Impala on Oracle Big Data Appliance FAQ
(Doc ID 1615639.1)
Last updated on FEBRUARY 13, 2022
Applies to:
Big Data Appliance Integrated Software - Version 2.0.1 and laterLinux x86-64
Purpose
Frequently Asked Questions for Impala on the Oracle Big Data Appliance (BDA).
Questions and Answers
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In this Document
| Purpose |
| Questions and Answers |
| What is Cloudera Impala? |
| Where is Impala metadata stored on the BDA? |
| What is the impala-shell? |
| What is an impalad? |
| Is Impala V1.2.3 supported on BDA V2.3.1 with Cloudera Manager 4.7? |
| Is Impala installed on BDA V2.3.1? |
| Can Impala V1.1.1 be installed on versions of the BDA prior to V2.3.1? |
| Is the use of INVALIDATE METADATA the same for Impala V1.2 and higher as with V1.1.1? |
| Is the use of INVALIDATE METADATA the same for Impala V1.0.1? |
| For Impala version 1.0 and above is it necessary to install the impala-lzo libraries that match the version installed on the BDA cluster? |
| How can I install Impala 1.0.1 on the BDA v2.1/v2.2? |
| Does Impala support "org.apache.hadoop.hive.contrib.serde2.RegexSerDe" SerDe? |
| What are the tradeoffs of using Impala and HBase together? |
| If using Impala and HBase together is there anything in particular to check in CM? |
| When Impala is managed by Cloudera Manager why is the impala-state-store service down at the OS level? |
| When Impala is managed by CM why is does chkconfig reports that the impala service is off at all runlevels? |
| Why would the chkconfig output above report information on the impala-catalog service and impala-server service as well as about impala-state-store? |
| Does Impala support har files? |
| On the BDA what versions can you upgrade Impala to? |
| When upgrading impala why do we only upgrade impala and impala-shell but not impala-catalog, impala-state-store & impala-server? |
| Details about using Parquet File Format with Impala Tables? |
| What should be the size of Parquet File for use with Impala? |
| Is it possible to set up Impala/Llama on BDA 3.0.1 to make Impala queries utilizing YARN resources? |
| Is Llama supported for Impala in versions post CDH 5.1? |
| Is using Oracle Clusterware instead of HAProxy and Keepalive a certified alternative for HA for Impala? |
| Are there any best practices for running Impala queries? |
| What is the recommendation on when to run compute stats? |
| If the Impala logs shows a SIGSEGV is there any suggestion for collecting more detailed diagnostics? |
| If the Impala mem_limit is set, what are queries raising "memory limits exceeded"? |
| Is there any documentation on configuring memory for impala? |
| How can I check the heap usage of the Impala catalog server? |
| How can I see the debug Web UI of the Impala StateStore? |
| Are there general guidelines for distributing vcores to yarn / impala with static pools in mind? |
| Does Impala Admission Control support sub-pool creation? |
| Is it possible to see the "explain plan" in Sentry and Impala before executing the sql or only after running it? |
| If the Impala Catalog Daemon is found to create large logs what could cause that? |
| Is there a best practice or set of guidelines for implementing implala load balancing on the BDA? |
| References |