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From StefanRRichter <...@git.apache.org>
Subject [GitHub] flink pull request #3336: [FLINK-4856][state] Add MapState in KeyedState
Date Mon, 20 Feb 2017 14:08:26 GMT
Github user StefanRRichter commented on a diff in the pull request:

    --- Diff: flink-contrib/flink-statebackend-rocksdb/src/main/java/org/apache/flink/contrib/streaming/state/RocksDBMapState.java
    @@ -0,0 +1,579 @@
    + * 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
    + * <p/>
    + * http://www.apache.org/licenses/LICENSE-2.0
    + * <p/>
    + * 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;
    +import org.apache.flink.api.common.state.MapState;
    +import org.apache.flink.api.common.state.MapStateDescriptor;
    +import org.apache.flink.api.common.typeutils.TypeSerializer;
    +import org.apache.flink.api.java.tuple.Tuple2;
    +import org.apache.flink.api.java.tuple.Tuple3;
    +import org.apache.flink.api.java.tuple.Tuple4;
    +import org.apache.flink.core.memory.ByteArrayInputStreamWithPos;
    +import org.apache.flink.core.memory.ByteArrayOutputStreamWithPos;
    +import org.apache.flink.core.memory.DataInputViewStreamWrapper;
    +import org.apache.flink.core.memory.DataOutputViewStreamWrapper;
    +import org.apache.flink.runtime.query.netty.message.KvStateRequestSerializer;
    +import org.apache.flink.runtime.state.KeyGroupRangeAssignment;
    +import org.apache.flink.runtime.state.internal.InternalMapState;
    +import org.apache.flink.util.Preconditions;
    +import org.rocksdb.ColumnFamilyHandle;
    +import org.rocksdb.RocksDB;
    +import org.rocksdb.RocksDBException;
    +import org.rocksdb.RocksIterator;
    +import org.rocksdb.WriteOptions;
    +import java.io.IOException;
    +import java.util.ArrayList;
    +import java.util.Iterator;
    +import java.util.Map;
    + * {@link MapState} implementation that stores state in RocksDB.
    + * <p>
    + * <p>{@link RocksDBStateBackend} must ensure that we set the
    + * {@link org.rocksdb.StringAppendOperator} on the column family that we use for our
state since
    + * we use the {@code merge()} call.
    + *
    + * @param <K>  The type of the key.
    + * @param <N>  The type of the namespace.
    + * @param <UK> The type of the keys in the map state.
    + * @param <UV> The type of the values in the map state.
    + */
    +public class RocksDBMapState<K, N, UK, UV>
    +	extends AbstractRocksDBState<K, N, MapState<UK, UV>, MapStateDescriptor<UK,
UV>, Map<UK, UV>>
    +	implements InternalMapState<N, UK, UV> {
    +	/** Serializer for the keys and values */
    +	private final TypeSerializer<UK> userKeySerializer;
    +	private final TypeSerializer<UV> userValueSerializer;
    +	/**
    +	 * We disable writes to the write-ahead-log here. We can't have these in the base class
    +	 * because JNI segfaults for some reason if they are.
    +	 */
    +	private final WriteOptions writeOptions;
    --- End diff --
    This comment sounds a bit scary to me. Do you have any idea why this is happening? Besides
I am afraid that this might be a potential memory leak. A native object is created here through
JNI, but never explicitly closed.

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