Github user prashantkommireddi commented on a diff in the pull request:
https://github.com/apache/incubator-phoenix/pull/27#discussion_r11406210
--- Diff:
phoenix-pig/src/main/java/org/apache/phoenix/pig/PhoenixHBaseLoader.java ---
@@ -0,0 +1,251 @@
+/*
+ * 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 static org.apache.commons.lang.StringUtils.isEmpty;
+
+import java.io.IOException;
+import java.util.Properties;
+
+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.hbase.util.Pair;
+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.pig.hadoop.PhoenixInputFormat;
+import org.apache.phoenix.pig.hadoop.PhoenixRecord;
+import org.apache.pig.Expression;
+import org.apache.pig.LoadFunc;
+import org.apache.pig.LoadMetadata;
+import org.apache.pig.PigException;
+import org.apache.pig.ResourceSchema;
+import org.apache.pig.ResourceStatistics;
+import org.apache.pig.backend.executionengine.ExecException;
+import
org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigSplit;
+import org.apache.pig.data.Tuple;
+import org.apache.pig.impl.util.ObjectSerializer;
+import org.apache.pig.impl.util.UDFContext;
+
+import com.google.common.base.Preconditions;
+
+/**
+ * LoadFunc to load data from HBase using Phoenix .
+ *
+ * Example usage:
+ * a) TABLE
+ * i) A = load 'hbase://table/HIRES' using
+ * org.apache.phoenix.pig.PhoenixHBaseLoader('localhost');
+ *
+ * The above loads the data from a table 'HIRES'
+ *
+ * ii) A = load 'hbase://table/HIRES/id,name' using
+ * org.apache.phoenix.pig.PhoenixHBaseLoader('localhost');
+ *
+ * Here, only id, name are returned from the table HIRES as part of
LOAD.
+ *
+ * b) QUERY
+ * i) 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 implements
LoadMetadata {
+
+ private static final Log LOG =
LogFactory.getLog(PhoenixHBaseLoader.class);
+ private static final String PHOENIX_TABLE_NAME_SCHEME =
"hbase://table/";
+ private static final String PHOENIX_QUERY_SCHEME =
"hbase://query/";
+ private static final String RESOURCE_SCHEMA_SIGNATURE =
"phoenix.pig.schema";
+
+ private PhoenixPigConfiguration config;
+ private String tableName;
+ private String selectQuery;
+ private String zkQuorum ;
+ private PhoenixInputFormat inputFormat;
+ private RecordReader<NullWritable, PhoenixRecord> reader;
+ private String contextSignature;
+ private ResourceSchema schema;
+
+ /**
+ * @param zkQuorum
+ */
+ public PhoenixHBaseLoader(String zkQuorum) {
+ super();
+ Preconditions.checkNotNull(zkQuorum);
+ Preconditions.checkState(zkQuorum.length() > 0, "Zookeeper quorum
cannot be empty!");
+ this.zkQuorum = zkQuorum;
+ }
+
+ @Override
+ public void setLocation(String location, Job job) throws IOException {
+
+ final Configuration configuration = job.getConfiguration();
+ //explicitly turning off combining splits.
+ configuration.setBoolean("pig.noSplitCombination", true);
+ this.initializePhoenixPigConfiguration(location, configuration);
+ }
+
+ /**
+ * Initialize PhoenixPigConfiguration iff it is null. Called by {@link
#setLocation} and {@link #getSchema}
+ * @param location
+ * @param configuration
+ * @throws PigException
+ */
+ private void initializePhoenixPigConfiguration(final String location,
final Configuration configuration) throws PigException {
+ if(this.config != null) {
+ return;
+ }
+ this.config = new PhoenixPigConfiguration(configuration);
+ this.config.setServerName(this.zkQuorum);
+ Pair<String,String> pair = null;
+ try {
+ if (location.startsWith(PHOENIX_TABLE_NAME_SCHEME)) {
+ String tableSchema =
location.substring(PHOENIX_TABLE_NAME_SCHEME.length());
+ final TableSchemaParserFunction parseFunction = new
TableSchemaParserFunction();
+ pair = parseFunction.apply(tableSchema);
+ } else if (location.startsWith(PHOENIX_QUERY_SCHEME)) {
+ this.selectQuery =
location.substring(PHOENIX_QUERY_SCHEME.length());
+ final QuerySchemaParserFunction queryParseFunction = new
QuerySchemaParserFunction(this.config);
+ pair = queryParseFunction.apply(this.selectQuery);
+ config.setSelectStatement(this.selectQuery);
+ }
+ this.tableName = pair.getFirst();
+ final String selectedColumns = pair.getSecond();
+
+ if(isEmpty(this.tableName) && isEmpty(this.selectQuery)) {
+ printUsage(location);
+ }
+ this.config.setTableName(this.tableName);
+ if(!isEmpty(selectedColumns)) {
+ this.config.setSelectColumns(selectedColumns);
+ }
+ } catch(IllegalArgumentException iae) {
+ printUsage(location);
+ }
+ }
+
+
+ @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;
+ final String resourceSchemaAsStr =
getValueFromUDFContext(this.contextSignature,RESOURCE_SCHEMA_SIGNATURE);
+ if (resourceSchemaAsStr == null) {
+ throw new IOException("Could not find schema in UDF context");
+ }
+ schema =
(ResourceSchema)ObjectSerializer.deserialize(resourceSchemaAsStr);
+ }
+
+ /*
+ * @see
org.apache.pig.LoadFunc#setUDFContextSignature(java.lang.String)
+ */
+ @Override
+ public void setUDFContextSignature(String signature) {
+ this.contextSignature = signature;
+ }
+
+ @Override
+ public Tuple getNext() throws IOException {
+ try {
+ if(!reader.nextKeyValue()) {
+ return null;
+ }
+ final PhoenixRecord phoenixRecord = reader.getCurrentValue();
+ if(phoenixRecord == null) {
+ return null;
+ }
+ final Tuple tuple =
TypeUtil.transformToTuple(phoenixRecord,schema.getFields());
+ return tuple;
+ } catch (InterruptedException e) {
+ int errCode = 6018;
+ final String errMsg = "Error while reading input";
+ throw new ExecException(errMsg,
errCode,PigException.REMOTE_ENVIRONMENT, e);
+ }
+ }
+
+ private void printUsage(final String location) throws PigException {
+ String locationErrMsg = String.format("The input location in load
statement should be of the form " +
+ "%s<table name> or %s<query>. Got [%s]
",PHOENIX_TABLE_NAME_SCHEME,PHOENIX_QUERY_SCHEME,location);
+ LOG.error(locationErrMsg);
+ throw new PigException(locationErrMsg);
+ }
+
+ @Override
+ public ResourceSchema getSchema(String location, Job job) throws
IOException {
+ if(schema != null) {
+ return schema;
+ }
+ final Configuration configuration = job.getConfiguration();
+ LOG.info(" In getSchema where phoenixConfiguration ");
--- End diff --
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