Github user prashantkommireddi commented on a diff in the pull request:
https://github.com/apache/incubator-phoenix/pull/22#discussion_r10812397
--- Diff:
phoenix-pig/src/main/java/org/apache/phoenix/pig/PhoenixHBaseLoader.java ---
@@ -0,0 +1,190 @@
+/*
+ * Copyright 2010 The Apache Software Foundation
+ *
+ * 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 maynot 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 applicablelaw 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.phoenix.pig;
+
+import java.io.IOException;
+import java.sql.Connection;
+import java.sql.SQLException;
+import java.sql.Statement;
+
+import org.apache.commons.lang.StringUtils;
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.fs.Path;
+import org.apache.hadoop.io.NullWritable;
+import org.apache.hadoop.mapreduce.InputFormat;
+import org.apache.hadoop.mapreduce.Job;
+import org.apache.hadoop.mapreduce.RecordReader;
+import org.apache.phoenix.compile.QueryPlan;
+import org.apache.phoenix.jdbc.PhoenixStatement;
+import org.apache.phoenix.pig.hadoop.PhoenixInputFormat;
+import org.apache.phoenix.pig.hadoop.PhoenixRecord;
+import org.apache.pig.LoadFunc;
+import org.apache.pig.PigException;
+import org.apache.pig.backend.executionengine.ExecException;
+import
org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigSplit;
+import org.apache.pig.data.Tuple;
+
+import com.google.common.base.Preconditions;
+import com.google.common.base.Throwables;
+
+/**
+ * LoadFunc to load data from HBase using Phoenix .
+ *
+ * Example usage:
+ * a) A = load 'hbase://table/HIRES' using
+ * org.apache.phoenix.pig.PhoenixHBaseLoader('localhost');
+ *
+ * The above loads the data from a table 'HIRES'
+ *
+ * b) B = load 'hbase://query/SELECT fname,lname FROM HIRES' using
+ * org.apache.phoenix.pig.PhoenixHBaseLoader('localhost');
+ *
+ * The above loads fname and lname columns from 'HIRES' table.
+ *
+ */
+public final class PhoenixHBaseLoader extends LoadFunc{
+
+ private static final Log LOG =
LogFactory.getLog(PhoenixHBaseLoader.class);
+ private static final String PHOENIX_TABLE_NAME_TEMPLATE =
"hbase://table/";
+ private static final String PHOENIX_QUERY_TEMPLATE =
"hbase://query/";
+
+ private PhoenixPigConfiguration config;
+ private String tableName;
+ private String selectQuery;
+ private String zkQuorum ;
+ private PhoenixInputFormat inputFormat;
+ private RecordReader<NullWritable, PhoenixRecord> reader;
+
+
+ /**
+ * @param zkQuorum
+ */
+ public PhoenixHBaseLoader(String zkQuorum) {
+ super();
+ this.zkQuorum = zkQuorum;
+ }
+
+ @Override
+ public void setLocation(String location, Job job) throws IOException {
+
+ final Configuration configuration = job.getConfiguration();
+ if (location.startsWith(PHOENIX_TABLE_NAME_TEMPLATE)) {
+ tableName =
location.substring(PHOENIX_TABLE_NAME_TEMPLATE.length());
+ configuration.set(PhoenixPigConfiguration.TABLE_NAME,
tableName);
+ } else if (location.startsWith(PHOENIX_QUERY_TEMPLATE)) {
+ selectQuery =
location.substring(PHOENIX_QUERY_TEMPLATE.length());
+ configuration.set(PhoenixPigConfiguration.SELECT_STATEMENT,
selectQuery);
+ }
+ if(StringUtils.isEmpty(this.tableName) &&
StringUtils.isEmpty(this.selectQuery)) {
+ printUsage(location);
+ }
+ configuration.set(PhoenixPigConfiguration.SERVER_NAME,
this.zkQuorum);
+ this.config = new PhoenixPigConfiguration(configuration);
+ // when sql query is given.
+ if(StringUtils.isEmpty(this.tableName)) {
+ try {
+ this.tableName =
getTableNameFromSelectQuery(config.getConnection(false), this.selectQuery);
+
config.getConfiguration().set(PhoenixPigConfiguration.TABLE_NAME,
this.tableName);
+ } catch (SQLException e) {
+
LOG.error(org.apache.hadoop.util.StringUtils.stringifyException(e));
+ Throwables.propagate(e);
+ }
+ }
+ }
+
+ @Override
+ public String relativeToAbsolutePath(String location, Path curDir)
throws IOException {
+ return location;
+ }
+
+ @Override
+ public InputFormat getInputFormat() throws IOException {
+ if(inputFormat == null) {
+ inputFormat = new PhoenixInputFormat();
+ }
+ return inputFormat;
+ }
+
+ @SuppressWarnings("unchecked")
+ @Override
+ public void prepareToRead(RecordReader reader, PigSplit split) throws
IOException {
+ this.reader = reader;
+ }
+
+ @Override
+ public Tuple getNext() throws IOException {
+ try {
+ if(!reader.nextKeyValue()) {
+ return null;
+ }
+ final PhoenixRecord value = reader.getCurrentValue();
+ if(value == null) {
+ return null;
+ }
+ final Tuple tuple =
TypeUtil.transformToTuple(value,value.getProjectedColumns());
+ return tuple;
+ } catch (InterruptedException e) {
+ int errCode = 6018;
+ final String errMsg = "Error while reading input";
+ throw new ExecException(errMsg,
errCode,PigException.REMOTE_ENVIRONMENT, e);
--- End diff --
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