/tags/release-0.0.0-rc0/hive/external/hbase-handler/src/java/org/apache/hadoop/hive/hbase/HBaseStatsPublisher.java
Java | 140 lines | 87 code | 20 blank | 33 comment | 5 complexity | 3c75f4a15cc7c20ab3581169045b3b72 MD5 | raw file
Possible License(s): Apache-2.0, BSD-3-Clause, JSON, CPL-1.0
- /**
- * 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.hadoop.hive.hbase;
- import java.io.IOException;
- import org.apache.commons.logging.Log;
- import org.apache.commons.logging.LogFactory;
- import org.apache.hadoop.conf.Configuration;
- import org.apache.hadoop.hbase.HBaseConfiguration;
- import org.apache.hadoop.hbase.HColumnDescriptor;
- import org.apache.hadoop.hbase.HTableDescriptor;
- import org.apache.hadoop.hbase.client.Get;
- import org.apache.hadoop.hbase.client.HBaseAdmin;
- import org.apache.hadoop.hbase.client.HTable;
- import org.apache.hadoop.hbase.client.Put;
- import org.apache.hadoop.hbase.client.Result;
- import org.apache.hadoop.hbase.client.RowLock;
- import org.apache.hadoop.hbase.util.Bytes;
- import org.apache.hadoop.hive.ql.stats.*;
- /**
- * A class that implements the StatsPublisher interface through HBase.
- */
- public class HBaseStatsPublisher implements StatsPublisher {
- private HTable htable;
- private byte[] rowCountFamily, rowCountColumn;
- private final Log LOG = LogFactory.getLog(this.getClass().getName());
- /**
- * Does the necessary HBase initializations.
- */
- public boolean connect(Configuration hiveconf) {
- try {
- HBaseConfiguration hbaseConf = new HBaseConfiguration(hiveconf);
- HBaseAdmin hbase = new HBaseAdmin(hbaseConf);
- rowCountFamily = Bytes.toBytes(HBaseStatsSetupConstants.PART_STAT_ROW_COUNT_COLUMN_FAMILY);
- rowCountColumn = Bytes.toBytes(HBaseStatsSetupConstants.PART_STAT_ROW_COUNT_COLUMN_NAME);
- htable = new HTable(HBaseStatsSetupConstants.PART_STAT_TABLE_NAME);
- // for performance reason, defer update until the closeConnection
- htable.setAutoFlush(false);
- } catch (IOException e) {
- LOG.error("Error during HBase connection. " + e);
- return false;
- }
- return true;
- }
- /**
- * Writes temporary statistics into HBase;
- */
- public boolean publishStat(String rowID, String key, String value) {
- if (key != StatsSetupConst.ROW_COUNT) {
- LOG.warn("Warning. Invalid statistic. Currently " +
- "row count is the only supported statistic");
- return false;
- }
- // Write in HBase
- try {
- Get get = new Get(Bytes.toBytes(rowID));
- Result result = htable.get(get);
- int val = Integer.parseInt(value);
- int oldVal = 0;
- if (!result.isEmpty()) {
- oldVal = Integer.parseInt(Bytes.toString(result.getValue(rowCountFamily, rowCountColumn)));
- }
- if (oldVal < val) {
- Put row = new Put(Bytes.toBytes(rowID));
- row.add(rowCountFamily, rowCountColumn, Bytes.toBytes(Integer.toString(val)));
- htable.put(row);
- }
- return true;
- } catch (IOException e) {
- LOG.error("Error during publishing statistics. " + e);
- return false;
- }
- }
- public boolean closeConnection() {
- // batch update
- try {
- htable.flushCommits();
- return true;
- } catch (IOException e) {
- LOG.error("Cannot commit changes in stats publishing.", e);
- return false;
- }
- }
- /**
- * Does the necessary HBase initializations.
- */
- public boolean init(Configuration hiveconf) {
- try {
- HBaseConfiguration hbaseConf = new HBaseConfiguration(hiveconf);
- HBaseAdmin hbase = new HBaseAdmin(hbaseConf);
- rowCountFamily = Bytes.toBytes(HBaseStatsSetupConstants.PART_STAT_ROW_COUNT_COLUMN_FAMILY);
- rowCountColumn = Bytes.toBytes(HBaseStatsSetupConstants.PART_STAT_ROW_COUNT_COLUMN_NAME);
- // Creating table if not exists
- if (!hbase.tableExists(HBaseStatsSetupConstants.PART_STAT_TABLE_NAME)) {
- HTableDescriptor table = new HTableDescriptor(HBaseStatsSetupConstants.PART_STAT_TABLE_NAME);
- HColumnDescriptor rowCount = new HColumnDescriptor(rowCountFamily);
- table.addFamily(rowCount);
- hbase.createTable(table);
- }
- } catch (IOException e) {
- LOG.error("Error during HBase initialization. " + e);
- return false;
- }
- return true;
- }
- }