Popular articles

How do I find the Hive query log?

by Author

How do I find the Hive query log?

Make sure that the logs folder exist in current directory….2 Answers

  1. /tmp/${user.name} in Hive 0.2. 0 through 0.8.
  2. /tmp/hive-${user.name} in Hive 0.8. 1 through 0.14.
  3. /tmp/hive in Hive 0.14. 0 and later.

Can we do log analysis with Hive?

Apache Hive is a data warehouse infrastructure built on top of Hadoop. It allows processing of data with SQL like queries and it’s very pluggable so we can configure it to process our logs quite easily.

How Hive query is executed?

Interface of the Hive such as Command Line or Web user interface delivers query to the driver to execute. In this, UI calls the execute interface to the driver such as ODBC or JDBC. Driver designs a session handle for the query and transfer the query to the compiler to make execution plan.

How long should a Hive query take?

Each subselect by itself takes about 25 seconds. The query without grabbing the name takes 2 minutes, but as soon as the join comes in time is exploding.

READ:   What is it called when you feel all alone?

How do I find my Hive application ID?

  1. From the Ambari home page, hover over the top right corner, and select “Tez View”
  2. Next, you can either search by application ID or the hive query itself to find your application.
  3. Select your application – the entire hive query should be displayed here and also you can see the status of the query.

How do I see Hive history?

In the Heating History tab you can see all of the data that’s been gathered since your Hive Active Heating was installed. Please note: If you have reinstalled your thermostat at any stage, data will only be available from the new installation date.

What applications are supported by hive?

Hive supports all those client applications that are written in:

  • Java.
  • PHP.
  • Python.
  • C++
  • Ruby.

What happens when a query is submitted in hive?

Hive Compiler Hive compiler parses the query. It performs semantic analysis and type-checking on the different query blocks and query expressions by using the metadata stored in metastore and generates an execution plan.

READ:   Is wingsuit flying safe?

How do I tune a Hive query?

Below are the list of practices that we can follow to optimize Hive Queries.

  1. Enable Compression in Hive.
  2. Optimize Joins.
  3. Avoid Global Sorting in Hive.
  4. Enable Tez Execution Engine.
  5. Optimize LIMIT operator.
  6. Enable Parallel Execution.
  7. Enable Mapreduce Strict Mode.
  8. Single Reduce for Multi Group BY.

How do I make Hive queries faster?

How to Improve Hive Query Performance With Hadoop

  1. Use Tez Engine. Apache Tez Engine is an extensible framework for building high-performance batch processing and interactive data processing.
  2. Use Vectorization.
  3. Use ORCFile.
  4. Use Partitioning.
  5. Use Bucketing.
  6. Cost-Based Query Optimization.

How do I see hive temp history?

I set myself the task of getting historic temperature data from Hive, and it turns out it’s quite easy – at least to manually extract it. I went into Hive, went to ‘My Hive Home’, click on ‘heating’, then scroll down, and it gives the temperature over different periods of time. Which is fantastic.

Does hive have an API?

You can use the Hive API to accomplish awesome things for your team, like creating automated messages, kicking off action templates, and much more!

READ:   Can a car be jump started through the cigarette lighter?

How do I check hive X Server starting logs?

Hive starting logs from all boots: journalctl -u hive. Hive X server (graphical interface) starting log. “-b0” is the option to show only the current boot. May be helpful inspecting X server problems.

Where are hive logs stored in a cluster?

Hive logs are stored in the following directories on the cluster’s master node. For more information, see View log files on the master node. All query-related errors are logged in the /mnt/var/log/hive/user/ directory.

How to use hiveserver2 logs to troubleshoot service-related problems?

You can also use the hive-server2 logs to troubleshoot service-related problems such as slow queries, HiveServer2 start failures, query submission issues, and so on. Check the step logs, which are located in /var/log/hadoop/steps/. For example:

Can beeline or SQL Workbench run queries on hive-server2?

HiveServer2 allows clients such as Beeline or SQL Workbench/J to run queries against Hive. For more information, see HiveServer2 overview on the Hive website. If you have trouble connecting to Hive from clients using JDBC or ODBC drivers, check for errors in the hive-server2 logs:

https://www.youtube.com/watch?v=WHfCTsX8Dy4