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https://issues.apache.org/jira/browse/FLINK-10041?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16576398#comment-16576398
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ASF GitHub Bot commented on FLINK-10041:
----------------------------------------
azagrebin commented on a change in pull request #6501: [FLINK-10041] Extract
iterators from RocksDBKeyedStateBackend (inner …
URL: https://github.com/apache/flink/pull/6501#discussion_r209283561
##########
File path:
flink-state-backends/flink-statebackend-rocksdb/src/main/java/org/apache/flink/contrib/streaming/state/iterator/RocksStateKeysIterator.java
##########
@@ -0,0 +1,137 @@
+/*
+ * 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.flink.contrib.streaming.state.iterator;
+
+import org.apache.flink.api.common.typeutils.TypeSerializer;
+import org.apache.flink.contrib.streaming.state.RocksDBKeySerializationUtils;
+import org.apache.flink.contrib.streaming.state.RocksIteratorWrapper;
+import org.apache.flink.core.memory.ByteArrayInputStreamWithPos;
+import org.apache.flink.core.memory.DataInputViewStreamWrapper;
+import org.apache.flink.util.FlinkRuntimeException;
+
+import javax.annotation.Nonnull;
+
+import java.util.Iterator;
+import java.util.NoSuchElementException;
+import java.util.Objects;
+
+/**
+ * Adapter class to bridge between {@link RocksIteratorWrapper} and {@link
Iterator} to iterate over the keys. This class
+ * is not thread safe.
+ *
+ * @param <K> the type of the iterated objects, which are keys in RocksDB.
+ */
+public class RocksStateKeysIterator<K> implements Iterator<K>, AutoCloseable {
+
+ @Nonnull
+ private final RocksIteratorWrapper iterator;
+
+ @Nonnull
+ private final String state;
+
+ @Nonnull
+ private final TypeSerializer<K> keySerializer;
+
+ @Nonnull
+ private final byte[] namespaceBytes;
+
+ private final boolean ambiguousKeyPossible;
+ private final int keyGroupPrefixBytes;
+ private K nextKey;
+ private K previousKey;
+
+ public RocksStateKeysIterator(
+ @Nonnull RocksIteratorWrapper iterator,
+ @Nonnull String state,
+ @Nonnull TypeSerializer<K> keySerializer,
+ int keyGroupPrefixBytes,
+ boolean ambiguousKeyPossible,
+ @Nonnull byte[] namespaceBytes) {
+ this.iterator = iterator;
+ this.state = state;
+ this.keySerializer = keySerializer;
+ this.keyGroupPrefixBytes = keyGroupPrefixBytes;
+ this.namespaceBytes = namespaceBytes;
+ this.nextKey = null;
+ this.previousKey = null;
+ this.ambiguousKeyPossible = ambiguousKeyPossible;
+ }
+
+ @Override
+ public boolean hasNext() {
+ try {
+ while (nextKey == null && iterator.isValid()) {
+
+ byte[] key = iterator.key();
+
+ ByteArrayInputStreamWithPos inputStream =
Review comment:
I would suggest to move deserialisation stuff into smaller method, like:
`Tuple2<K, Integer> deserKeyAndNamespacePos(byte[] keyBytes)`
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> Extract all different iterators (inner or static inner classes) into full
> classes
> ---------------------------------------------------------------------------------
>
> Key: FLINK-10041
> URL: https://issues.apache.org/jira/browse/FLINK-10041
> Project: Flink
> Issue Type: Sub-task
> Reporter: Stefan Richter
> Assignee: Stefan Richter
> Priority: Major
> Labels: pull-request-available
>
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