[GitHub] [incubator-hudi] vinothchandar commented on a change in pull request #1159: [HUDI-479] Eliminate or Minimize use of Guava if possible

2020-03-27 Thread GitBox
vinothchandar commented on a change in pull request #1159: [HUDI-479] Eliminate 
or Minimize use of Guava if possible
URL: https://github.com/apache/incubator-hudi/pull/1159#discussion_r399312059
 
 

 ##
 File path: 
hudi-common/src/main/java/org/apache/hudi/common/util/FileIOUtils.java
 ##
 @@ -91,4 +94,29 @@ public static void writeStringToFile(String str, String 
filePath) throws IOExcep
 out.flush();
 out.close();
   }
+
+  /**
+   * Closes a {@link Closeable}, with control over whether an {@code 
IOException} may be thrown.
+   * @param closeable the {@code Closeable} object to be closed, or null,
+   *  in which case this method does nothing.
+   * @param swallowIOException if true, don't propagate IO exceptions thrown 
by the {@code close} methods.
+   *
+   * @throws IOException if {@code swallowIOException} is false and {@code 
close} throws an {@code IOException}.
+   */
+  public static void close(@Nullable Closeable closeable, boolean 
swallowIOException)
+  throws IOException {
+if (closeable == null) {
+  return;
+}
+try {
+  closeable.close();
+} catch (IOException e) {
+  if (!swallowIOException) {
+throw e;
+  }
+}
+  }
+
+  /** Maximum loop count when creating temp directories. */
+  private static final int TEMP_DIR_ATTEMPTS = 1;
 
 Review comment:
   we don't need this anymore correct?


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[GitHub] [incubator-hudi] vinothchandar commented on a change in pull request #1159: [HUDI-479] Eliminate or Minimize use of Guava if possible

2020-03-26 Thread GitBox
vinothchandar commented on a change in pull request #1159: [HUDI-479] Eliminate 
or Minimize use of Guava if possible
URL: https://github.com/apache/incubator-hudi/pull/1159#discussion_r398713100
 
 

 ##
 File path: 
hudi-common/src/main/java/org/apache/hudi/common/util/CollectionUtils.java
 ##
 @@ -0,0 +1,132 @@
+/*
+ * 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.hudi.common.util;
+
+import java.util.Collections;
+import java.util.Iterator;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Objects;
+import java.util.Set;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+
+public class CollectionUtils {
+  /**
+   * Determines whether two iterators contain equal elements in the same 
order. More specifically,
+   * this method returns {@code true} if {@code iterator1} and {@code 
iterator2} contain the same
+   * number of elements and every element of {@code iterator1} is equal to the 
corresponding element
+   * of {@code iterator2}.
+   *
+   * Note that this will modify the supplied iterators, since they will 
have been advanced some
+   * number of elements forward.
+   */
+  public static boolean elementsEqual(Iterator iterator1, Iterator 
iterator2) {
+while (iterator1.hasNext()) {
+  if (!iterator2.hasNext()) {
+return false;
+  }
+  Object o1 = iterator1.next();
+  Object o2 = iterator2.next();
+  if (!Objects.equals(o1, o2)) {
+return false;
+  }
+}
+return !iterator2.hasNext();
+  }
+
+  @SafeVarargs
+  public static  Set createSetFromElements(final T... elements) {
+return Stream.of(elements).collect(Collectors.toSet());
+  }
+
+  public static  Map createImmutableMap(final K key, final V value) 
{
+return Collections.unmodifiableMap(Collections.singletonMap(key, value));
+  }
+
+  @SafeVarargs
+  public static  List createImmutableList(final T... elements) {
+return 
Collections.unmodifiableList(Stream.of(elements).collect(Collectors.toList()));
+  }
+
+  public static  Map createImmutableMap(final Map map) {
+return Collections.unmodifiableMap(map);
+  }
+
+  @SafeVarargs
+  public static  Set createImmutableSet(final T... elements) {
+return 
Collections.unmodifiableSet(Stream.of(elements).collect(Collectors.toSet()));
+  }
+
+  public static  Set createImmutableSet(final Set set) {
+return Collections.unmodifiableSet(set);
+  }
+
+  public static  List createImmutableList(final List list) {
+return Collections.unmodifiableList(list);
+  }
+
+  private static Object[] checkElementsNotNull(Object... array) {
+return checkElementsNotNull(array, array.length);
+  }
+
+  private static Object[] checkElementsNotNull(Object[] array, int length) {
+for (int i = 0; i < length; i++) {
+  checkElementNotNull(array[i], i);
+}
+return array;
+  }
+
+  private static Object checkElementNotNull(Object element, int index) {
+if (element == null) {
+  throw new NullPointerException("at index " + index);
+}
+return element;
+  }
+
+  public static class Maps {
 
 Review comment:
   https://issues.apache.org/jira/browse/HUDI-737 filed this 


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[GitHub] [incubator-hudi] vinothchandar commented on a change in pull request #1159: [HUDI-479] Eliminate or Minimize use of Guava if possible

2020-03-25 Thread GitBox
vinothchandar commented on a change in pull request #1159: [HUDI-479] Eliminate 
or Minimize use of Guava if possible
URL: https://github.com/apache/incubator-hudi/pull/1159#discussion_r39816
 
 

 ##
 File path: 
hudi-common/src/main/java/org/apache/hudi/common/util/CollectionUtils.java
 ##
 @@ -0,0 +1,132 @@
+/*
+ * 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.hudi.common.util;
+
+import java.util.Collections;
+import java.util.Iterator;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Objects;
+import java.util.Set;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+
+public class CollectionUtils {
+  /**
+   * Determines whether two iterators contain equal elements in the same 
order. More specifically,
+   * this method returns {@code true} if {@code iterator1} and {@code 
iterator2} contain the same
+   * number of elements and every element of {@code iterator1} is equal to the 
corresponding element
+   * of {@code iterator2}.
+   *
+   * Note that this will modify the supplied iterators, since they will 
have been advanced some
+   * number of elements forward.
+   */
+  public static boolean elementsEqual(Iterator iterator1, Iterator 
iterator2) {
+while (iterator1.hasNext()) {
+  if (!iterator2.hasNext()) {
+return false;
+  }
+  Object o1 = iterator1.next();
+  Object o2 = iterator2.next();
+  if (!Objects.equals(o1, o2)) {
+return false;
+  }
+}
+return !iterator2.hasNext();
+  }
+
+  @SafeVarargs
+  public static  Set createSetFromElements(final T... elements) {
+return Stream.of(elements).collect(Collectors.toSet());
+  }
+
+  public static  Map createImmutableMap(final K key, final V value) 
{
+return Collections.unmodifiableMap(Collections.singletonMap(key, value));
+  }
+
+  @SafeVarargs
+  public static  List createImmutableList(final T... elements) {
+return 
Collections.unmodifiableList(Stream.of(elements).collect(Collectors.toList()));
+  }
+
+  public static  Map createImmutableMap(final Map map) {
+return Collections.unmodifiableMap(map);
+  }
+
+  @SafeVarargs
+  public static  Set createImmutableSet(final T... elements) {
+return 
Collections.unmodifiableSet(Stream.of(elements).collect(Collectors.toSet()));
+  }
+
+  public static  Set createImmutableSet(final Set set) {
+return Collections.unmodifiableSet(set);
+  }
+
+  public static  List createImmutableList(final List list) {
+return Collections.unmodifiableList(list);
+  }
+
+  private static Object[] checkElementsNotNull(Object... array) {
+return checkElementsNotNull(array, array.length);
+  }
+
+  private static Object[] checkElementsNotNull(Object[] array, int length) {
+for (int i = 0; i < length; i++) {
+  checkElementNotNull(array[i], i);
+}
+return array;
+  }
+
+  private static Object checkElementNotNull(Object element, int index) {
+if (element == null) {
+  throw new NullPointerException("at index " + index);
+}
+return element;
+  }
+
+  public static class Maps {
 
 Review comment:
   we can file a follow up JIRA and deal with it later it as well


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[GitHub] [incubator-hudi] vinothchandar commented on a change in pull request #1159: [HUDI-479] Eliminate or Minimize use of Guava if possible

2020-03-25 Thread GitBox
vinothchandar commented on a change in pull request #1159: [HUDI-479] Eliminate 
or Minimize use of Guava if possible
URL: https://github.com/apache/incubator-hudi/pull/1159#discussion_r398323808
 
 

 ##
 File path: 
hudi-common/src/main/java/org/apache/hudi/common/util/FileIOUtils.java
 ##
 @@ -91,4 +94,55 @@ public static void writeStringToFile(String str, String 
filePath) throws IOExcep
 out.flush();
 out.close();
   }
+
+  /**
+   * Closes a {@link Closeable}, with control over whether an {@code 
IOException} may be thrown.
+   * @param closeable the {@code Closeable} object to be closed, or null,
+   *  in which case this method does nothing.
+   * @param swallowIOException if true, don't propagate IO exceptions thrown 
by the {@code close} methods.
+   *
+   * @throws IOException if {@code swallowIOException} is false and {@code 
close} throws an {@code IOException}.
+   */
+  public static void close(@Nullable Closeable closeable, boolean 
swallowIOException)
+  throws IOException {
+if (closeable == null) {
+  return;
+}
+try {
+  closeable.close();
+} catch (IOException e) {
+  if (!swallowIOException) {
+throw e;
+  }
+}
+  }
+
+  /** Maximum loop count when creating temp directories. */
+  private static final int TEMP_DIR_ATTEMPTS = 1;
+
+  /**
+   * Create a Temporary Directory.
+   * @return {@code File}
+   */
+  public static File createTempDir() {
 
 Review comment:
   this is mostly used by tests, right?  I think we should just replace those 
with Junit temporary folder or use `Files.createTempDirectory()` from jdk here 
instead of creating it by hand.. This code and the retry loops can be 
simplified to 1 line, java will set up hooks to delete the directories on exit 
etc, if we do that.. 


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[GitHub] [incubator-hudi] vinothchandar commented on a change in pull request #1159: [HUDI-479] Eliminate or Minimize use of Guava if possible

2020-03-25 Thread GitBox
vinothchandar commented on a change in pull request #1159: [HUDI-479] Eliminate 
or Minimize use of Guava if possible
URL: https://github.com/apache/incubator-hudi/pull/1159#discussion_r398318223
 
 

 ##
 File path: 
hudi-cli/src/test/java/org/apache/hudi/cli/common/HoodieTestCommitMetadataGenerator.java
 ##
 @@ -95,10 +96,9 @@ public static HoodieCommitMetadata 
generateCommitMetadata(String basePath) throw
 HoodieTestUtils.createNewDataFile(basePath, 
DEFAULT_FIRST_PARTITION_PATH, "000");
 String file1P1C0 =
 HoodieTestUtils.createNewDataFile(basePath, 
DEFAULT_SECOND_PARTITION_PATH, "000");
-return generateCommitMetadata(new ImmutableMap.Builder()
-  .put(DEFAULT_FIRST_PARTITION_PATH, new 
ImmutableList.Builder<>().add(file1P0C0).build())
-  .put(DEFAULT_SECOND_PARTITION_PATH, new 
ImmutableList.Builder<>().add(file1P1C0).build())
-  .build());
+return generateCommitMetadata(new Maps.MapBuilder>()
 
 Review comment:
   this can just be replaced with a in-place Map construction syntax 
   
   ```
   Map doubleBraceMap  = new HashMap() {{
   put("key1", "value1");
   put("key2", "value2");
   }};
   ```


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[GitHub] [incubator-hudi] vinothchandar commented on a change in pull request #1159: [HUDI-479] Eliminate or Minimize use of Guava if possible

2020-03-25 Thread GitBox
vinothchandar commented on a change in pull request #1159: [HUDI-479] Eliminate 
or Minimize use of Guava if possible
URL: https://github.com/apache/incubator-hudi/pull/1159#discussion_r398320467
 
 

 ##
 File path: 
hudi-common/src/main/java/org/apache/hudi/common/util/CleanerUtils.java
 ##
 @@ -28,19 +28,19 @@
 import org.apache.hudi.common.versioning.clean.CleanV1MigrationHandler;
 import org.apache.hudi.common.versioning.clean.CleanV2MigrationHandler;
 
-import com.google.common.collect.ImmutableMap;
-
 import java.io.IOException;
 import java.util.List;
 
+import static org.apache.hudi.common.util.CollectionUtils.Maps;
+
 public class CleanerUtils {
   public static final Integer CLEAN_METADATA_VERSION_1 = 
CleanV1MigrationHandler.VERSION;
   public static final Integer CLEAN_METADATA_VERSION_2 = 
CleanV2MigrationHandler.VERSION;
   public static final Integer LATEST_CLEAN_METADATA_VERSION = 
CLEAN_METADATA_VERSION_2;
 
   public static HoodieCleanMetadata convertCleanMetadata(HoodieTableMetaClient 
metaClient,
   String startCleanTime, Option durationInMs, List 
cleanStats) {
-ImmutableMap.Builder 
partitionMetadataBuilder = ImmutableMap.builder();
+Maps.MapBuilder 
partitionMetadataBuilder = new Maps.MapBuilder<>();
 
 Review comment:
   this probably can be just replaced by a concrete map impl in place right? 
this sort of usage does not really warrant the builder pattern IMO. 


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[GitHub] [incubator-hudi] vinothchandar commented on a change in pull request #1159: [HUDI-479] Eliminate or Minimize use of Guava if possible

2020-03-25 Thread GitBox
vinothchandar commented on a change in pull request #1159: [HUDI-479] Eliminate 
or Minimize use of Guava if possible
URL: https://github.com/apache/incubator-hudi/pull/1159#discussion_r398321039
 
 

 ##
 File path: 
hudi-common/src/main/java/org/apache/hudi/common/util/CollectionUtils.java
 ##
 @@ -0,0 +1,132 @@
+/*
+ * 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.hudi.common.util;
+
+import java.util.Collections;
+import java.util.Iterator;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Objects;
+import java.util.Set;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+
+public class CollectionUtils {
+  /**
+   * Determines whether two iterators contain equal elements in the same 
order. More specifically,
+   * this method returns {@code true} if {@code iterator1} and {@code 
iterator2} contain the same
+   * number of elements and every element of {@code iterator1} is equal to the 
corresponding element
+   * of {@code iterator2}.
+   *
+   * Note that this will modify the supplied iterators, since they will 
have been advanced some
+   * number of elements forward.
+   */
+  public static boolean elementsEqual(Iterator iterator1, Iterator 
iterator2) {
+while (iterator1.hasNext()) {
+  if (!iterator2.hasNext()) {
+return false;
+  }
+  Object o1 = iterator1.next();
+  Object o2 = iterator2.next();
+  if (!Objects.equals(o1, o2)) {
+return false;
+  }
+}
+return !iterator2.hasNext();
+  }
+
+  @SafeVarargs
+  public static  Set createSetFromElements(final T... elements) {
 
 Review comment:
   rename to just `createSet`? 


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[GitHub] [incubator-hudi] vinothchandar commented on a change in pull request #1159: [HUDI-479] Eliminate or Minimize use of Guava if possible

2020-03-25 Thread GitBox
vinothchandar commented on a change in pull request #1159: [HUDI-479] Eliminate 
or Minimize use of Guava if possible
URL: https://github.com/apache/incubator-hudi/pull/1159#discussion_r398321209
 
 

 ##
 File path: 
hudi-common/src/main/java/org/apache/hudi/common/util/CollectionUtils.java
 ##
 @@ -0,0 +1,132 @@
+/*
+ * 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.hudi.common.util;
+
+import java.util.Collections;
+import java.util.Iterator;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Objects;
+import java.util.Set;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+
+public class CollectionUtils {
+  /**
+   * Determines whether two iterators contain equal elements in the same 
order. More specifically,
+   * this method returns {@code true} if {@code iterator1} and {@code 
iterator2} contain the same
+   * number of elements and every element of {@code iterator1} is equal to the 
corresponding element
+   * of {@code iterator2}.
+   *
+   * Note that this will modify the supplied iterators, since they will 
have been advanced some
+   * number of elements forward.
+   */
+  public static boolean elementsEqual(Iterator iterator1, Iterator 
iterator2) {
+while (iterator1.hasNext()) {
+  if (!iterator2.hasNext()) {
+return false;
+  }
+  Object o1 = iterator1.next();
+  Object o2 = iterator2.next();
+  if (!Objects.equals(o1, o2)) {
+return false;
+  }
+}
+return !iterator2.hasNext();
+  }
+
+  @SafeVarargs
+  public static  Set createSetFromElements(final T... elements) {
+return Stream.of(elements).collect(Collectors.toSet());
+  }
+
+  public static  Map createImmutableMap(final K key, final V value) 
{
+return Collections.unmodifiableMap(Collections.singletonMap(key, value));
+  }
+
+  @SafeVarargs
+  public static  List createImmutableList(final T... elements) {
+return 
Collections.unmodifiableList(Stream.of(elements).collect(Collectors.toList()));
+  }
+
+  public static  Map createImmutableMap(final Map map) {
+return Collections.unmodifiableMap(map);
+  }
+
+  @SafeVarargs
+  public static  Set createImmutableSet(final T... elements) {
+return 
Collections.unmodifiableSet(Stream.of(elements).collect(Collectors.toSet()));
 
 Review comment:
   reuse and call createSet() from above?


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[GitHub] [incubator-hudi] vinothchandar commented on a change in pull request #1159: [HUDI-479] Eliminate or Minimize use of Guava if possible

2020-03-25 Thread GitBox
vinothchandar commented on a change in pull request #1159: [HUDI-479] Eliminate 
or Minimize use of Guava if possible
URL: https://github.com/apache/incubator-hudi/pull/1159#discussion_r398323238
 
 

 ##
 File path: 
hudi-common/src/main/java/org/apache/hudi/common/util/FileIOUtils.java
 ##
 @@ -91,4 +94,55 @@ public static void writeStringToFile(String str, String 
filePath) throws IOExcep
 out.flush();
 out.close();
   }
+
+  /**
+   * Closes a {@link Closeable}, with control over whether an {@code 
IOException} may be thrown.
+   * @param closeable the {@code Closeable} object to be closed, or null,
+   *  in which case this method does nothing.
+   * @param swallowIOException if true, don't propagate IO exceptions thrown 
by the {@code close} methods.
+   *
+   * @throws IOException if {@code swallowIOException} is false and {@code 
close} throws an {@code IOException}.
+   */
+  public static void close(@Nullable Closeable closeable, boolean 
swallowIOException)
+  throws IOException {
+if (closeable == null) {
+  return;
+}
+try {
+  closeable.close();
 
 Review comment:
   just the following in the try block? 
   
   ```
   if (closeable != null) {
 closeable.close();
   }
   ```


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[GitHub] [incubator-hudi] vinothchandar commented on a change in pull request #1159: [HUDI-479] Eliminate or Minimize use of Guava if possible

2020-03-25 Thread GitBox
vinothchandar commented on a change in pull request #1159: [HUDI-479] Eliminate 
or Minimize use of Guava if possible
URL: https://github.com/apache/incubator-hudi/pull/1159#discussion_r398322800
 
 

 ##
 File path: 
hudi-common/src/main/java/org/apache/hudi/common/util/CollectionUtils.java
 ##
 @@ -0,0 +1,132 @@
+/*
+ * 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.hudi.common.util;
+
+import java.util.Collections;
+import java.util.Iterator;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Objects;
+import java.util.Set;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+
+public class CollectionUtils {
+  /**
+   * Determines whether two iterators contain equal elements in the same 
order. More specifically,
+   * this method returns {@code true} if {@code iterator1} and {@code 
iterator2} contain the same
+   * number of elements and every element of {@code iterator1} is equal to the 
corresponding element
+   * of {@code iterator2}.
+   *
+   * Note that this will modify the supplied iterators, since they will 
have been advanced some
+   * number of elements forward.
+   */
+  public static boolean elementsEqual(Iterator iterator1, Iterator 
iterator2) {
+while (iterator1.hasNext()) {
+  if (!iterator2.hasNext()) {
+return false;
+  }
+  Object o1 = iterator1.next();
+  Object o2 = iterator2.next();
+  if (!Objects.equals(o1, o2)) {
+return false;
+  }
+}
+return !iterator2.hasNext();
+  }
+
+  @SafeVarargs
+  public static  Set createSetFromElements(final T... elements) {
+return Stream.of(elements).collect(Collectors.toSet());
+  }
+
+  public static  Map createImmutableMap(final K key, final V value) 
{
+return Collections.unmodifiableMap(Collections.singletonMap(key, value));
+  }
+
+  @SafeVarargs
+  public static  List createImmutableList(final T... elements) {
+return 
Collections.unmodifiableList(Stream.of(elements).collect(Collectors.toList()));
+  }
+
+  public static  Map createImmutableMap(final Map map) {
+return Collections.unmodifiableMap(map);
+  }
+
+  @SafeVarargs
+  public static  Set createImmutableSet(final T... elements) {
+return 
Collections.unmodifiableSet(Stream.of(elements).collect(Collectors.toSet()));
+  }
+
+  public static  Set createImmutableSet(final Set set) {
+return Collections.unmodifiableSet(set);
+  }
+
+  public static  List createImmutableList(final List list) {
+return Collections.unmodifiableList(list);
+  }
+
+  private static Object[] checkElementsNotNull(Object... array) {
+return checkElementsNotNull(array, array.length);
+  }
+
+  private static Object[] checkElementsNotNull(Object[] array, int length) {
+for (int i = 0; i < length; i++) {
+  checkElementNotNull(array[i], i);
+}
+return array;
+  }
+
+  private static Object checkElementNotNull(Object element, int index) {
+if (element == null) {
+  throw new NullPointerException("at index " + index);
+}
+return element;
+  }
+
+  public static class Maps {
 
 Review comment:
   I am wondering if we can eliminate the need for this class and the builder 
class, but replacing with plain hashmaps inline? 
   - in places where a static HashMap is needed we can use the map 
initialization syntax I pasted above. 
   
   Don't feel very strongly about this,, but thinking if we can avoid builder 
patterns where it actually is not used that way.


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[GitHub] [incubator-hudi] vinothchandar commented on a change in pull request #1159: [HUDI-479] Eliminate or Minimize use of Guava if possible

2020-03-25 Thread GitBox
vinothchandar commented on a change in pull request #1159: [HUDI-479] Eliminate 
or Minimize use of Guava if possible
URL: https://github.com/apache/incubator-hudi/pull/1159#discussion_r398322962
 
 

 ##
 File path: 
hudi-common/src/main/java/org/apache/hudi/common/util/FileIOUtils.java
 ##
 @@ -91,4 +94,55 @@ public static void writeStringToFile(String str, String 
filePath) throws IOExcep
 out.flush();
 out.close();
   }
+
+  /**
+   * Closes a {@link Closeable}, with control over whether an {@code 
IOException} may be thrown.
 
 Review comment:
   did we reuse this code from somewhere?


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[GitHub] [incubator-hudi] vinothchandar commented on a change in pull request #1159: [HUDI-479] Eliminate or Minimize use of Guava if possible

2020-03-25 Thread GitBox
vinothchandar commented on a change in pull request #1159: [HUDI-479] Eliminate 
or Minimize use of Guava if possible
URL: https://github.com/apache/incubator-hudi/pull/1159#discussion_r398325200
 
 

 ##
 File path: 
hudi-common/src/main/java/org/apache/hudi/common/util/ReflectionUtils.java
 ##
 @@ -90,16 +99,58 @@ public static Object loadClass(String clazz, Object... 
constructorArgs) {
   }
 
   /**
-   * Return stream of top level class names in the same class path as 
passed-in class.
-   * 
-   * @param clazz
+   * Scans all classes accessible from the context class loader
+   * which belong to the given package and subpackages.
+   *
+   * @param clazz class
+   * @return Stream of Class names in package
*/
-  public static Stream getTopLevelClassesInClasspath(Class clazz) {
+  public static Stream getTopLevelClassesInClasspath(Class clazz) {
 
 Review comment:
   this method is just used by the dummy bundle main classes right.. Ideally, 
like to simplify this down the line. if you agree, we can raise a JIRA? 


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[GitHub] [incubator-hudi] vinothchandar commented on a change in pull request #1159: [HUDI-479] Eliminate or Minimize use of Guava if possible

2020-03-25 Thread GitBox
vinothchandar commented on a change in pull request #1159: [HUDI-479] Eliminate 
or Minimize use of Guava if possible
URL: https://github.com/apache/incubator-hudi/pull/1159#discussion_r398321995
 
 

 ##
 File path: 
hudi-common/src/main/java/org/apache/hudi/common/util/CollectionUtils.java
 ##
 @@ -0,0 +1,132 @@
+/*
+ * 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.hudi.common.util;
+
+import java.util.Collections;
+import java.util.Iterator;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Objects;
+import java.util.Set;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+
+public class CollectionUtils {
+  /**
+   * Determines whether two iterators contain equal elements in the same 
order. More specifically,
+   * this method returns {@code true} if {@code iterator1} and {@code 
iterator2} contain the same
+   * number of elements and every element of {@code iterator1} is equal to the 
corresponding element
+   * of {@code iterator2}.
+   *
+   * Note that this will modify the supplied iterators, since they will 
have been advanced some
+   * number of elements forward.
+   */
+  public static boolean elementsEqual(Iterator iterator1, Iterator 
iterator2) {
+while (iterator1.hasNext()) {
+  if (!iterator2.hasNext()) {
+return false;
+  }
+  Object o1 = iterator1.next();
+  Object o2 = iterator2.next();
+  if (!Objects.equals(o1, o2)) {
+return false;
+  }
+}
+return !iterator2.hasNext();
+  }
+
+  @SafeVarargs
+  public static  Set createSetFromElements(final T... elements) {
+return Stream.of(elements).collect(Collectors.toSet());
+  }
+
+  public static  Map createImmutableMap(final K key, final V value) 
{
+return Collections.unmodifiableMap(Collections.singletonMap(key, value));
+  }
+
+  @SafeVarargs
+  public static  List createImmutableList(final T... elements) {
+return 
Collections.unmodifiableList(Stream.of(elements).collect(Collectors.toList()));
+  }
+
+  public static  Map createImmutableMap(final Map map) {
+return Collections.unmodifiableMap(map);
+  }
+
+  @SafeVarargs
+  public static  Set createImmutableSet(final T... elements) {
+return 
Collections.unmodifiableSet(Stream.of(elements).collect(Collectors.toSet()));
+  }
+
+  public static  Set createImmutableSet(final Set set) {
+return Collections.unmodifiableSet(set);
+  }
+
+  public static  List createImmutableList(final List list) {
+return Collections.unmodifiableList(list);
+  }
+
+  private static Object[] checkElementsNotNull(Object... array) {
+return checkElementsNotNull(array, array.length);
+  }
+
+  private static Object[] checkElementsNotNull(Object[] array, int length) {
+for (int i = 0; i < length; i++) {
+  checkElementNotNull(array[i], i);
+}
+return array;
+  }
+
+  private static Object checkElementNotNull(Object element, int index) {
+if (element == null) {
 
 Review comment:
   just call Objects.requireNonNull(obj, string) ? 


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[GitHub] [incubator-hudi] vinothchandar commented on a change in pull request #1159: [HUDI-479] Eliminate or Minimize use of Guava if possible

2020-03-25 Thread GitBox
vinothchandar commented on a change in pull request #1159: [HUDI-479] Eliminate 
or Minimize use of Guava if possible
URL: https://github.com/apache/incubator-hudi/pull/1159#discussion_r398323935
 
 

 ##
 File path: 
hudi-common/src/main/java/org/apache/hudi/common/util/ReflectionUtils.java
 ##
 @@ -21,21 +21,30 @@
 import org.apache.hudi.common.model.HoodieRecordPayload;
 import org.apache.hudi.exception.HoodieException;
 
-import com.google.common.reflect.ClassPath;
-import com.google.common.reflect.ClassPath.ClassInfo;
+import org.slf4j.Logger;
 
 Review comment:
   I think we use log4j directly?


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[GitHub] [incubator-hudi] vinothchandar commented on a change in pull request #1159: [HUDI-479] Eliminate or Minimize use of Guava if possible

2020-03-25 Thread GitBox
vinothchandar commented on a change in pull request #1159: [HUDI-479] Eliminate 
or Minimize use of Guava if possible
URL: https://github.com/apache/incubator-hudi/pull/1159#discussion_r398318223
 
 

 ##
 File path: 
hudi-cli/src/test/java/org/apache/hudi/cli/common/HoodieTestCommitMetadataGenerator.java
 ##
 @@ -95,10 +96,9 @@ public static HoodieCommitMetadata 
generateCommitMetadata(String basePath) throw
 HoodieTestUtils.createNewDataFile(basePath, 
DEFAULT_FIRST_PARTITION_PATH, "000");
 String file1P1C0 =
 HoodieTestUtils.createNewDataFile(basePath, 
DEFAULT_SECOND_PARTITION_PATH, "000");
-return generateCommitMetadata(new ImmutableMap.Builder()
-  .put(DEFAULT_FIRST_PARTITION_PATH, new 
ImmutableList.Builder<>().add(file1P0C0).build())
-  .put(DEFAULT_SECOND_PARTITION_PATH, new 
ImmutableList.Builder<>().add(file1P1C0).build())
-  .build());
+return generateCommitMetadata(new Maps.MapBuilder>()
 
 Review comment:
   this can just be replaced with a in-place Map construction syntax ?
   
   ```
   Map doubleBraceMap  = new HashMap() {{
   put("key1", "value1");
   put("key2", "value2");
   }};
   ```


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[GitHub] [incubator-hudi] vinothchandar commented on a change in pull request #1159: [HUDI-479] Eliminate or Minimize use of Guava if possible

2019-12-31 Thread GitBox
vinothchandar commented on a change in pull request #1159: [HUDI-479] Eliminate 
or Minimize use of Guava if possible
URL: https://github.com/apache/incubator-hudi/pull/1159#discussion_r362295605
 
 

 ##
 File path: 
hudi-client/src/main/java/org/apache/hudi/table/RollbackExecutor.java
 ##
 @@ -217,7 +216,7 @@ private HoodieRollbackStat 
mergeRollbackStat(HoodieRollbackStat stat1, HoodieRol
 
   private Map generateHeader(String commit) {
 // generate metadata
-Map header = Maps.newHashMap();
+Map header = new HashMap<>();
 
 Review comment:
   good call. Still moving this in some form to a common class would be good.


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[GitHub] [incubator-hudi] vinothchandar commented on a change in pull request #1159: [HUDI-479] Eliminate or Minimize use of Guava if possible

2019-12-31 Thread GitBox
vinothchandar commented on a change in pull request #1159: [HUDI-479] Eliminate 
or Minimize use of Guava if possible
URL: https://github.com/apache/incubator-hudi/pull/1159#discussion_r362271984
 
 

 ##
 File path: 
hudi-client/src/main/java/org/apache/hudi/index/bloom/BloomIndexFileInfo.java
 ##
 @@ -78,23 +78,21 @@ public boolean equals(Object o) {
 }
 
 BloomIndexFileInfo that = (BloomIndexFileInfo) o;
-return Objects.equal(that.fileId, fileId) && 
Objects.equal(that.minRecordKey, minRecordKey)
-&& Objects.equal(that.maxRecordKey, maxRecordKey);
+return Objects.equals(that.fileId, fileId) && 
Objects.equals(that.minRecordKey, minRecordKey)
+&& Objects.equals(that.maxRecordKey, maxRecordKey);
 
   }
 
   @Override
   public int hashCode() {
-return Objects.hashCode(fileId, minRecordKey, maxRecordKey);
+return Objects.hash(fileId, minRecordKey, maxRecordKey);
   }
 
   @Override
   public String toString() {
-final StringBuilder sb = new StringBuilder("BloomIndexFileInfo {");
-sb.append(" fileId=").append(fileId);
-sb.append(" minRecordKey=").append(minRecordKey);
-sb.append(" maxRecordKey=").append(maxRecordKey);
-sb.append('}');
-return sb.toString();
+return "BloomIndexFileInfo {" + " fileId=" + fileId
 
 Review comment:
   why this change? StringBuilder reuses allocation right? 


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[GitHub] [incubator-hudi] vinothchandar commented on a change in pull request #1159: [HUDI-479] Eliminate or Minimize use of Guava if possible

2019-12-31 Thread GitBox
vinothchandar commented on a change in pull request #1159: [HUDI-479] Eliminate 
or Minimize use of Guava if possible
URL: https://github.com/apache/incubator-hudi/pull/1159#discussion_r362274816
 
 

 ##
 File path: hudi-integ-test/pom.xml
 ##
 @@ -117,7 +117,7 @@
 
   com.google.guava
   guava
-  20.0
+  15.0
 
 Review comment:
   why the downgrade? this should be fine for the integ test , if its passing 
consistently right 


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[GitHub] [incubator-hudi] vinothchandar commented on a change in pull request #1159: [HUDI-479] Eliminate or Minimize use of Guava if possible

2019-12-31 Thread GitBox
vinothchandar commented on a change in pull request #1159: [HUDI-479] Eliminate 
or Minimize use of Guava if possible
URL: https://github.com/apache/incubator-hudi/pull/1159#discussion_r362274938
 
 

 ##
 File path: pom.xml
 ##
 @@ -67,9 +67,9 @@
   
 
   
-2.6
+3.2.0
 
 Review comment:
   does the guava change need these version changes? 


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[GitHub] [incubator-hudi] vinothchandar commented on a change in pull request #1159: [HUDI-479] Eliminate or Minimize use of Guava if possible

2019-12-31 Thread GitBox
vinothchandar commented on a change in pull request #1159: [HUDI-479] Eliminate 
or Minimize use of Guava if possible
URL: https://github.com/apache/incubator-hudi/pull/1159#discussion_r362274606
 
 

 ##
 File path: 
hudi-common/src/test/java/org/apache/hudi/common/table/TestHoodieTableMetaClient.java
 ##
 @@ -120,7 +120,7 @@ public void checkArchiveCommitTimeline() throws 
IOException {
 HoodieInstant instant2 = new HoodieInstant(false, 
HoodieTimeline.COMMIT_ACTION, "2");
 HoodieInstant instant3 = new HoodieInstant(false, 
HoodieTimeline.COMMIT_ACTION, "3");
 
-assertEquals(Lists.newArrayList(instant1, instant2, instant3),
+assertEquals(Stream.of(instant1, instant2, 
instant3).collect(Collectors.toList()),
 
 Review comment:
   Arrays.asList()  instead? 


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[GitHub] [incubator-hudi] vinothchandar commented on a change in pull request #1159: [HUDI-479] Eliminate or Minimize use of Guava if possible

2019-12-31 Thread GitBox
vinothchandar commented on a change in pull request #1159: [HUDI-479] Eliminate 
or Minimize use of Guava if possible
URL: https://github.com/apache/incubator-hudi/pull/1159#discussion_r362273413
 
 

 ##
 File path: 
hudi-common/src/main/java/org/apache/hudi/common/model/HoodieKey.java
 ##
 @@ -58,20 +57,18 @@ public boolean equals(Object o) {
   return false;
 }
 HoodieKey otherKey = (HoodieKey) o;
-return Objects.equal(recordKey, otherKey.recordKey) && 
Objects.equal(partitionPath, otherKey.partitionPath);
+return Objects.equals(recordKey, otherKey.recordKey) && 
Objects.equals(partitionPath, otherKey.partitionPath);
   }
 
   @Override
   public int hashCode() {
-return Objects.hashCode(recordKey, partitionPath);
+return Objects.hash(recordKey, partitionPath);
   }
 
   @Override
   public String toString() {
-final StringBuilder sb = new StringBuilder("HoodieKey {");
 
 Review comment:
   same comment on string builder.. If we print the key in fast path (for 
debugging), the extra allocations would matter?


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[GitHub] [incubator-hudi] vinothchandar commented on a change in pull request #1159: [HUDI-479] Eliminate or Minimize use of Guava if possible

2019-12-31 Thread GitBox
vinothchandar commented on a change in pull request #1159: [HUDI-479] Eliminate 
or Minimize use of Guava if possible
URL: https://github.com/apache/incubator-hudi/pull/1159#discussion_r362273016
 
 

 ##
 File path: 
hudi-client/src/main/java/org/apache/hudi/io/compact/HoodieRealtimeTableCompactor.java
 ##
 @@ -125,7 +125,7 @@
 config.getCompactionReverseLogReadEnabled(), 
config.getMaxDFSStreamBufferSize(),
 config.getSpillableMapBasePath());
 if (!scanner.iterator().hasNext()) {
-  return Lists.newArrayList();
+  return new ArrayList<>();
 
 Review comment:
   how about Collections.emptyList() for new list creations? 


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[GitHub] [incubator-hudi] vinothchandar commented on a change in pull request #1159: [HUDI-479] Eliminate or Minimize use of Guava if possible

2019-12-31 Thread GitBox
vinothchandar commented on a change in pull request #1159: [HUDI-479] Eliminate 
or Minimize use of Guava if possible
URL: https://github.com/apache/incubator-hudi/pull/1159#discussion_r362273153
 
 

 ##
 File path: 
hudi-client/src/main/java/org/apache/hudi/table/RollbackExecutor.java
 ##
 @@ -217,7 +216,7 @@ private HoodieRollbackStat 
mergeRollbackStat(HoodieRollbackStat stat1, HoodieRol
 
   private Map generateHeader(String commit) {
 // generate metadata
-Map header = Maps.newHashMap();
+Map header = new HashMap<>();
 
 Review comment:
   Collections.emptyMap() works? Similarly, if we can pull this into our own 
`CollectionUtils` class, that would be useful to change later on? 


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[GitHub] [incubator-hudi] vinothchandar commented on a change in pull request #1159: [HUDI-479] Eliminate or Minimize use of Guava if possible

2019-12-31 Thread GitBox
vinothchandar commented on a change in pull request #1159: [HUDI-479] Eliminate 
or Minimize use of Guava if possible
URL: https://github.com/apache/incubator-hudi/pull/1159#discussion_r362272832
 
 

 ##
 File path: 
hudi-client/src/main/java/org/apache/hudi/io/compact/HoodieRealtimeTableCompactor.java
 ##
 @@ -112,8 +112,8 @@
 // loaded and load it using CompositeAvroLogReader
 // Since a DeltaCommit is not defined yet, reading all the records. 
revisit this soon.
 String maxInstantTime = metaClient
-
.getActiveTimeline().getTimelineOfActions(Sets.newHashSet(HoodieTimeline.COMMIT_ACTION,
-HoodieTimeline.ROLLBACK_ACTION, 
HoodieTimeline.DELTA_COMMIT_ACTION))
+
.getActiveTimeline().getTimelineOfActions(Stream.of(HoodieTimeline.COMMIT_ACTION,
 
 Review comment:
   Throw the set instantiation into a common `CollectionUtils#setOf()` in 
hudi-common ? This way we can change the implementation underneath later on if 
needed?


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