Mailing-List: contact issues-help@flink.apache.org; run by ezmlm
Precedence: bulk
Reply-To: dev@flink.apache.org
From: aljoscha <git@git.apache.org>
To: issues@flink.incubator.apache.org
Reply-To: issues@flink.incubator.apache.org
References: <git-pr-3336-flink@git.apache.org>
In-Reply-To: <git-pr-3336-flink@git.apache.org>
Subject: [GitHub] flink pull request #3336: [FLINK-4856][state] Add MapState in KeyedState
Content-Type: text/plain
Message-Id: <20170221101853.44F5EDFADC@git1-us-west.apache.org>
Date: Tue, 21 Feb 2017 10:18:53 +0000 (UTC)
archived-at: Tue, 21 Feb 2017 10:19:27 -0000

Github user aljoscha commented on a diff in the pull request:

    https://github.com/apache/flink/pull/3336#discussion_r102173582
  
    --- 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 --
    
    It was there initially because it would core dump in the very first version of the RocksDB backend otherwise. Not sure if this would still persist now. Maybe it was a problem with the cleanup.


---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at infrastructure@apache.org or file a JIRA ticket
with INFRA.
---