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| <h1> |
| <a id="quick-start" class="anchor" href="#quick-start" aria-hidden="true"><span aria-hidden="true" class="octicon octicon-link"></span></a>Quick Start</h1> |
| <p>This tutorial provides a quick introduction to using current integration/hive module.</p> |
| <h2> |
| <a id="prepare-carbondata-in-spark" class="anchor" href="#prepare-carbondata-in-spark" aria-hidden="true"><span aria-hidden="true" class="octicon octicon-link"></span></a>Prepare CarbonData in Spark</h2> |
| <ul> |
| <li> |
| <p>Create a sample.csv file using the following commands. The CSV file is required for loading data into CarbonData.</p> |
| <pre><code>cd carbondata |
| cat > sample.csv << EOF |
| id,name,scale,country,salary |
| 1,yuhai,1.77,china,33000.1 |
| 2,runlin,1.70,china,33000.2 |
| EOF |
| </code></pre> |
| </li> |
| <li> |
| <p>copy data to HDFS</p> |
| </li> |
| </ul> |
| <pre><code>$HADOOP_HOME/bin/hadoop fs -put sample.csv <hdfs store path>/sample.csv |
| </code></pre> |
| <ul> |
| <li>Add the following params to $SPARK_CONF_DIR/conf/hive-site.xml</li> |
| </ul> |
| <div class="highlight highlight-text-xml"><pre><<span class="pl-ent">property</span>> |
| <<span class="pl-ent">name</span>>hive.metastore.pre.event.listeners</<span class="pl-ent">name</span>> |
| <<span class="pl-ent">value</span>>org.apache.carbondata.hive.CarbonHiveMetastoreListener</<span class="pl-ent">value</span>> |
| </<span class="pl-ent">property</span>></pre></div> |
| <ul> |
| <li>Start Spark shell by running the following command in the Spark directory</li> |
| </ul> |
| <pre><code>./bin/spark-shell --jars <carbondata assembly jar path, carbon hive jar path> |
| </code></pre> |
| <pre><code>import org.apache.spark.sql.SparkSession |
| import org.apache.spark.sql.CarbonSession._ |
| val rootPath = "hdfs:///user/hadoop/carbon" |
| val storeLocation = s"$rootPath/store" |
| val warehouse = s"$rootPath/warehouse" |
| val metaStoreDB = s"$rootPath/metastore_db" |
| |
| val carbon = SparkSession.builder().enableHiveSupport().config("spark.sql.warehouse.dir", warehouse).config(org.apache.carbondata.core.constants.CarbonCommonConstants.STORE_LOCATION, storeLocation).getOrCreateCarbonSession(storeLocation, metaStoreDB) |
| |
| carbon.sql("create table hive_carbon(id int, name string, scale decimal, country string, salary double) STORED AS carbondata") |
| carbon.sql("LOAD DATA INPATH '<hdfs store path>/sample.csv' INTO TABLE hive_carbon") |
| scala>carbon.sql("SELECT * FROM hive_carbon").show() |
| </code></pre> |
| <h2> |
| <a id="configure-carbon-in-hive" class="anchor" href="#configure-carbon-in-hive" aria-hidden="true"><span aria-hidden="true" class="octicon octicon-link"></span></a>Configure Carbon in Hive</h2> |
| <h3> |
| <a id="configure-hive-classpath" class="anchor" href="#configure-hive-classpath" aria-hidden="true"><span aria-hidden="true" class="octicon octicon-link"></span></a>Configure hive classpath</h3> |
| <pre><code>mkdir hive/auxlibs/ |
| cp carbondata/assembly/target/scala-2.11/carbondata_2.11*.jar hive/auxlibs/ |
| cp carbondata/integration/hive/target/carbondata-hive-*.jar hive/auxlibs/ |
| cp $SPARK_HOME/jars/spark-catalyst*.jar hive/auxlibs/ |
| cp $SPARK_HOME/jars/scala*.jar hive/auxlibs/ |
| export HIVE_AUX_JARS_PATH=hive/auxlibs/ |
| </code></pre> |
| <h3> |
| <a id="fix-snappy-issue" class="anchor" href="#fix-snappy-issue" aria-hidden="true"><span aria-hidden="true" class="octicon octicon-link"></span></a>Fix snappy issue</h3> |
| <pre><code>copy snappy-java-xxx.jar from "./<SPARK_HOME>/jars/" to "./Library/Java/Extensions" |
| export HADOOP_OPTS="-Dorg.xerial.snappy.lib.path=/Library/Java/Extensions -Dorg.xerial.snappy.lib.name=libsnappyjava.jnilib -Dorg.xerial.snappy.tempdir=/Users/apple/DEMO/tmp" |
| </code></pre> |
| <h3> |
| <a id="carbon-jars-to-be-placed" class="anchor" href="#carbon-jars-to-be-placed" aria-hidden="true"><span aria-hidden="true" class="octicon octicon-link"></span></a>Carbon Jars to be placed</h3> |
| <pre><code>hive/lib/ (for hive server) |
| yarn/lib/ (for MapReduce) |
| |
| Carbon Jars to be copied to the above paths. |
| </code></pre> |
| <h3> |
| <a id="start-hive-beeline-to-query" class="anchor" href="#start-hive-beeline-to-query" aria-hidden="true"><span aria-hidden="true" class="octicon octicon-link"></span></a>Start hive beeline to query</h3> |
| <pre><code>$HIVE_HOME/bin/beeline |
| </code></pre> |
| <h3> |
| <a id="write-data-from-hive" class="anchor" href="#write-data-from-hive" aria-hidden="true"><span aria-hidden="true" class="octicon octicon-link"></span></a>Write data from hive</h3> |
| <ul> |
| <li>Write data from hive into carbondata format.</li> |
| </ul> |
| <pre><code>create table hive_carbon(id int, name string, scale decimal, country string, salary double) stored by 'org.apache.carbondata.hive.CarbonStorageHandler'; |
| insert into hive_carbon select * from parquetTable; |
| </code></pre> |
| <p><strong>Note</strong>: Only non-transactional tables are supported when created through hive. This means that the standard carbon folder structure would not be followed and all files would be written in a flat folder structure.</p> |
| <h3> |
| <a id="query-data-from-hive" class="anchor" href="#query-data-from-hive" aria-hidden="true"><span aria-hidden="true" class="octicon octicon-link"></span></a>Query data from hive</h3> |
| <ul> |
| <li>This is to read the carbon table through Hive. It is the integration of the carbon with Hive.</li> |
| </ul> |
| <pre><code>set hive.mapred.supports.subdirectories=true; |
| set mapreduce.dir.recursive=true; |
| These properties helps to recursively traverse through the directories to read the carbon folder structure. |
| </code></pre> |
| <h3> |
| <a id="example" class="anchor" href="#example" aria-hidden="true"><span aria-hidden="true" class="octicon octicon-link"></span></a>Example</h3> |
| <pre><code> - Query the table |
| select * from hive_carbon; |
| select count(*) from hive_carbon; |
| select * from hive_carbon order by id; |
| </code></pre> |
| <h3> |
| <a id="note" class="anchor" href="#note" aria-hidden="true"><span aria-hidden="true" class="octicon octicon-link"></span></a>Note</h3> |
| <ul> |
| <li>Partition table support is not handled</li> |
| </ul> |
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