Spark SQL CLI描述
Spark SQL CLI的引入使得在SparkSQL中通過hive metastore就可以直接對hive進行查詢更加方便；當前版本中還不能使用Spark SQL CLI與ThriftServer進行交互。
使用Spark SQL CLI前需要注意：
1、將hive-site.xml配置文件拷貝到$SPARK_HOME/conf目錄下；
2、需要在$SPARK_HOME/conf/spark-env.sh中的SPARK_CLASSPATH添加jdbc驅動的jar包
export SPARK_CLASSPATH=$SPARK_CLASSPATH:/home/Hadoop/software/mysql-connector-java-5.1.27-bin.jar
Spark SQL CLI命令參數介紹：
cd $SPARK_HOME/bin
spark-sql --help
Usage: ./bin/spark-sql [options] [cli option]
Spark assembly has been built with Hive, including Datanucleus jars on classpath
Options:
--master MASTER_URL spark://host:port, mesos://host:port, yarn, or local.
--deploy-mode DEPLOY_MODE Whether to launch the driver program locally ("client") or
on one of the worker machines inside the cluster ("cluster")
(Default: client).
--class CLASS_NAME Your application's main class (for Java / Scala apps).
--name NAME A name of your application.
--jars JARS Comma-separated list of local jars to include on the driver
and executor classpaths.
--py-files PY_FILES Comma-separated list of .zip, .egg, or .py files to place
on the PYTHONPATH for Python apps.
--files FILES Comma-separated list of files to be placed in the working
directory of each executor.
--conf PROP=VALUE Arbitrary Spark configuration property.
--properties-file FILE Path to a file from which to load extra properties. If not
specified, this will look for conf/spark-defaults.conf.
--driver-memory MEM Memory for driver (e.g. 1000M, 2G) (Default: 512M).
--driver-java-options Extra Java options to pass to the driver.
--driver-library-path Extra library path entries to pass to the driver.
--driver-class-path Extra class path entries to pass to the driver. Note that
jars added with --jars are automatically included in the
classpath.
--executor-memory MEM Memory per executor (e.g. 1000M, 2G) (Default: 1G).
--help, -h Show this help message and exit
--verbose, -v Print additional debug output
Spark standalone with cluster deploy mode only:
--driver-cores NUM Cores for driver (Default: 1).
--supervise If given, restarts the driver on failure.
Spark standalone and Mesos only:
--total-executor-cores NUM Total cores for all executors.
YARN-only:
--executor-cores NUM Number of cores per executor (Default: 1).
--queue QUEUE_NAME The YARN queue to submit to (Default: "default").
--num-executors NUM Number of executors to launch (Default: 2).
--archives ARCHIVES Comma separated list of archives to be extracted into the
working directory of each executor.
CLI options:
-d,--define <key=value> Variable subsitution to apply to hive
commands. e.g. -d A=B or --define A=B
--database <databasename> Specify the database to use
-e <quoted-query-string> SQL from command line
-f <filename> SQL from files
-h <hostname> connecting to Hive Server on remote host
--hiveconf <property=value> Use value for given property
--hivevar <key=value> Variable subsitution to apply to hive
commands. e.g. --hivevar A=B
-i <filename> Initialization SQL file
-p <port> connecting to Hive Server on port number
-S,--silent Silent mode in interactive shell
-v,--verbose Verbose mode (echo executed SQL to the console)
在啟動spark-sql時，如果不指定master，則以local的方式運行，master既可以指定standalone的地址，也可以指定yarn；
當設定master為yarn時(spark-sql --master yarn)時，可以通過http://hadoop000:8088頁面監控到整個job的執行過程；
注：如果在$SPARK_HOME/conf/spark-defaults.conf中配置了spark.master spark://hadoop000:7077，那麼在啟動spark-sql時不指定master也是運行在standalone集群之上。
spark-sql使用
啟動spark-sql： 由於我已經在spark-defaults.conf中配置了spark.master spark://hadoop000:7077，就沒在spark-sql啟動時指定master了
cd $SPARK_HOME/bin
spark-sql
SELECT track_time, url, session_id, referer, ip, end_user_id, city_id FROM page_views WHERE city_id = -1000 limit 10;
SELECT session_id, count(*) c FROM page_views group by session_id order by c desc limit 10;
上面兩個sql語句用到的表現在存在hive中了，如果沒有則手工創建下，創建腳本以及導入數據腳本如下：
create table page_views(
track_time string,
url string,
session_id string,
referer string,
ip string,
end_user_id string,
city_id string
)
ROW FORMAT DELIMITED FIELDS TERMINATED BY '\t';
load data local inpath '/home/spark/software/data/page_views.dat' overwrite into table page_views;
