hivesterix/hivesterix-dist/conf/hive-default.xml

<?xml version="1.0"?>
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 ! Copyright 2009-2013 by The Regents of the University of California
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<?xml-stylesheet type="text/xsl" href="configuration.xsl"?>

<configuration>

	<!-- Hive Configuration can either be stored in this file or in the hadoop 
		configuration files -->
	<!-- that are implied by Hadoop setup variables. -->
	<!-- Aside from Hadoop setup variables - this file is provided as a convenience 
		so that Hive -->
	<!-- users do not have to edit hadoop configuration files (that may be managed 
		as a centralized -->
	<!-- resource). -->

	<!-- Hive Execution Parameters -->
	<property>
		<name>mapred.reduce.tasks</name>
		<value>-1</value>
		<description>The default number of reduce tasks per job. Typically set
			to a prime close to the number of available hosts. Ignored when
			mapred.job.tracker is "local". Hadoop set this to 1 by default,
			whereas hive uses -1 as its default value.
			By setting this property to -1, Hive will automatically figure out what
			should be the number of reducers.
  </description>

        <property>
		<name>hive.hyracks.connectorpolicy</name>
		<value>PIPELINING</value>
        </property>

	<property>
		<name>hive.hyracks.parrallelism</name>
		<value>4</value>
	</property>

	<property>
		<name>hive.algebricks.groupby.external</name>
		<value>true</value>
	</property>
	
	<property>
		<name>hive.algebricks.groupby.external.memory</name>
		<value>33554432</value>
	</property>
	
	<property>
		<name>hive.algebricks.sort.memory</name>
		<value>33554432</value>
	</property>

	<property>
		<name>hive.exec.reducers.bytes.per.reducer</name>
		<value>1000000000</value>
		<description>size per reducer.The default is 1G, i.e if the input size
			is 10G, it will use 10 reducers.</description>
	</property>

	<property>
		<name>hive.exec.reducers.max</name>
		<value>999</value>
		<description>max number of reducers will be used. If the one
			specified in the configuration parameter mapred.reduce.tasks is
			negative, hive will use this one as the max number of reducers when
			automatically determine number of reducers.</description>
	</property>

	<property>
		<name>hive.exec.scratchdir</name>
		<value>/hive-${user.name}</value>
		<description>Scratch space for Hive jobs</description>
	</property>

	<property>
		<name>hive.test.mode</name>
		<value>false</value>
		<description>whether hive is running in test mode. If yes, it turns on
			sampling and prefixes the output tablename</description>
	</property>

	<property>
		<name>hive.test.mode.prefix</name>
		<value>test_</value>
		<description>if hive is running in test mode, prefixes the output
			table by this string</description>
	</property>

	<!-- If the input table is not bucketed, the denominator of the tablesample 
		is determinied by the parameter below -->
	<!-- For example, the following query: -->
	<!-- INSERT OVERWRITE TABLE dest -->
	<!-- SELECT col1 from src -->
	<!-- would be converted to -->
	<!-- INSERT OVERWRITE TABLE test_dest -->
	<!-- SELECT col1 from src TABLESAMPLE (BUCKET 1 out of 32 on rand(1)) -->
	<property>
		<name>hive.test.mode.samplefreq</name>
		<value>32</value>
		<description>if hive is running in test mode and table is not
			bucketed, sampling frequency</description>
	</property>

	<property>
		<name>hive.test.mode.nosamplelist</name>
		<value></value>
		<description>if hive is running in test mode, dont sample the above
			comma seperated list of tables</description>
	</property>

	<property>
		<name>hive.metastore.local</name>
		<value>true</value>
		<description>controls whether to connect to remove metastore server or
			open a new metastore server in Hive Client JVM</description>
	</property>

	<property>
		<name>javax.jdo.option.ConnectionURL</name>
		<value>jdbc:derby:;databaseName=metastore_db;create=true</value>
		<description>JDBC connect string for a JDBC metastore</description>
	</property>

	<property>
		<name>javax.jdo.option.ConnectionDriverName</name>
		<value>org.apache.derby.jdbc.EmbeddedDriver</value>
		<description>Driver class name for a JDBC metastore</description>
	</property>

	<property>
		<name>javax.jdo.PersistenceManagerFactoryClass</name>
		<value>org.datanucleus.jdo.JDOPersistenceManagerFactory</value>
		<description>class implementing the jdo persistence</description>
	</property>

	<property>
		<name>datanucleus.connectionPoolingType</name>
		<value>DBCP</value>
		<description>Uses a DBCP connection pool for JDBC metastore
		</description>
	</property>

	<property>
		<name>javax.jdo.option.DetachAllOnCommit</name>
		<value>true</value>
		<description>detaches all objects from session so that they can be
			used after transaction is committed</description>
	</property>

	<property>
		<name>javax.jdo.option.NonTransactionalRead</name>
		<value>true</value>
		<description>reads outside of transactions</description>
	</property>

	<property>
		<name>javax.jdo.option.ConnectionUserName</name>
		<value>APP</value>
		<description>username to use against metastore database</description>
	</property>

	<property>
		<name>javax.jdo.option.ConnectionPassword</name>
		<value>mine</value>
		<description>password to use against metastore database</description>
	</property>

	<property>
		<name>datanucleus.validateTables</name>
		<value>false</value>
		<description>validates existing schema against code. turn this on if
			you want to verify existing schema </description>
	</property>

	<property>
		<name>datanucleus.validateColumns</name>
		<value>false</value>
		<description>validates existing schema against code. turn this on if
			you want to verify existing schema </description>
	</property>

	<property>
		<name>datanucleus.validateConstraints</name>
		<value>false</value>
		<description>validates existing schema against code. turn this on if
			you want to verify existing schema </description>
	</property>

	<property>
		<name>datanucleus.storeManagerType</name>
		<value>rdbms</value>
		<description>metadata store type</description>
	</property>

	<property>
		<name>datanucleus.autoCreateSchema</name>
		<value>true</value>
		<description>creates necessary schema on a startup if one doesn't
			exist. set this to false, after creating it once</description>
	</property>

	<property>
		<name>datanucleus.autoStartMechanismMode</name>
		<value>checked</value>
		<description>throw exception if metadata tables are incorrect
		</description>
	</property>

	<property>
		<name>datanucleus.transactionIsolation</name>
		<value>read-committed</value>
		<description>Default transaction isolation level for identity
			generation. </description>
	</property>

	<property>
		<name>datanucleus.cache.level2</name>
		<value>false</value>
		<description>Use a level 2 cache. Turn this off if metadata is changed
			independently of hive metastore server</description>
	</property>

	<property>
		<name>datanucleus.cache.level2.type</name>
		<value>SOFT</value>
		<description>SOFT=soft reference based cache, WEAK=weak reference
			based cache.</description>
	</property>

	<property>
		<name>datanucleus.identifierFactory</name>
		<value>datanucleus</value>
		<description>Name of the identifier factory to use when generating
			table/column names etc. 'datanucleus' is used for backward
			compatibility</description>
	</property>

	<property>
		<name>hive.metastore.warehouse.dir</name>
		<value>/user/hivesterix</value>
		<description>location of default database for the warehouse
		</description>
	</property>

	<property>
		<name>hive.metastore.connect.retries</name>
		<value>5</value>
		<description>Number of retries while opening a connection to metastore
		</description>
	</property>

	<property>
		<name>hive.metastore.rawstore.impl</name>
		<value>org.apache.hadoop.hive.metastore.ObjectStore</value>
		<description>Name of the class that implements
			org.apache.hadoop.hive.metastore.rawstore interface. This class is
			used to store and retrieval of raw metadata objects such as table,
			database</description>
	</property>

	<property>
		<name>hive.default.fileformat</name>
		<value>TextFile</value>
		<description>Default file format for CREATE TABLE statement. Options
			are TextFile and SequenceFile. Users can explicitly say CREATE TABLE
			... STORED AS &lt;TEXTFILE|SEQUENCEFILE&gt; to override</description>
	</property>

	<property>
		<name>hive.fileformat.check</name>
		<value>true</value>
		<description>Whether to check file format or not when loading data
			files</description>
	</property>

	<property>
		<name>hive.map.aggr</name>
		<value>true</value>
		<description>Whether to use map-side aggregation in Hive Group By
			queries</description>
	</property>

	<property>
		<name>hive.groupby.skewindata</name>
		<value>false</value>
		<description>Whether there is skew in data to optimize group by
			queries</description>
	</property>

	<property>
		<name>hive.groupby.mapaggr.checkinterval</name>
		<value>100000</value>
		<description>Number of rows after which size of the grouping
			keys/aggregation classes is performed</description>
	</property>

	<property>
		<name>hive.mapred.local.mem</name>
		<value>0</value>
		<description>For local mode, memory of the mappers/reducers
		</description>
	</property>

	<property>
		<name>hive.map.aggr.hash.percentmemory</name>
		<value>0.5</value>
		<description>Portion of total memory to be used by map-side grup
			aggregation hash table</description>
	</property>

	<property>
		<name>hive.map.aggr.hash.min.reduction</name>
		<value>0.5</value>
		<description>Hash aggregation will be turned off if the ratio between
			hash
			table size and input rows is bigger than this number. Set to 1 to make
			sure
			hash aggregation is never turned off.</description>
	</property>

	<property>
		<name>hive.optimize.cp</name>
		<value>true</value>
		<description>Whether to enable column pruner</description>
	</property>

	<property>
		<name>hive.optimize.ppd</name>
		<value>true</value>
		<description>Whether to enable predicate pushdown</description>
	</property>

	<property>
		<name>hive.optimize.pruner</name>
		<value>true</value>
		<description>Whether to enable the new partition pruner which depends
			on predicate pushdown. If this is disabled,
			the old partition pruner which is based on AST will be enabled.
		</description>
	</property>

	<property>
		<name>hive.optimize.groupby</name>
		<value>true</value>
		<description>Whether to enable the bucketed group by from bucketed
			partitions/tables.</description>
	</property>

	<property>
		<name>hive.join.emit.interval</name>
		<value>1000</value>
		<description>How many rows in the right-most join operand Hive should
			buffer before emitting the join result. </description>
	</property>

	<property>
		<name>hive.join.cache.size</name>
		<value>25000</value>
		<description>How many rows in the joining tables (except the streaming
			table) should be cached in memory. </description>
	</property>

	<property>
		<name>hive.mapjoin.bucket.cache.size</name>
		<value>100</value>
		<description>How many values in each keys in the map-joined table
			should be cached in memory. </description>
	</property>

	<property>
		<name>hive.mapjoin.maxsize</name>
		<value>100000</value>
		<description>Maximum # of rows of the small table that can be handled
			by map-side join. If the size is reached and hive.task.progress is
			set, a fatal error counter is set and the job will be killed.
		</description>
	</property>

	<property>
		<name>hive.mapjoin.cache.numrows</name>
		<value>25000</value>
		<description>How many rows should be cached by jdbm for map join.
		</description>
	</property>

	<property>
		<name>hive.optimize.skewjoin</name>
		<value>false</value>
		<description>Whether to enable skew join optimization. </description>
	</property>

	<property>
		<name>hive.skewjoin.key</name>
		<value>100000</value>
		<description>Determine if we get a skew key in join. If we see more
			than the specified number of rows with the same key in join operator,
			we think the key as a skew join key. </description>
	</property>

	<property>
		<name>hive.skewjoin.mapjoin.map.tasks</name>
		<value>10000</value>
		<description> Determine the number of map task used in the follow up
			map join job
			for a skew join. It should be used together with
			hive.skewjoin.mapjoin.min.split
			to perform a fine grained control.</description>
	</property>

	<property>
		<name>hive.skewjoin.mapjoin.min.split</name>
		<value>33554432</value>
		<description> Determine the number of map task at most used in the
			follow up map join job
			for a skew join by specifying the minimum split size. It should be used
			together with
			hive.skewjoin.mapjoin.map.tasks to perform a fine grained control.</description>
	</property>

	<property>
		<name>hive.mapred.mode</name>
		<value>nonstrict</value>
		<description>The mode in which the hive operations are being
			performed. In strict mode, some risky queries are not allowed to run
		</description>
	</property>

	<property>
		<name>hive.exec.script.maxerrsize</name>
		<value>100000</value>
		<description>Maximum number of bytes a script is allowed to emit to
			standard error (per map-reduce task). This prevents runaway scripts
			from filling logs partitions to capacity </description>
	</property>

	<property>
		<name>hive.exec.script.allow.partial.consumption</name>
		<value>false</value>
		<description> When enabled, this option allows a user script to exit
			successfully without consuming all the data from the standard input.
		</description>
	</property>

	<property>
		<name>hive.script.operator.id.env.var</name>
		<value>HIVE_SCRIPT_OPERATOR_ID</value>
		<description> Name of the environment variable that holds the unique
			script operator ID in the user's transform function (the custom
			mapper/reducer that the user has specified in the query)
		</description>
	</property>

	<property>
		<name>hive.exec.compress.output</name>
		<value>false</value>
		<description> This controls whether the final outputs of a query (to a
			local/hdfs file or a hive table) is compressed. The compression codec
			and other options are determined from hadoop config variables
			mapred.output.compress* </description>
	</property>

	<property>
		<name>hive.exec.compress.intermediate</name>
		<value>false</value>
		<description> This controls whether intermediate files produced by
			hive between multiple map-reduce jobs are compressed. The compression
			codec and other options are determined from hadoop config variables
			mapred.output.compress* </description>
	</property>

	<property>
		<name>hive.exec.parallel</name>
		<value>false</value>
		<description>Whether to execute jobs in parallel</description>
	</property>

	<property>
		<name>hive.exec.parallel.thread.number</name>
		<value>8</value>
		<description>How many jobs at most can be executed in parallel
		</description>
	</property>

	<property>
		<name>hive.hwi.war.file</name>
		<value>lib\hive-hwi-0.7.0.war</value>
		<description>This sets the path to the HWI war file, relative to
			${HIVE_HOME}. </description>
	</property>

	<property>
		<name>hive.hwi.listen.host</name>
		<value>0.0.0.0</value>
		<description>This is the host address the Hive Web Interface will
			listen on</description>
	</property>

	<property>
		<name>hive.hwi.listen.port</name>
		<value>9999</value>
		<description>This is the port the Hive Web Interface will listen on
		</description>
	</property>

	<property>
		<name>hive.exec.pre.hooks</name>
		<value></value>
		<description>Pre Execute Hook for Tests</description>
	</property>

	<property>
		<name>hive.merge.mapfiles</name>
		<value>true</value>
		<description>Merge small files at the end of a map-only job
		</description>
	</property>

	<property>
		<name>hive.merge.mapredfiles</name>
		<value>false</value>
		<description>Merge small files at the end of a map-reduce job
		</description>
	</property>

	<property>
		<name>hive.heartbeat.interval</name>
		<value>1000</value>
		<description>Send a heartbeat after this interval - used by mapjoin
			and filter operators</description>
	</property>

	<property>
		<name>hive.merge.size.per.task</name>
		<value>256000000</value>
		<description>Size of merged files at the end of the job</description>
	</property>

	<property>
		<name>hive.merge.size.smallfiles.avgsize</name>
		<value>16000000</value>
		<description>When the average output file size of a job is less than
			this number, Hive will start an additional map-reduce job to merge
			the output files into bigger files. This is only done for map-only
			jobs if hive.merge.mapfiles is true, and for map-reduce jobs if
			hive.merge.mapredfiles is true.</description>
	</property>

	<property>
		<name>hive.script.auto.progress</name>
		<value>false</value>
		<description>Whether Hive Tranform/Map/Reduce Clause should
			automatically send progress information to TaskTracker to avoid the
			task getting killed because of inactivity. Hive sends progress
			information when the script is outputting to stderr. This option
			removes the need of periodically producing stderr messages, but users
			should be cautious because this may prevent infinite loops in the
			scripts to be killed by TaskTracker.  </description>
	</property>

	<property>
		<name>hive.script.serde</name>
		<value>org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe</value>
		<description>The default serde for trasmitting input data to and
			reading output data from the user scripts. </description>
	</property>

	<property>
		<name>hive.script.recordreader</name>
		<value>org.apache.hadoop.hive.ql.exec.TextRecordReader</value>
		<description>The default record reader for reading data from the user
			scripts. </description>
	</property>

	<property>
		<name>hive.script.recordwriter</name>
		<value>org.apache.hadoop.hive.ql.exec.TextRecordWriter</value>
		<description>The default record writer for writing data to the user
			scripts. </description>
	</property>

	<property>
		<name>hive.input.format</name>
		<value>org.apache.hadoop.hive.ql.io.HiveInputFormat</value>
		<description>The default input format, if it is not specified, the
			system assigns it. It is set to HiveInputFormat for hadoop versions
			17, 18 and 19, whereas it is set to CombinedHiveInputFormat for
			hadoop 20. The user can always overwrite it - if there is a bug in
			CombinedHiveInputFormat, it can always be manually set to
			HiveInputFormat. </description>
	</property>

	<property>
		<name>hive.udtf.auto.progress</name>
		<value>false</value>
		<description>Whether Hive should automatically send progress
			information to TaskTracker when using UDTF's to prevent the task
			getting killed because of inactivity. Users should be cautious
			because this may prevent TaskTracker from killing tasks with infinte
			loops.  </description>
	</property>

	<property>
		<name>hive.mapred.reduce.tasks.speculative.execution</name>
		<value>true</value>
		<description>Whether speculative execution for reducers should be
			turned on. </description>
	</property>

	<property>
		<name>hive.exec.counters.pull.interval</name>
		<value>1000</value>
		<description>The interval with which to poll the JobTracker for the
			counters the running job. The smaller it is the more load there will
			be on the jobtracker, the higher it is the less granular the caught
			will be.</description>
	</property>

	<property>
		<name>hive.enforce.bucketing</name>
		<value>false</value>
		<description>Whether bucketing is enforced. If true, while inserting
			into the table, bucketing is enforced. </description>
	</property>

	<property>
		<name>hive.enforce.sorting</name>
		<value>false</value>
		<description>Whether sorting is enforced. If true, while inserting
			into the table, sorting is enforced. </description>
	</property>

	<property>
		<name>hive.metastore.ds.connection.url.hook</name>
		<value></value>
		<description>Name of the hook to use for retriving the JDO connection
			URL. If empty, the value in javax.jdo.option.ConnectionURL is used
		</description>
	</property>

	<property>
		<name>hive.metastore.ds.retry.attempts</name>
		<value>1</value>
		<description>The number of times to retry a metastore call if there
			were a connection error</description>
	</property>

	<property>
		<name>hive.metastore.ds.retry.interval</name>
		<value>1000</value>
		<description>The number of miliseconds between metastore retry
			attempts</description>
	</property>

	<property>
		<name>hive.metastore.server.min.threads</name>
		<value>200</value>
		<description>Minimum number of worker threads in the Thrift server's
			pool.</description>
	</property>

	<property>
		<name>hive.metastore.server.max.threads</name>
		<value>100000</value>
		<description>Maximum number of worker threads in the Thrift server's
			pool.</description>
	</property>

	<property>
		<name>hive.metastore.server.tcp.keepalive</name>
		<value>true</value>
		<description>Whether to enable TCP keepalive for the metastore server.
			Keepalive will prevent accumulation of half-open connections.
		</description>
	</property>

	<property>
		<name>hive.optimize.reducededuplication</name>
		<value>true</value>
		<description>Remove extra map-reduce jobs if the data is already
			clustered by the same key which needs to be used again. This should
			always be set to true. Since it is a new feature, it has been made
			configurable.</description>
	</property>

	<property>
		<name>hive.exec.dynamic.partition</name>
		<value>false</value>
		<description>Whether or not to allow dynamic partitions in DML/DDL.
		</description>
	</property>

	<property>
		<name>hive.exec.dynamic.partition.mode</name>
		<value>strict</value>
		<description>In strict mode, the user must specify at least one static
			partition in case the user accidentally overwrites all partitions.
		</description>
	</property>

	<property>
		<name>hive.exec.max.dynamic.partitions</name>
		<value>1000</value>
		<description>Maximum number of dynamic partitions allowed to be
			created in total.</description>
	</property>

	<property>
		<name>hive.exec.max.dynamic.partitions.pernode</name>
		<value>100</value>
		<description>Maximum number of dynamic partitions allowed to be
			created in each mapper/reducer node.</description>
	</property>

	<property>
		<name>hive.default.partition.name</name>
		<value>__HIVE_DEFAULT_PARTITION__</value>
		<description>The default partition name in case the dynamic partition
			column value is null/empty string or anyother values that cannot be
			escaped. This value must not contain any special character used in
			HDFS URI (e.g., ':', '%', '/' etc). The user has to be aware that the
			dynamic partition value should not contain this value to avoid
			confusions.</description>
	</property>

	<property>
		<name>fs.har.impl</name>
		<value>org.apache.hadoop.hive.shims.HiveHarFileSystem</value>
		<description>The implementation for accessing Hadoop Archives. Note
			that this won't be applicable to Hadoop vers less than 0.20
		</description>
	</property>

	<property>
		<name>hive.archive.enabled</name>
		<value>false</value>
		<description>Whether archiving operations are permitted</description>
	</property>

	<property>
		<name>hive.archive.har.parentdir.settable</name>
		<value>false</value>
		<description>In new Hadoop versions, the parent directory must be set
			while
			creating a HAR. Because this functionality is hard to detect with just
			version
			numbers, this conf var needs to be set manually.</description>
	</property>

	<!-- HBase Storage Handler Parameters -->

	<property>
		<name>hive.hbase.wal.enabled</name>
		<value>true</value>
		<description>Whether writes to HBase should be forced to the
			write-ahead log. Disabling this improves HBase write performance at
			the risk of lost writes in case of a crash.</description>
	</property>

</configuration>