + // SymlinkTextInputFormat maintains 1-1 mapping between SymlinkTextInputSplit and FileSplit. + super(symlinkPath, + split.getTargetSplit().getStart(), + split.getTargetSplit().getLength(), + split.getTargetSplit().getLocations()); + this.split = split; + } + + /** + * Returns delegate input split. + */ + private SymlinkTextInputSplit getSplit() { + return split; + } + + @Override + public void write(DataOutput out) throws IOException { + super.write(out); Review Comment: hmm won't this call `FileSplit.write` twice? ########## sql/hive/src/main/java/org/apache/hadoop/hive/ql/io/DelegateSymlinkTextInputFormat.java: ########## @@ -0,0 +1,111 @@ +/* + * 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.hadoop.hive.ql.io; + +import java.io.DataInput; +import java.io.DataOutput; +import java.io.IOException; + +import org.apache.hadoop.fs.ContentSummary; +import org.apache.hadoop.fs.Path; +import org.apache.hadoop.io.LongWritable; +import org.apache.hadoop.io.Text; +import org.apache.hadoop.mapred.FileSplit; +import org.apache.hadoop.mapred.InputSplit; +import org.apache.hadoop.mapred.JobConf; +import org.apache.hadoop.mapred.RecordReader; +import org.apache.hadoop.mapred.Reporter; + +/** + * Delegate for SymlinkTextInputFormat, created to address SPARK-40815. + * Fixes an issue where SymlinkTextInputFormat returns empty splits which could result in + * the correctness issue when "spark.hadoopRDD.ignoreEmptySplits" is enabled. + * + * In this class, we update the split start and length to match the target file input thus fixing + * the issue. + */ +@SuppressWarnings("deprecation") +public class DelegateSymlinkTextInputFormat extends SymlinkTextInputFormat { + + public static class DelegateSymlinkTextInputSplit extends FileSplit { + private final SymlinkTextInputSplit split; + + public DelegateSymlinkTextInputSplit() { + super((Path) null, 0, 0, (String[]) null); + split = new SymlinkTextInputSplit(); + } + + public DelegateSymlinkTextInputSplit(Path symlinkPath, SymlinkTextInputSplit split) throws IOException { + // It is fine to set start and length to the target file split because + // SymlinkTextInputFormat maintains 1-1 mapping between SymlinkTextInputSplit and FileSplit. + super(symlinkPath, + split.getTargetSplit().getStart(), + split.getTargetSplit().getLength(), + split.getTargetSplit().getLocations()); + this.split = split; + } + + /** + * Returns delegate input split. + */ + private SymlinkTextInputSplit getSplit() { + return split; + } + + @Override + public void write(DataOutput out) throws IOException { + super.write(out); + split.write(out); + } + + @Override + public void readFields(DataInput in) throws IOException { + super.readFields(in); Review Comment: ditto ########## sql/hive/src/main/java/org/apache/hadoop/hive/ql/io/DelegateSymlinkTextInputFormat.java: ########## @@ -0,0 +1,111 @@ +/* + * 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.hadoop.hive.ql.io; + +import java.io.DataInput; +import java.io.DataOutput; +import java.io.IOException; + +import org.apache.hadoop.fs.ContentSummary; +import org.apache.hadoop.fs.Path; +import org.apache.hadoop.io.LongWritable; +import org.apache.hadoop.io.Text; +import org.apache.hadoop.mapred.FileSplit; +import org.apache.hadoop.mapred.InputSplit; +import org.apache.hadoop.mapred.JobConf; +import org.apache.hadoop.mapred.RecordReader; +import org.apache.hadoop.mapred.Reporter; + +/** + * Delegate for SymlinkTextInputFormat, created to address SPARK-40815. + * Fixes an issue where SymlinkTextInputFormat returns empty splits which could result in + * the correctness issue when "spark.hadoopRDD.ignoreEmptySplits" is enabled. + * + * In this class, we update the split start and length to match the target file input thus fixing + * the issue. + */ +@SuppressWarnings("deprecation") +public class DelegateSymlinkTextInputFormat extends SymlinkTextInputFormat { + + public static class DelegateSymlinkTextInputSplit extends FileSplit { + private final SymlinkTextInputSplit split; + + public DelegateSymlinkTextInputSplit() { + super((Path) null, 0, 0, (String[]) null); + split = new SymlinkTextInputSplit(); + } + + public DelegateSymlinkTextInputSplit(Path symlinkPath, SymlinkTextInputSplit split) throws IOException { Review Comment: nit: do we need `symlinkPath`? it can be replaced by `split.getPath()`. ########## sql/hive/src/main/java/org/apache/hadoop/hive/ql/io/DelegateSymlinkTextInputFormat.java: ########## @@ -0,0 +1,111 @@ +/* + * 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.hadoop.hive.ql.io; + +import java.io.DataInput; +import java.io.DataOutput; +import java.io.IOException; + +import org.apache.hadoop.fs.ContentSummary; +import org.apache.hadoop.fs.Path; +import org.apache.hadoop.io.LongWritable; +import org.apache.hadoop.io.Text; +import org.apache.hadoop.mapred.FileSplit; +import org.apache.hadoop.mapred.InputSplit; +import org.apache.hadoop.mapred.JobConf; +import org.apache.hadoop.mapred.RecordReader; +import org.apache.hadoop.mapred.Reporter; + +/** + * Delegate for SymlinkTextInputFormat, created to address SPARK-40815. + * Fixes an issue where SymlinkTextInputFormat returns empty splits which could result in + * the correctness issue when "spark.hadoopRDD.ignoreEmptySplits" is enabled. + * + * In this class, we update the split start and length to match the target file input thus fixing + * the issue. + */ +@SuppressWarnings("deprecation") +public class DelegateSymlinkTextInputFormat extends SymlinkTextInputFormat { + + public static class DelegateSymlinkTextInputSplit extends FileSplit { + private final SymlinkTextInputSplit split; + + public DelegateSymlinkTextInputSplit() { Review Comment: why we need this constructor? -- This is an automated message from the Apache Git Service. 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