hive.exec.scratchdir /tmp/scratch HDFS root scratch dir for Hive jobs which gets created with write all (733) permission. For each connecting user, an HDFS scratch dir: ${hive.exec.scratchdir}/<username> is created, with ${hive.scratch.dir.permission}. hive.exec.submitviachild false hive.exec.submit.local.task.via.child true Determines whether local tasks (typically mapjoin hashtable generation phase) runs in separate JVM (true recommended) or not. Avoids the overhead of spawning new JVM, but can lead to out-of-memory issues. hive.exec.compress.output false 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* hive.intermediate.compression.codec hive.exec.reducers.max 1009 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. hive.exec.pre.hooks org.apache.hadoop.hive.ql.hooks.HiveProtoLoggingHook Comma-separated list of pre-execution hooks to be invoked for each statement. A pre-execution hook is specified as the name of a Java class which implements the org.apache.hadoop.hive.ql.hooks.ExecuteWithHookContext interface. hive.exec.post.hooks org.apache.hadoop.hive.ql.hooks.HiveProtoLoggingHook Comma-separated list of post-execution hooks to be invoked for each statement. A post-execution hook is specified as the name of a Java class which implements the org.apache.hadoop.hive.ql.hooks.ExecuteWithHookContext interface. hive.exec.failure.hooks org.apache.hadoop.hive.ql.hooks.HiveProtoLoggingHook Comma-separated list of on-failure hooks to be invoked for each statement. An on-failure hook is specified as the name of Java class which implements the org.apache.hadoop.hive.ql.hooks.ExecuteWithHookContext interface. hive.exec.parallel false Whether to execute jobs in parallel hive.exec.parallel.thread.number 8 How many jobs at most can be executed in parallel hive.mapred.reduce.tasks.speculative.execution false Whether speculative execution for reducers should be turned on. hive.exec.dynamic.partition true Whether or not to allow dynamic partitions in DML/DDL. hive.exec.max.dynamic.partitions 5000 Maximum number of dynamic partitions allowed to be created in total. hive.exec.max.dynamic.partitions.pernode 2000 Maximum number of dynamic partitions allowed to be created in each mapper/reducer node. hive.exec.max.created.files 100000L Maximum number of HDFS files created by all mappers/reducers in a MapReduce job. hive.metastore.warehouse.dir /apps/hive/warehouse location of default database for the warehouse hive.metastore.failure.retries 5 Number of retries upon failure of Thrift metastore calls hive.metastore.client.connect.retry.delay 5s Expects a time value with unit (d/day, h/hour, m/min, s/sec, ms/msec, us/usec, ns/nsec), which is sec if not specified. Number of seconds for the client to wait between consecutive connection attempts hive.metastore.client.socket.timeout 1800s Expects a time value with unit (d/day, h/hour, m/min, s/sec, ms/msec, us/usec, ns/nsec), which is sec if not specified. MetaStore Client socket timeout in seconds javax.jdo.option.ConnectionPassword password to use against metastore database javax.jdo.option.ConnectionURL jdbc:mysql://localhost/hive?createDatabaseIfNotExist=true JDBC connect string for a JDBC metastore hive.metastore.server.max.threads 100000 Maximum number of worker threads in the Thrift server's pool. hive.metastore.kerberos.keytab.file /etc/security/keytabs/hive.service.keytab The path to the Kerberos Keytab file containing the metastore Thrift server's service principal. hive.metastore.kerberos.principal hive/_HOST@EXAMPLE.COM The service principal for the metastore Thrift server. The special string _HOST will be replaced automatically with the correct host name. hive.cluster.delegation.token.store.class org.apache.hadoop.hive.thrift.ZooKeeperTokenStore The delegation token store implementation. Set to org.apache.hadoop.hive.thrift.ZooKeeperTokenStore for load-balanced cluster. hive.cluster.delegation.token.store.zookeeper.znode /hive/cluster/delegation The root path for token store data. hive.metastore.cache.pinobjtypes Table,Database,Type,FieldSchema,Order List of comma separated metastore object types that should be pinned in the cache hive.metastore.pre.event.listeners org.apache.hadoop.hive.ql.security.authorization.AuthorizationPreEventListener List of comma separated listeners for metastore events. hive.metastore.authorization.storage.checks false Should the metastore do authorization checks against the underlying storage (usually hdfs) for operations like drop-partition (disallow the drop-partition if the user in question doesn't have permissions to delete the corresponding directory on the storage). javax.jdo.option.ConnectionDriverName com.mysql.jdbc.Driver Driver class name for a JDBC metastore javax.jdo.option.ConnectionUserName hive Username to use against metastore database hive.aux.jars.path hive.reloadable.aux.jars.path Jars can be renewed by executing reload command. And these jars can be used as the auxiliary classes like creating a UDF or SerDe. hive.map.aggr true Whether to use map-side aggregation in Hive Group By queries hive.cbo.enable true Flag to control enabling Cost Based Optimizations using Calcite framework. hive.mapjoin.bucket.cache.size 10000 hive.mapjoin.optimized.hashtable true Whether Hive should use memory-optimized hash table for MapJoin. Only works on Tez, because memory-optimized hashtable cannot be serialized. hive.smbjoin.cache.rows 10000 How many rows with the same key value should be cached in memory per smb joined table. hive.map.aggr.hash.percentmemory 0.5 Portion of total memory to be used by map-side group aggregation hash table hive.map.aggr.hash.force.flush.memory.threshold 0.9 The max memory to be used by map-side group aggregation hash table. If the memory usage is higher than this number, force to flush data hive.map.aggr.hash.min.reduction 0.5 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. hive.merge.mapfiles true Merge small files at the end of a map-only job hive.merge.mapredfiles false Merge small files at the end of a map-reduce job hive.merge.tezfiles false Merge small files at the end of a Tez DAG hive.merge.size.per.task 256000000 Size of merged files at the end of the job hive.merge.smallfiles.avgsize 16000000 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. hive.merge.rcfile.block.level true hive.merge.orcfile.stripe.level true When hive.merge.mapfiles or hive.merge.mapredfiles is enabled while writing a table with ORC file format, enabling this config will do stripe level fast merge for small ORC files. Note that enabling this config will not honor padding tolerance config (hive.exec.orc.block.padding.tolerance). hive.exec.orc.default.stripe.size 67108864 Define the default ORC stripe size hive.exec.orc.default.compress ZLIB Define the default compression codec for ORC file hive.exec.orc.compression.strategy SPEED Expects one of [speed, compression]. Define the compression strategy to use while writing data. This changes the compression level of higher level compression codec (like ZLIB). hive.orc.splits.include.file.footer false If turned on splits generated by orc will include metadata about the stripes in the file. This data is read remotely (from the client or HS2 machine) and sent to all the tasks. hive.orc.compute.splits.num.threads 10 How many threads orc should use to create splits in parallel. hive.auto.convert.join true Whether Hive enables the optimization about converting common join into mapjoin based on the input file size hive.auto.convert.join.noconditionaltask true Whether Hive enables the optimization about converting common join into mapjoin based on the input file size. If this parameter is on, and the sum of size for n-1 of the tables/partitions for a n-way join is smaller than the specified size, the join is directly converted to a mapjoin (there is no conditional task). hive.limit.optimize.enable true Whether to enable to optimization to trying a smaller subset of data for simple LIMIT first. hive.tez.container.size 1364 By default Tez will spawn containers of the size of a mapper. This can be used to overwrite. hive.tez.cpu.vcores -1 By default Tez will ask for however many cpus map-reduce is configured to use per container. This can be used to overwrite. hive.tez.java.opts -server -Xms1024m -Xmx1024m -Djava.net.preferIPv4Stack=true -XX:NewRatio=8 -XX:+UseNUMA -XX:+UseParallelGC By default Tez will use the Java options from map tasks. This can be used to overwrite. hive.tez.log.level INFO The log level to use for tasks executing as part of the DAG. Used only if hive.tez.java.opts is used to configure Java options. hive.enforce.bucketing true Whether bucketing is enforced. If true, while inserting into the table, bucketing is enforced. hive.enforce.sorting true Whether sorting is enforced. If true, while inserting into the table, sorting is enforced. hive.enforce.sortmergebucketmapjoin true If the user asked for sort-merge bucketed map-side join, and it cannot be performed, should the query fail or not ? hive.auto.convert.sortmerge.join true Will the join be automatically converted to a sort-merge join, if the joined tables pass the criteria for sort-merge join. hive.auto.convert.sortmerge.join.to.mapjoin false If hive.auto.convert.sortmerge.join is set to true, and a join was converted to a sort-merge join, this parameter decides whether each table should be tried as a big table, and effectively a map-join should be tried. That would create a conditional task with n+1 children for a n-way join (1 child for each table as the big table), and the backup task will be the sort-merge join. In some cases, a map-join would be faster than a sort-merge join, if there is no advantage of having the output bucketed and sorted. For example, if a very big sorted and bucketed table with few files (say 10 files) are being joined with a very small sorter and bucketed table with few files (10 files), the sort-merge join will only use 10 mappers, and a simple map-only join might be faster if the complete small table can fit in memory, and a map-join can be performed. hive.optimize.constant.propagation true Whether to enable constant propagation optimizer hive.optimize.metadataonly true hive.optimize.null.scan true Dont scan relations which are guaranteed to not generate any rows hive.optimize.bucketmapjoin true Whether to try bucket mapjoin hive.optimize.reducededuplication true 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. hive.optimize.reducededuplication.min.reducer 4 Reduce deduplication merges two RSs by moving key/parts/reducer-num of the child RS to parent RS. That means if reducer-num of the child RS is fixed (order by or forced bucketing) and small, it can make very slow, single MR. The optimization will be automatically disabled if number of reducers would be less than specified value. hive.optimize.sort.dynamic.partition false When enabled dynamic partitioning column will be globally sorted. This way we can keep only one record writer open for each partition value in the reducer thereby reducing the memory pressure on reducers. hive.stats.autogather true A flag to gather statistics automatically during the INSERT OVERWRITE command. hive.stats.dbclass fs Expects one of the pattern in [jdbc(:.*), hbase, counter, custom, fs]. The storage that stores temporary Hive statistics. Currently, jdbc, hbase, counter and custom type are supported. hive.stats.fetch.partition.stats true Annotation of operator tree with statistics information requires partition level basic statistics like number of rows, data size and file size. Partition statistics are fetched from metastore. Fetching partition statistics for each needed partition can be expensive when the number of partitions is high. This flag can be used to disable fetching of partition statistics from metastore. When this flag is disabled, Hive will make calls to filesystem to get file sizes and will estimate the number of rows from row schema. hive.stats.fetch.column.stats false Annotation of operator tree with statistics information requires column statistics. Column statistics are fetched from metastore. Fetching column statistics for each needed column can be expensive when the number of columns is high. This flag can be used to disable fetching of column statistics from metastore. hive.zookeeper.quorum List of ZooKeeper servers to talk to. This is needed for: 1. Read/write locks - when hive.lock.manager is set to org.apache.hadoop.hive.ql.lockmgr.zookeeper.ZooKeeperHiveLockManager, 2. When HiveServer2 supports service discovery via Zookeeper. hive.zookeeper.client.port 2181 The port of ZooKeeper servers to talk to. If the list of Zookeeper servers specified in hive.zookeeper.quorum,does not contain port numbers, this value is used. hive.zookeeper.namespace hive_zookeeper_namespace The parent node under which all ZooKeeper nodes are created. hive.txn.max.open.batch 1000 Maximum number of transactions that can be fetched in one call to open_txns(). Increasing this will decrease the number of delta files created when streaming data into Hive. But it will also increase the number of open transactions at any given time, possibly impacting read performance. hive.compactor.worker.timeout 86400L Expects a time value with unit (d/day, h/hour, m/min, s/sec, ms/msec, us/usec, ns/nsec), which is sec if not specified. Time before a given compaction in working state is declared a failure and returned to the initiated state. hive.compactor.check.interval 300L Expects a time value with unit (d/day, h/hour, m/min, s/sec, ms/msec, us/usec, ns/nsec), which is sec if not specified. Time between checks to see if any partitions need compacted. This should be kept high because each check for compaction requires many calls against the NameNode. hive.compactor.delta.pct.threshold 0.1f Percentage (by size) of base that deltas can be before major compaction is initiated. hive.fetch.task.conversion more Expects one of [none, minimal, more]. Some select queries can be converted to single FETCH task minimizing latency. Currently the query should be single sourced not having any subquery and should not have any aggregations or distincts (which incurs RS), lateral views and joins. 0. none : disable hive.fetch.task.conversion 1. minimal : SELECT STAR, FILTER on partition columns, LIMIT only 2. more : SELECT, FILTER, LIMIT only (support TABLESAMPLE and virtual columns) hive.fetch.task.conversion.threshold 1073741824 Input threshold for applying hive.fetch.task.conversion. If target table is native, input length is calculated by summation of file lengths. If it's not native, storage handler for the table can optionally implement org.apache.hadoop.hive.ql.metadata.InputEstimator interface. hive.fetch.task.aggr false Aggregation queries with no group-by clause (for example, select count(*) from src) execute final aggregations in single reduce task. If this is set true, Hive delegates final aggregation stage to fetch task, possibly decreasing the query time. hive.security.authorization.manager org.apache.hadoop.hive.ql.security.authorization.plugin.sqlstd.SQLStdConfOnlyAuthorizerFactory The Hive client authorization manager class name. The user defined authorization class should implement interface org.apache.hadoop.hive.ql.security.authorization.HiveAuthorizationProvider. hive.security.authenticator.manager org.apache.hadoop.hive.ql.security.ProxyUserAuthenticator hive client authenticator manager class name. The user defined authenticator should implement interface org.apache.hadoop.hive.ql.security.HiveAuthenticationProvider. hive.security.metastore.authorization.auth.reads true If this is true, metastore authorizer authorizes read actions on database, table hive.security.metastore.authenticator.manager org.apache.hadoop.hive.ql.security.HadoopDefaultMetastoreAuthenticator authenticator manager class name to be used in the metastore for authentication. The user defined authenticator should implement interface org.apache.hadoop.hive.ql.security.HiveAuthenticationProvider. hive.security.authorization.sqlstd.confwhitelist List of comma separated Java regexes. Configurations parameters that match these regexes can be modified by user when SQL standard authorization is enabled. To get the default value, use the 'set <param>' command. Note that the hive.conf.restricted.list checks are still enforced after the white list check hive.security.authorization.sqlstd.confwhitelist.append List of comma separated Java regexes, to be appended to list set in hive.security.authorization.sqlstd.confwhitelist. Using this list instead of updating the original list means that you can append to the defaults set by SQL standard authorization instead of replacing it entirely. hive.server2.logging.operation.enabled true When true, HS2 will save operation logs hive.server2.logging.operation.log.location ${system:java.io.tmpdir}/${system:user.name}/operation_logs Top level directory where operation logs are stored if logging functionality is enabled hive.server2.support.dynamic.service.discovery true Whether HiveServer2 supports dynamic service discovery for its clients. To support this, each instance of HiveServer2 currently uses ZooKeeper to register itself, when it is brought up. JDBC/ODBC clients should use the ZooKeeper ensemble: hive.zookeeper.quorum in their connection string. hive.server2.zookeeper.namespace hiveserver2 The parent node in ZooKeeper used by HiveServer2 when supporting dynamic service discovery. hive.server2.transport.mode binary Expects one of [binary, http]. Transport mode of HiveServer2. hive.server2.thrift.bind.host Bind host on which to run the HiveServer2 Thrift service. hive.server2.thrift.http.port 10001 Port number of HiveServer2 Thrift interface when hive.server2.transport.mode is 'http'. hive.server2.thrift.http.path cliservice Path component of URL endpoint when in HTTP mode. hive.server2.thrift.port 10000 Port number of HiveServer2 Thrift interface when hive.server2.transport.mode is 'binary'. hive.server2.thrift.sasl.qop auth Expects one of [auth, auth-int, auth-conf]. Sasl QOP value; Set it to one of following values to enable higher levels of protection for HiveServer2 communication with clients. "auth" - authentication only (default) "auth-int" - authentication plus integrity protection "auth-conf" - authentication plus integrity and confidentiality protection This is applicable only if HiveServer2 is configured to use Kerberos authentication. hive.server2.thrift.max.worker.threads 500 Maximum number of Thrift worker threads hive.server2.allow.user.substitution true Allow alternate user to be specified as part of HiveServer2 open connection request. hive.server2.authentication.kerberos.keytab Kerberos keytab file for server principal hive.server2.authentication.kerberos.principal Kerberos server principal hive.server2.authentication.spnego.keytab HTTP/_HOST@EXAMPLE.COM keytab file for SPNego principal, optional, typical value would look like /etc/security/keytabs/spnego.service.keytab, This keytab would be used by HiveServer2 when Kerberos security is enabled and HTTP transport mode is used. This needs to be set only if SPNEGO is to be used in authentication. SPNego authentication would be honored only if valid hive.server2.authentication.spnego.principal and hive.server2.authentication.spnego.keytab are specified. hive.server2.authentication.spnego.principal /etc/security/keytabs/spnego.service.keytab SPNego service principal, optional, typical value would look like HTTP/_HOST@EXAMPLE.COM SPNego service principal would be used by HiveServer2 when Kerberos security is enabled and HTTP transport mode is used. This needs to be set only if SPNEGO is to be used in authentication. hive.server2.authentication.ldap.url LDAP connection URL hive.server2.authentication.ldap.baseDN LDAP base DN hive.server2.authentication.ldap.Domain hive.server2.custom.authentication.class Custom authentication class. Used when property 'hive.server2.authentication' is set to 'CUSTOM'. Provided class must be a proper implementation of the interface org.apache.hive.service.auth.PasswdAuthenticationProvider. HiveServer2 will call its Authenticate(user, passed) method to authenticate requests. The implementation may optionally implement Hadoop's org.apache.hadoop.conf.Configurable class to grab Hive's Configuration object. hive.server2.authentication.pam.services List of the underlying pam services that should be used when auth type is PAM A file with the same name must exist in /etc/pam.d hive.server2.enable.doAs true Setting this property to true will have HiveServer2 execute Hive operations as the user making the calls to it. hive.server2.table.type.mapping CLASSIC Expects one of [classic, hive]. This setting reflects how HiveServer2 will report the table types for JDBC and other client implementations that retrieve the available tables and supported table types HIVE : Exposes Hive's native table types like MANAGED_TABLE, EXTERNAL_TABLE, VIRTUAL_VIEW CLASSIC : More generic types like TABLE and VIEW hive.server2.use.SSL false hive.server2.keystore.path hive.server2.keystore.password hive.conf.restricted.list hive.security.authenticator.manager,hive.security.authorization.manager,hive.users.in.admin.role Comma separated list of configuration options which are immutable at runtime hive.user.install.directory /user/ If hive (in tez mode only) cannot find a usable hive jar in "hive.jar.directory", it will upload the hive jar to "hive.user.install.directory/user.name" and use it to run queries. hive.vectorized.groupby.maxentries 100000 Max number of entries in the vector group by aggregation hashtables. Exceeding this will trigger a flush irrelevant of memory pressure condition. hive.prewarm.enabled false Enables container prewarm for Tez (Hadoop 2 only) hive.prewarm.numcontainers 10 Controls the number of containers to prewarm for Tez (Hadoop 2 only) hive.server2.tez.default.queues default A list of comma separated values corresponding to YARN queues of the same name. When HiveServer2 is launched in Tez mode, this configuration needs to be set for multiple Tez sessions to run in parallel on the cluster. hive.convert.join.bucket.mapjoin.tez false Whether joins can be automatically converted to bucket map joins in hive when tez is used as the execution engine. hive.tez.auto.reducer.parallelism false Turn on Tez' auto reducer parallelism feature. When enabled, Hive will still estimate data sizes and set parallelism estimates. Tez will sample source vertices' output sizes and adjust the estimates at runtime as necessary. hive.tez.max.partition.factor 2.0 When auto reducer parallelism is enabled this factor will be used to over-partition data in shuffle edges. hive.tez.min.partition.factor 0.25 When auto reducer parallelism is enabled this factor will be used to put a lower limit to the number of reducers that tez specifies. hive.tez.dynamic.partition.pruning true When dynamic pruning is enabled, joins on partition keys will be processed by sending events from the processing vertices to the tez application master. These events will be used to prune unnecessary partitions. hive.tez.dynamic.partition.pruning.max.event.size 1048576 Maximum size of events sent by processors in dynamic pruning. If this size is crossed no pruning will take place. hive.tez.dynamic.partition.pruning.max.data.size 104857600 Maximum total data size of events in dynamic pruning. hive.tez.smb.number.waves 0.5 The number of waves in which to run the SMB join. Account for cluster being occupied. Ideally should be 1 wave. hive.heapsize 1024 Hive Java heap size fs.hdfs.impl.disable.cache false true Disable HDFS filesystem cache. fs.file.impl.disable.cache false true Disable local filesystem cache. hive.auto.convert.sortmerge.join.noconditionaltask true Required to Enable the conversion of an SMB (Sort-Merge-Bucket) to a map-join SMB. hive.optimize.mapjoin.mapreduce true If hive.auto.convert.join is off, this parameter does not take affect. If it is on, and if there are map-join jobs followed by a map-reduce job (for e.g a group by), each map-only job is merged with the following map-reduce job. hive.auto.convert.join.noconditionaltask.size 1000000000 If hive.auto.convert.join.noconditionaltask is off, this parameter does not take affect. However, if it is on, and the sum of size for n-1 of the tables/partitions for a n-way join is smaller than this size, the join is directly converted to a mapjoin(there is no conditional task). The default is 10MB hive.vectorized.execution.enabled true This flag should be set to true to enable vectorized mode of query execution. The default value is false. hive.vectorized.execution.reduce.enabled false This flag should be set to true to enable vectorized mode of the reduce-side of query execution. The default value is true. hive.optimize.index.filter true Whether to enable automatic use of indexes hive.execution.engine mr Expects one of [mr, tez]. Chooses execution engine. Options are: mr (Map reduce, default) or tez (hadoop 2 only) hive.vectorized.groupby.checkinterval 4096 Number of entries added to the group by aggregation hash before a recomputation of average entry size is performed. hive.vectorized.groupby.flush.percent 0.1 Percent of entries in the group by aggregation hash flushed when the memory threshold is exceeded. hive.compute.query.using.stats true When set to true Hive will answer a few queries like count(1) purely using stats stored in metastore. For basic stats collection turn on the config hive.stats.autogather to true. For more advanced stats collection need to run analyze table queries. hive.limit.pushdown.memory.usage 0.04 The max memory to be used for hash in RS operator for top K selection. hive.server2.tez.sessions.per.default.queue 1 A positive integer that determines the number of Tez sessions that should be launched on each of the queues specified by "hive.server2.tez.default.queues". Determines the parallelism on each queue. hive.server2.tez.initialize.default.sessions false This flag is used in HiveServer2 to enable a user to use HiveServer2 without turning on Tez for HiveServer2. The user could potentially want to run queries over Tez without the pool of sessions.