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Posted to dev@storm.apache.org by HeartSaVioR <gi...@git.apache.org> on 2017/04/01 12:31:46 UTC
[GitHub] storm pull request #1970: STORM-2383 Support HBase as state backend (1.x)
Github user HeartSaVioR commented on a diff in the pull request:
https://github.com/apache/storm/pull/1970#discussion_r109284284
--- Diff: external/storm-hbase/src/main/java/org/apache/storm/hbase/state/HBaseKeyValueState.java ---
@@ -0,0 +1,399 @@
+/*
+ * 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.storm.hbase.state;
+
+import org.apache.hadoop.hbase.client.Delete;
+import org.apache.hadoop.hbase.client.Durability;
+import org.apache.hadoop.hbase.client.Get;
+import org.apache.hadoop.hbase.client.Mutation;
+import org.apache.hadoop.hbase.client.Result;
+import org.apache.storm.hbase.bolt.mapper.HBaseProjectionCriteria;
+import org.apache.storm.hbase.common.ColumnList;
+import org.apache.storm.hbase.common.HBaseClient;
+import org.apache.storm.hbase.utils.HBaseEncoder;
+import org.apache.storm.state.DefaultStateSerializer;
+import org.apache.storm.state.KeyValueState;
+import org.apache.storm.state.Serializer;
+import org.apache.storm.utils.ByteArrayUtil;
+import org.apache.storm.utils.ByteArrayWrapper;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.Iterator;
+import java.util.List;
+import java.util.Map;
+import java.util.NavigableMap;
+import java.util.concurrent.ConcurrentHashMap;
+
+/**
+ * A Hbase based implementation that persists the state in HBase.
+ */
+public class HBaseKeyValueState<K, V> implements KeyValueState<K, V> {
+ private static final Logger LOG = LoggerFactory.getLogger(HBaseKeyValueState.class);
+
+ private static final ByteArrayWrapper COMMIT_TXID_KEY = new ByteArrayWrapper("commit".getBytes());
+ private static final ByteArrayWrapper PREPARE_TXID_KEY = new ByteArrayWrapper("prepare".getBytes());
+
+ private final byte[] namespace;
+ private final byte[] prepareNamespace;
+ private final byte[] txidNamespace;
+ private final byte[] columnFamily;
+ private final HBaseEncoder<K, V> encoder;
+ private final HBaseClient hBaseClient;
+
+ private Map<ByteArrayWrapper, byte[]> pendingPrepare;
+ private Map<ByteArrayWrapper, byte[]> pendingCommit;
+
+ // the key and value of txIds are guaranteed to be converted to UTF-8 encoded String
+ private Map<ByteArrayWrapper, byte[]> txIds;
+
+ public HBaseKeyValueState(HBaseClient hbaseClient, String columnFamily, String namespace) {
+ this(hbaseClient, columnFamily, namespace, new DefaultStateSerializer<K>(), new DefaultStateSerializer<V>());
+ }
+
+ public HBaseKeyValueState(HBaseClient hBaseClient, String columnFamily, String namespace,
+ Serializer<K> keySerializer, Serializer<V> valueSerializer) {
+
+ this.hBaseClient = hBaseClient;
+ this.columnFamily = columnFamily.getBytes();
+ this.namespace = namespace.getBytes();
+ this.prepareNamespace = (namespace + "$prepare").getBytes();
+ this.txidNamespace = (namespace + "$txid").getBytes();
+ this.encoder = new HBaseEncoder<K, V>(keySerializer, valueSerializer);
+ this.pendingPrepare = createPendingPrepareMap();
+ initTxids();
+ initPendingCommit();
+ }
+
+ private void initTxids() {
+ HBaseProjectionCriteria criteria = new HBaseProjectionCriteria();
+ criteria.addColumnFamily(columnFamily);
+ Get get = hBaseClient.constructGetRequests(txidNamespace, criteria);
+ try {
+ Result[] results = hBaseClient.batchGet(Collections.singletonList(get));
+ Result result = results[0];
+ if (!result.isEmpty()) {
+ NavigableMap<byte[], byte[]> familyMap = result.getFamilyMap(columnFamily);
+ txIds = ByteArrayUtil.Maps.newHashMapWrappingKey(familyMap);
+ } else {
+ txIds = new HashMap<>();
+ }
+
+ LOG.debug("initTxids, txIds {}", txIds);
+ } catch (Exception e) {
+ throw new RuntimeException(e);
+ }
+ }
+
+ private void initPendingCommit() {
+ HBaseProjectionCriteria criteria = new HBaseProjectionCriteria();
+ criteria.addColumnFamily(columnFamily);
+ Get get = hBaseClient.constructGetRequests(prepareNamespace, criteria);
+ try {
+ Result[] results = hBaseClient.batchGet(Collections.singletonList(get));
+ Result result = results[0];
+ if (!result.isEmpty()) {
+ LOG.debug("Loading previously prepared commit from {}", prepareNamespace);
+ NavigableMap<byte[], byte[]> familyMap = result.getFamilyMap(columnFamily);
+ pendingCommit = ByteArrayUtil.Maps.newHashMapWrappingKey(familyMap);
+ } else {
+ LOG.debug("No previously prepared commits.");
+ pendingCommit = Collections.emptyMap();
+ }
+ } catch (Exception e) {
+ throw new RuntimeException(e);
+ }
+ }
+
+ @Override
+ public void put(K key, V value) {
+ LOG.debug("put key '{}', value '{}'", key, value);
+ byte[] columnKey = encoder.encodeKey(key);
+ byte[] columnValue = encoder.encodeValue(value);
+ pendingPrepare.put(new ByteArrayWrapper(columnKey), columnValue);
+ }
+
+ @Override
+ public V get(K key) {
+ LOG.debug("get key '{}'", key);
+ byte[] columnKey = encoder.encodeKey(key);
+ byte[] columnValue = null;
+
+ ByteArrayWrapper wrappedKey = new ByteArrayWrapper(columnKey);
+ if (pendingPrepare.containsKey(wrappedKey)) {
+ columnValue = pendingPrepare.get(wrappedKey);
+ } else if (pendingCommit.containsKey(wrappedKey)) {
+ columnValue = pendingCommit.get(wrappedKey);
+ } else {
+ HBaseProjectionCriteria criteria = new HBaseProjectionCriteria();
+ HBaseProjectionCriteria.ColumnMetaData column = new HBaseProjectionCriteria.ColumnMetaData(columnFamily, columnKey);
+ criteria.addColumn(column);
+ Get get = hBaseClient.constructGetRequests(namespace, criteria);
+ try {
+ Result[] results = hBaseClient.batchGet(Collections.singletonList(get));
+ Result result = results[0];
+ columnValue = result.getValue(column.getColumnFamily(), column.getQualifier());
+ } catch (Exception e) {
+ throw new RuntimeException(e);
+ }
+ }
+ V value = null;
+ if (columnValue != null) {
+ value = encoder.decodeValue(columnValue);
+ }
+ LOG.debug("Value for key '{}' is '{}'", key, value);
+ return value;
+ }
+
+ @Override
+ public V get(K key, V defaultValue) {
+ V val = get(key);
+ return val != null ? val : defaultValue;
+ }
+
+ @Override
+ public V delete(K key) {
+ LOG.debug("delete key '{}'", key);
+ byte[] columnKey = encoder.encodeKey(key);
+ V curr = get(key);
+ pendingPrepare.put(new ByteArrayWrapper(columnKey), HBaseEncoder.TOMBSTONE);
+ return curr;
+ }
+
+ @Override
+ public Iterator<Map.Entry<K, V>> iterator() {
+ // TODO: is it possible to implement this correctly?
--- End diff --
OK. Filed [STORM-2449](https://issues.apache.org/jira/browse/STORM-2449).
I'll apply the approach to this PR, too.
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