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        • Introduction to Impala Application Development - MapReduce Service

          Introduction to Impala Application Development - MapReduce Service

          Introduction to Impala Application Development Introduction to Impala Impala provides fast, interactive SQL queries directly on your Apache Hadoop data stored in HDFS, HBase, or Object Storage Service (OBS).

          Help > MapReduce Service > Developer Guide (Normal_Earlier Than 3.x) > Impala Development Guide > Impala Application Development Overview
        • Impala - MapReduce Service

          Impala - MapReduce Service

          Impala Impala Impala provides fast, interactive SQL queries directly on your Apache Hadoop data stored in HDFS, HBase, or the Object Storage Service (OBS).

          Help > MapReduce Service > Service Overview > Components
        • Configuring YARN Big Job Scanning - MapReduce Service

          Configuring YARN Big Job Scanning - MapReduce Service

          Configuring YARN Big Job Scanning YARN's big job scanning function monitors local temporary files (such as shuffle files) and key HDFS directories (OBS is not supported) for Hive, HetuEngine, and Spark jobs.

          Help > MapReduce Service > Component Operation Guide (LTS) > Using YARN > Yarn O&M Management
        • Does MRS Support Read and Write Operations on DLI Service Tables? - MapReduce Service

          Does MRS Support Read and Write Operations on DLI Service Tables? - MapReduce Service

          Answer: If you have stored data on OBS, you can use Spark in MRS to read Data Lake Insight (DLI) tables, flexibly process table data, and save the result to another DLI table. If you have not stored data on OBS, you cannot use MRS to read or write DLI tables.

          Help > MapReduce Service > FAQs > Peripheral Service Interconnection
        • Hive Tables Supporting Cascading Authorization - MapReduce Service

          Hive Tables Supporting Cascading Authorization - MapReduce Service

          Search for hive.metastore.warehouse.dir in the search box and change the parameter value to an OBS path, for example, obs://hivetest/user/hive/warehouse/. hivetest indicates the OBS file system name.

          Help > MapReduce Service > Component Operation Guide (LTS) > Using Ranger > Configuration Examples for Ranger Permission Policy
        • Preparing the Bootstrap Action Script for an MRS Node - MapReduce Service

          Preparing the Bootstrap Action Script for an MRS Node - MapReduce Service

          Therefore, MRS VMs cannot download OBS files from other regions. Use a script for downloading files from the OBS file system. You can specify the file to be downloaded from OBS in the script.

          Help > MapReduce Service > User Guide > Managing Clusters > Managing MRS Cluster Nodes > Configuring Bootstrap Actions for an MRS Cluster Node
        • Common Operations of Alluxio - MapReduce Service

          Common Operations of Alluxio - MapReduce Service

          Replace the file system name with the actual one. alluxio fs mount /mnt/obs obs://obs-mrstest/data Mounted obs://obs-mrstest/data at /mnt/obs List files in the OBS file system using the Alluxio namespace.

          Help > MapReduce Service > Component Operation Guide (Normal) > Using Alluxio
        • Using Hadoop - MapReduce Service

          Using Hadoop - MapReduce Service

          Set the path of the executable program to the address of the program stored on the OBS, for example, obs://wordcount01/program/hadoop-mapreduce-examples-x.x.x.jar. Enter wordcount obs://wordcount01/input/ obs://wordcount01/output/ in the Parameter pane.

          Help > MapReduce Service > Component Operation Guide (Normal) > Using HDFS
        • Using Hadoop from Scratch - MapReduce Service

          Using Hadoop from Scratch - MapReduce Service

          Set the path of the executable program to the address of the program stored on the OBS, for example, obs://wordcount01/program/hadoop-mapreduce-examples-x.x.x.jar. Enter wordcount obs://wordcount01/input/ obs://wordcount01/output/ in the Parameter pane.

          Help > MapReduce Service > Component Operation Guide (LTS) > Using HDFS
        • Configuring Separate Storage for HBase Cold and Hot Data - MapReduce Service

          Configuring Separate Storage for HBase Cold and Hot Data - MapReduce Service

          Search for and modify the following parameters: fs.coldFS: OBS file system name, for example, obs://OBS parallel file system name hbase.fs.hot.cold.enabled: The default value is false.

          Help > MapReduce Service > Component Operation Guide (LTS) > Using HBase > Enterprise-Class Enhancements of HBase > Configuring Hot-Cold Data Separate in HBase
        • FAQ About Decoupled Storage and Compute - MapReduce Service

          FAQ About Decoupled Storage and Compute - MapReduce Service

          FAQ About Decoupled Storage and Compute How Do I Read Encrypted OBS Data When Running an MRS Job? Example Application Development for Interconnecting HDFS with OBS How Do I Connect an MRS Cluster Client to OBS Using an AK/SK Pair?

          Help > MapReduce Service > User Guide > Configuring Storage-Compute Decoupling for an MRS Cluster
        • Storing ClickHouse Cold and Hot Data Separately - MapReduce Service

          Storing ClickHouse Cold and Hot Data Separately - MapReduce Service

          Folder name: name of the folder created in the OBS parallel file system disk_s3 indicates the OBS disk name, which can be customized. Figure 3 Configuring an OBS disk with clickhouse-config-customize (Optional) Cache data stored on OBS to local storage to accelerate data query.

          Help > MapReduce Service > Component Operation Guide (LTS) > Using ClickHouse > Enterprise-Class Enhancements of ClickHouse
        • Running a MapReduce Job - MapReduce Service

          Running a MapReduce Job - MapReduce Service

          The OBS program path should start with obs://, for example, obs://wordcount/program/XXX.jar. The HDFS program path should start with hdfs://, for example, hdfs://hacluster/user/XXX.jar.

          Help > MapReduce Service > User Guide > Submitting an MRS Job > Running an MRS Job
        • Storage-Compute Decoupling - MapReduce Service

          Storage-Compute Decoupling - MapReduce Service

          OBS Because the NTP Time of Cluster Nodes Is Not Synchronized

          Help > MapReduce Service > Troubleshooting
        • Loader Link Configuration - MapReduce Service

          Loader Link Configuration - MapReduce Service

          Table 1 obs-connector configuration Parameter Description Name Name of a Loader connection OBS Server Enter an OBS endpoint. The common format is OBS.Region.DomainName.

          Help > MapReduce Service > Component Operation Guide (Normal) > Using Loader
        • Preparing for a LakeFormation Data Connection - MapReduce Service

          Preparing for a LakeFormation Data Connection - MapReduce Service

          the OBS object name.

          Help > MapReduce Service > User Guide > Managing Clusters > Managing MRS Cluster Metadata > Configuring a LakeFormation Data Connection
        • A Spark Job Fails to Run Due to Incorrect JAR File Import - MapReduce Service

          A Spark Job Fails to Run Due to Incorrect JAR File Import - MapReduce Service

          Check the executable programs in the OBS bucket. The executable programs can be stored in HDFS or OBS. The paths vary according to file systems. OBS storage path: starts with obs://, for example, obs://wordcount/program/hadoop-mapreduce-examples-2.7.x.jar.

          Help > MapReduce Service > Troubleshooting > Using Spark
        • Exporting Data - MapReduce Service

          Exporting Data - MapReduce Service

          HDFS or OBS to a Relational Database Typical Scenario: Exporting Data from HBase to a Relational Database Typical Scenario: Exporting Data from Hive to a Relational Database Typical Scenario: Importing Data from HBase to HDFS or OBS Parent topic: Using Loader

          Help > MapReduce Service > Component Operation Guide (Normal) > Using Loader
        • Creating a Loader Data Export Job - MapReduce Service

          Creating a Loader Data Export Job - MapReduce Service

          Data from HDFS or OBS to a Relational Database Using Loader to Export Data from HDFS to MOTService Using Loader to Export Data from HBase to a Relational Database Using Loader to Export Data from Hive to a Relational Database Using Loader to Export Data from HBase to HDFS or OBS Using

          Help > MapReduce Service > Component Operation Guide (LTS) > Using Loader
        • Adding MRS Node Bootstrap Actions and Installing Third-Party Software - MapReduce Service

          Adding MRS Node Bootstrap Actions and Installing Third-Party Software - MapReduce Service

          Script Path obs://mrs-samples/xxx.sh Script path. The value can be an OBS file system path or a local VM path. An OBS file system path must start with obs:// and end with .sh, for example, obs://mrs-samples/xxx.sh. A local VM path must start with a slash (/) and end with .sh.

          Help > MapReduce Service > User Guide > Managing Clusters > Managing MRS Cluster Nodes > Configuring Bootstrap Actions for an MRS Cluster Node
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