The behavior of Hive on MR3 is specified by the configuration file hive-site.xml in the classpath.
Below we describe configuration keys relevant to Hive on MR3.
| Name | Default value | Description |
|---|---|---|
| hive.execution.engine | mr3 | Should be set to tez (or mr3 for Hive 3 on MR3) to use MR3 as the execution engine. |
| hive.execution.mode | container | Hive on MR3 supports both container or llap. Use container for stable execution and llap for fast execution. |
| hive.mr3.application.name.prefix | hive-mr3 | Prefix of MR3 application names |
| hive.mr3.client.connect.timeout | 60000ms | Timeout for Hive on MR3 to establish connection to MR3 DAGAppMaster |
| hive.mr3.resource.vcores.divisor | 1 | Divisor for the number of cores. Legitimate values are integers between 1 to 1000 (inclusive). Affects the interpretation of the following configuration keys: hive.mr3.map.task.vcores, hive.mr3.reduce.task.vcores, hive.mr3.all-in-one.containergroup.vcores, hive.mr3.map.containergroup.vcores, hive.mr3.reduce.containergroup.vcores, hive.mr3.llap.daemon.task.vcores. Example: if hive.mr3.resource.vcores.divisor is set to 1000, a value of 1 is interpreted as a 1000-th of a core. |
| hive.mr3.map.task.memory.mb | -1 | Memory in MB allocated to each mapper. If set to -1, Hive on MR3 reads MRJobConfig.MAP_MEMORY_MB. Can be set to 0 (but not recommended). |
| hive.mr3.reduce.task.memory.mb | -1 | Memory in MB allocated to each reducer. If set to -1, Hive on MR3 reads MRJobConfig.REDUCE_MEMORY_MB. Can be set to 0 (but not recommended). |
| hive.mr3.map.task.vcores | -1 | Number of cores allocated to each mapper. If set to -1, Hive on MR3 reads MRJobConfig.MAP_CPU_VCORES. Can be set to 0 (which can be convenient in some cases). |
| hive.mr3.reduce.task.vcores | -1 | Number of cores allocated to each reducer. If set to -1, Hive on MR3 reads MRJobConfig.REDUCE_CPU_VCORES. Can be set to 0 (which can be convenient in some cases). |
| hive.mr3.dag.queue.capacity.specs | Specifications for capacity scheduling in MR3. Effective only if set to a non-empty string. Corresponds to mr3.dag.queue.capacity.specs in mr3-site.xml. |
|
| hive.mr3.dag.queue.name | default | Name of the Task queue for queries. Used with capacity scheduling in MR3. Corresponds to mr3.dag.queue.name in mr3-site.xml and can be set for individual queries. |
| hive.mr3.dag.include.indeterminate.vertex | false | true: The DAG contains indeterminate Vertexes whose output can vary at each execution. Fault tolerance is not supported when fetch failures occur. false: The DAG contains no indeterminate Vertexes. Corresponds to mr3.dag.include.indeterminate.vertex in mr3-site.xml and can be set for individual queries. If set to true, set hive.mr3.am.task.max.failed.attempts to 1. |
| hive.mr3.container.max.java.heap.fraction | 0.8 | Fraction of task memory to be used as Java heap. Fixed at the time of creating each MR3Session. Corresponds to mr3.container.max.java.heap.fraction in mr3-site.xml. |
| hive.mr3.containergroup.scheme | all-in-one | ContainerGroup scheme: all-in-one, per-map-reduce, or per-vertex. For more details, see ContainerGroup Scheme. |
| hive.mr3.container.env | Environment string for ContainerGroups | |
| hive.mr3.container.java.opts | Java options for ContainerGroups. This key takes precedence over MR3Conf.MR3_CONTAINER_LAUNCH_CMD_OPTS (mr3.container.launch.cmd-opts) in mr3-site.xml. |
|
| hive.mr3.container.stop.cross.dag.reuse | false | true: stop cross-DAG container reuse for ContainerGroups. false: continue cross-DAG container reuse for ContainerGroups. Corresponds to mr3.container.stop.cross.dag.reuse in mr3-site.xml and can be set for individual queries. |
| hive.mr3.container.reuse | true | true: allow container reuse for running different tasks. false: do not allow container reuse. Corresponds to mr3.container.reuse in mr3-site.xml. |
| hive.mr3.container.combine.taskattempts | true | true: allow multiple concurrent tasks in the same container. false: do not allow multiple concurrent tasks in the same container. Corresponds to mr3.container.combine.taskattempts in mr3-site.xml. |
| hive.mr3.container.mix.taskattempts | true | true: allow concurrent tasks from different DAGs in the same container. false: do not allow concurrent tasks from different DAGs in the same container. Corresponds to mr3.container.mix.taskattempts in mr3-site.xml. |
| hive.mr3.container.max.num.workers | Int.MaxValue | Max number of containers that can be created by a ContainerGroup. Corresponds to mr3.container.max.num.workers in mr3-site.xml. |
| hive.mr3.container.use.per.query.cache | true | true: use per-query cache shared by all tasks in the same container. false: do not use. |
| hive.mr3.all-in-one.containergroup.memory.mb | -1 | Memory in MB allocated to each ContainerGroup under all-in-one scheme. If set to 0 or lower, reset to a default value of 1024. |
| hive.mr3.all-in-one.containergroup.vcores | -1 | Number of cores allocated to each ContainerGroup under all-in-one scheme. If set to 0 or lower, reset to a default value of 1. |
| hive.mr3.map.containergroup.memory.mb | -1 | Memory in MB allocated to each mapper ContainerGroup under per-map-reduce or per-vertex scheme. If set to -1, Hive on MR3 reads MRJobConfig.MAP_MEMORY_MB. Can be set to 0 (but not recommended). |
| hive.mr3.reduce.containergroup.memory.mb | -1 | Memory in MB allocated to each reducer ContainerGroup under per-map-reduce or per-vertex scheme. If set to -1, Hive on MR3 reads MRJobConfig.REDUCE_MEMORY_MB. Can be set to 0 (but not recommended). |
| hive.mr3.map.containergroup.vcores | -1 | Number of cores allocated to each mapper ContainerGroup under per-map-reduce or per-vertex scheme. If set to -1, Hive on MR3 reads MRJobConfig.MAP_CPU_VCORES. Can be set to 0 (but not recommended). |
| hive.mr3.reduce.containergroup.vcores | -1 | Number of cores allocated to each reducer ContainerGroup under per-map-reduce or per-vertex scheme. If set to -1, Hive on MR3 reads MRJobConfig.REDUCE_CPU_VCORES. Can be set to 0 (but not recommended). |
| hive.mr3.exec.print.summary | false | true: display breakdown of execution steps for every query. false: do not display. |
| hive.llap.io.enabled | false | true: use LLAP I/O. false: do not use LLAP I/O. |
| hive.mr3.llap.headroom.mb | 1024 | Memory in MB allocated to the headroom for Java VM overhead when LLAP I/O is enabled |
| hive.mr3.llap.daemon.task.memory.mb | 0 | Memory in MB allocated to a DaemonTaskAttempt for LLAP I/O |
| hive.mr3.llap.daemon.task.vcores | 0 | Number of cores allocated to a DaemonTaskAttempt for LLAP I/O |
| hive.mr3.llap.orc.memory.per.thread.mb | 1024 | Memory in MB allocated to each ORC manager in low-level LLAP I/O threads |
| hive.mr3.exec.inplace.progress | true | true: update execution progress in-place in the terminal. false: do not update. |
| hive.mr3.use.daemon.shufflehandler | 0 | Number of shuffle handlers in each ContainerWorker. Corresponds to mr3.use.daemon.shufflehandler in mr3-site.xml. For more details, see Using the MR3 Shuffle Handler in Hive on MR3. |
| hive.server2.mr3.share.session | false | true: run HiveServer2 in shared session mode. false: run HiveServer2 in individual session mode. For more details, see HiveServer2. |
| hive.mr3.mapjoin.interrupt.check.interval | 100000L | Interval (in terms of the number of entries) at which HashTableLoader checks the interrupt state |
| hive.mr3.dag.additional.credentials.source | Comma-separated list of additional paths for obtaining credentials. If a query has no input files (e.g., when creating a fresh table or inserting values to an existing table), HDFS tokens may empty. In such a case, the user can provide additional paths for obtaining credentials so that the query can be executed with proper HDFS tokens. | |
| hive.mr3.localize.session.jars | true | true: localize hive-exec.jar as a local resource. false: do not localize hive-exec.jar (for Hive on Kubernetes). |
| hive.mr3.am.task.max.failed.attempts | 3 | Maximum number of attempts for each Task. Corresponds to mr3.am.task.max.failed.attempts in mr3-site.xml and can be set for individual queries. |
| hive.mr3.delete.vertex.local.directory | false | true: delete the directory for intermediate data of a Vertex when all its destination Vertexes are completed. false: do not delete. Corresponds to mr3.am.notify.destination.vertex.complete in mr3-site.xml and can be set for individual queries. |
| hive.mr3.am.task.concurrent.run.threshold.percent | 100 | Percentage of Tasks that are completed before starting speculative execution. Can be set to an integer between 1 and 100. Setting to 100 disables speculative execution of TaskAttempts. Corresponds to mr3.am.task.concurrent.run.threshold.percent in mr3-site.xml and can be set for individual queries. |
| hive.mr3.zookeeper.appid.namespace | mr3AppId | ZooKeeper namespace for sharing Application ID |
| hive.tez.llap.min.reducer.per.executor | 0.2 | Fraction of the number of Tasks to use for Reducers. For more details, see Basic Performance Tuning. |
| hive.mr3.compaction.using.mr3 | false | true: perform compaction using MR3. High Availability should be enabled. false: perform compaction using MapReduce. For more details, see Enabling Compaction. |
| hive.mr3.config.remove.keys | Comman-separated list of config keys to remove from JobConf to be passed to Tez | |
| hive.mr3.config.remove.prefixes | Comma-separated list of key prefixes to remove from JobConf to be passed to Tez |
