Frequency at which timer task runs to purge expired events in metastore(in seconds). If the bucketing/sorting properties of the table exactly match the grouping key, whether to perform the group by in the mapper by using BucketizedHiveInputFormat. The only downside to this. RCFile default SerDe (ColumnarSerDe) serializes the values in such a way that the datatypes can be converted from string to any type. Setting this to true is useful when the operator statistics used for a common join → map join conversion are inaccurate. /user/hive/warehouse is the default directory location set in hive.metastore.warehouse.dir property where all database and table directories are made. What strategy ORC should use to create splits for execution. A Java regex. This is used to construct a list of exception handlers to handle exceptions thrown by record readers. This flag should be set to true to enable the new vectorization of queries using ReduceSink. This configuration property enables the user to provide a comma-separated list of URLs which provide the type and location of Hadoop credential providers. For hive.service.metrics.class org.apache.hadoop.hive.common.metrics.metrics2.CodahaleMetrics and hive.service.metrics.reporter HADOOP2, this is the frequency of updating the HADOOP2 metrics system. The default value is true. Whether to provide the row offset virtual column. this value will be used. Kryo is the default (and starting from Hive 2.0.0 Kryo is the only supported value). The number means after how many rows processed it needs to check the memory usage. When Configuration Properties#hive.exec.mode.local.auto is true, the number of tasks should be less than this for local mode. Set this to true for using SSL encryption in HiveServer2. Prior to 0.14, on partitioned table, analyze statement used to collect table level statistics when no partition is specified. Used when property Configuration Properties#hive.server2.authentication is set to 'CUSTOM'. List of the underlying PAM services that should be used when Configuration Properties#hive.server2.authentication type is PAM. This property can also be used to find the users if a custom-configured LDAP query returns a group instead of a user (as of Hive 2.1.1). These jars can be used just like the auxiliary classes in hive.aux.jars.path for creating UDFs or SerDes. Options are TextFile, SequenceFile, RCfile, ORC, and Parquet. Click the Properties tab. If the value is 0, statistics are not used and Configuration Properties#hive.hashtable.initialCapacity is used instead. This can be used to restrict the set of authorized commands. Typically set to a prime close to the number of available hosts. Options are TextFile, SequenceFile, and RCfile. The JOIN operator uses column statistics to estimate the number of rows flowing out of it and hence the data size. This support was added by MAPREDUCE-1501. Maximum number of transactions that can be fetched in one call to open_txns(). For WebHCat configuration, see Configuration Variables in the WebHCat manual. If Configuration Properties#hive.enforce.bucketing or Configuration Properties#hive.enforce.sorting is true, don't create a reducer for enforcing bucketing/sorting for queries of the form: insert overwrite table T2 select * from T1; where T1 and T2 are bucketed/sorted by the same keys into the same number of buckets. Keepalive time (in seconds) for an idle worker thread. Some select queries can be converted to a single FETCH task, minimizing latency. We can enable optimization of skew joins, i.e. In that case, if the available size within the block is more than 3.2Mb, a new smaller stripe will be inserted to fit within that space. Replaced in Hive 0.9.0 by Configuration Properties#hive.exec.mode.local.auto.input.files.max. This line may already be correct in mapred-site.xml. This is replaces hive.exec.scratchdir for query results with the exception of read-only tables. Updating the conf property via set hive.cli.print.current.db=true will show the current DB for current hive session only, but if we update the .hiverc file with the above property will keep showing the current db for all the sessions. Set to a negative number to disable. Enforce that all parents are in llap, before considering vertex, Enforce that inputs are vectorized, before considering vertex. Port number of HiveServer2 Thrift interface. Define the default ORC stripe size, in bytes. Duration after which events expire from events table (in seconds). 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). Only works when Configuration Properties#hive.server2.webui.show.graph and Configuration Properties#hive.server2.webui.explain.output set to true. when this map join is followed by a group by. Added in: Hive 3.0.0 with HIVE-17318 and HIVE-17319. In strict mode, some risky queries are not allowed to run. Storage formats that currently do not specify a SerDe include 'TextFile, RcFile'. For information about how to use these configuration properties, see Configuring Hive. Create a free website or blog at WordPress.com. For a complete list of parameters required for turning on transactions, see Configuration Properties#hive.txn.manager. If the application needs accurate statistics, they can then be obtained in the background. Apache Tez replaces MapReduce as the default Hive execution engine. This can be used to overwrite the default. Depending on how many values in the table the join will actually touch, it can save a lot of memory by not creating objects for rows that are not needed. Hive 0.13.0 introduces fine-grained authorization based on the SQL standard authorization model. By default Tez will spawn containers of the size of a mapper. (Stride is the number of rows an index entry represents.). Decreasing this value will shorten the time it takes to clean up old, no longer used versions of the data and increase the load on the metastore server. This improves metastore performance for integral columns, especially if there's a large number of partitions. This limits the number of partitions that can be requested from the Metastore for a given table. Whether or not to enable automatic rebuilding of indexes when they go stale.Caution: Rebuilding indexes can be a lengthy and computationally expensive operation; in many cases it may be best to rebuild indexes manually. By default all values in the HiveConf object are converted to environment variables of the same name as the key (with '.' This is for Hadoop 2 only. An example like "select,drop" will grant select and drop privilege to the owner of the table. When enabled, will log EXPLAIN output for the query at user level. Avoids the overhead of spawning new JVMs, but can lead to out-of-memory issues. If the one specified in the configuration property Configuration Properties#mapred.reduce.tasks is negative, Hive will use this as the maximum number of reducers when automatically determining the number of reducers. The user could potentially want to run queries over Tez without the pool of sessions. A COLON-separated list of string patterns to represent the base DNs for LDAP Users. This is for Hadoop 2 only. "org.apache.hadoop.hive.common.metrics.metrics2.CodahaleMetrics" is the new implementation. (2 * pool_size * metastore_instances + 2 * pool_size * HS2_instances_with_embedded_metastore) = (2 * physical_core_count + hard_disk_count). Whether to enable Log4j2's asynchronous logging. And then, a union is performed for the two joins generated above. Note: Turn on Configuration Properties#hive.optimize.index.filter as well to use file format specific indexes with PPD. OK In the process of Mapjoin, the key/value will be held in the hashtable. At compile time, the plan is broken into different joins: one for the skewed keys, and the other for the remaining keys. Ideally 'hivemetastore' for the MetaStore and 'hiveserver2' for HiveServer2. Only works on Configuration Properties#Tez and Configuration Properties#Spark, because memory-optimized hash table cannot be serialized.
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