Tuesday, September 11, 2018
How to start KSQL server in server-client mode on MapR platform
Goal: KSQL can start in local(standalone mode) using CLI, and it also can start the server-client mode shown as below. This article ju...
Friday, September 7, 2018
How to dig into the Kafka Streams/ksql's statestore in RocksDB
Goal: By default, Kafka Streams and ksql use RocksDB as the internal state store. This feature is used for: an internally created and c...
How to use ksql on MapR Streams(MapR-ES)
Goal: KSQL is a streaming SQL engine that enables stream processing against Apache Kafka and MapR Streams(aka MapR-ES). KSQL interacts dir...
Wednesday, September 5, 2018
How to use Drill on MapR Streams through kafka storage plugin
Goal: How to use Drill on MapR Streams through kafka storage plugin.
Thursday, July 19, 2018
Drill query fails with "AGGR OOM at First Phase" when doing Hash Aggregate
Symptom: Drill query fails with "AGGR OOM at First Phase" when doing Hash Aggregate. Sample error message or stacktrace is: 20...
Tuesday, July 10, 2018
Hive: Different lock behaviors between DummyTxnManager and DbTxnManager
Goal Understand the different lock behaviors between DummyTxnManager and DbTxnManager in Hive. The example query is INSERT into a partitio...
Friday, June 8, 2018
How to control the parallelism of Spark job
Goal: This article explains how to control the parallelism of Spark job and uses a Spark on YARN job to demonstrate.
Monday, November 13, 2017
How to configure LDAP client by using SSSD for authentication on CentOS
Goal: How to configure LDAP client by using SSSD(System Security Services Daemon) for authentication on CentOS.
Monday, November 6, 2017
How to install and configure MapR Hive ODBC driver on Linux
Goal: How to install and configure MapR Hive ODBC driver on Linux. This article gives detailed step-by-step instructions as a supplement ...
Monday, October 30, 2017
How to modify hbase thrift client code if Hbase Thrift Service enables framed transport and compact protocol
Goal: How to modify hbase thrift client code if Hbase Thrift Service enables framed transportation and compact protocol. The background i...
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