tez | Apache Tez is a generic data
kandi X-RAY | tez Summary
kandi X-RAY | tez Summary
Apache Tez is a generic data-processing pipeline engine envisioned as a low-level engine for higher abstractions such as Apache Hadoop Map-Reduce, Apache Pig, Apache Hive etc.
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Top functions reviewed by kandi - BETA
- Assign a delayed container .
- Parses summary data .
- Create application submission context .
- Initialize the instance .
- Fetch all inputs from the given input stream .
- Merge the output files and index files .
- Fetches the map output from the given input stream .
- Creates the critical path step .
- Finalize the final merge phase .
- Route a list of events .
tez Key Features
tez Examples and Code Snippets
Community Discussions
Trending Discussions on tez
QUESTION
I've been struggling with the Apache Zeppelin notebook version 0.10.0 setup for a while. The idea is to be able to connect it to a remote Hortonworks 2.6.5 server that runs locally on Virtualbox in Ubuntu 20.04. I am using an image downloaded from the:
https://www.cloudera.com/downloads/hortonworks-sandbox.html
Of course, the image has pre-installed Zeppelin which works fine on port 9995, but this is an old 0.7.3 version that doesn't support Helium plugins that I would like to use. I know that HDP version 3.0.1 has updated Zeppelin version 0.8 onboard, but its use due to my hardware resource is impossible at the moment. Additionally, from what I remember, enabling Leaflet Map Plugin there was a problem either.
The first thought was to update the notebook on the server, but after updating according to the instructions on the Cloudera forums (unfortunately they are not working at the moment, and I cannot provide a link or see any other solution) it failed to start correctly. A simpler solution seemed to me now to connect the newer notebook version to the virtual server, unfortunately, despite many attempts and solutions from threads here with various configurations, I was not able to connect to Hive via JDBC. I am using Zeppelin with local Spark 3.0.3 too, but I have some geodata in Hive that I would like to visualize this way.
I used, among others, the description on the Zeppelin website:
https://zeppelin.apache.org/docs/latest/interpreter/jdbc.html#apache-hive
This is my current JDBC interpreter configuration:
...ANSWER
Answered 2022-Feb-22 at 16:53So, after many hours and trials, here's a working solution. First of all, the most important thing is to use drivers that correlate with your version of Hadoop. Needed are jar files like 'hive-jdbc-standalone' and 'hadoop-common' in their respective versions and to avoid adding all of them in the 'Artifact' field of the %jdbc interpreter in Zeppelin it is best to use one complete file containing all required dependencies. Thanks to Tim Veil it is available in his Github repository below:
https://github.com/timveil/hive-jdbc-uber-jar/
This is my complete Zeppelin %jdbc interpreter settings:
QUESTION
I have a CDP environment running Hive, for some reason some queries run pretty quickly and others are taking even more than 5 minutes to run, even a regular select current_timestamp or things like that. I see that my cluster usage is pretty low so I don't understand why this is happening.
How can I use my cluster fully? I read some posts in the cloudera website, but they are not helping a lot, after all the tuning all the things are the same.
Something to note is that I have the following message in the hive logs:
...ANSWER
Answered 2022-Jan-29 at 17:16Besides taking care of the overall tuning: https://community.cloudera.com/t5/Community-Articles/Demystify-Apache-Tez-Memory-Tuning-Step-by-Step/ta-p/245279
Please check my answer to this same issue here Enable hive parallel processing
That post explains what you need to do to enable parallel processing.
QUESTION
I have a tez problem, when running about 14 queries at the same time, some of them get delays of more than 5 minutes, but the cluster utilization is just 14%.
This is the message that I am talking about.
INFO SessionState: [HiveServer2-Background-Pool: Thread-322319]: Get Query Coordinator (AM) 308.84s
My configuration is the following:
...ANSWER
Answered 2022-Jan-27 at 14:44There is a behavior that is not really well explained in the documentation, the fact that in order to really utilize the cluster and all your additional memory configurations you MUST set up default queues, and you need to specify them when you are going to query, or to connect spark, etc.
For example, when using tez, you need to use the tez.name.queue={your queue name} in order to fully utilize it, this enables parallelism in yarn.
For spark, you need to specify the --queue {your queue name} when launching pyspark, or when submitting jobs using the spark_submit.
In order to use the above, you need to have queues set up in yarn using the hive.server2.tez.default.queues, parameter that you need to set up with the list of default queues for tez. It is important to note that you can create the queues and not list them as default, by doing that you need need to call out the queue manually all the time and the queries are not going to get into any default queue.
QUESTION
I am experiencing outofmemory issue while joining 2 datasets; one contains 39M rows other contain 360K rows.
I have 2 worker nodes, each of the worker node has maximum memory of 125 GB.
In Yarn Memory allocated for all YARN containers on a node = 96GB
Minimum Container Size (Memory) = 3072
In Hive settings :
hive.tez.java.opts=-Xmx2728M -Xms2728M -Djava.net.preferIPv4Stack=true -XX:NewRatio=8 -XX:+UseNUMA -XX:+UseG1GC -XX:+ResizeTLAB
hive.tez.container.size=3410
What values I should set to get rid of outofmemory issue.
...ANSWER
Answered 2021-Nov-02 at 16:03I solved it by using increasing the Yarn Memory allocated Minimum Container Size (Memory) = 3072 to 3840 Memory allocated for all YARN containers on a node 96 to 120 GB ( each node had 120GB)
Percentage of physical CPU allocated for all containers on a node 80%
Number of virtual cores 8
https://docs.microsoft.com/en-us/azure/hdinsight/hdinsight-hadoop-hive-out-of-memory-error-oom
QUESTION
I started with hive and tez some days back during one of my projects. During that time, I came across this property tez.am.container.reuse.enabled which is recommended to be kept as true by many sites. I understand it's due to :
- Limiting requests for new containers to RM
- Reducing the cost of container spin up and hence add to time savings
But I can't think of any scenario where we would want this property to be disabled. I have been searching online for any such cases but I'm not able to find any.
Can anyone help me with this?
...ANSWER
Answered 2021-Oct-28 at 07:40In terms of performance, there is no reason not to re-use the containers, Execution Efficiency section of this paper explains very well, and this is why the default value for this parameter is true.
But, I think there are some cases which might explain why this feature is still configurable;
- You may want to disable it for workaround purpose. For example, this hive ticket is still unresolved and when
tez.am.container.reuse.enabled=falsethe problematic query works fine. If my production case is critical, instead of being completely blocked, I may prefer running my jobs without re-using the containers. - The property may conflict with some other properties, and based on your priority, you may wanna give up on performance. For example in Configure Tez Container Reuse doc, there is a warning which says;
Do not use the
tez.queue.nameconfiguration parameter because it sets all Tez jobs to run on one particular queue.
- As a last item, I saw another warning on this doc;
Enabling this parameter improves performance by avoiding the memory overhead of reallocating container resources for every task. However, disable this parameter if the tasks contain memory leaks or use static variables.
QUESTION
I am trying to write a program to communicate with ESP32 modules via bluetooth. For the program to work, Bt must be turned on and the FINE_LOCATION permission granted. I am using API 29.
The code below works, but it can be done much better.
I am a beginner, this is the only way I can do it.
I have a few questions :
Can I use shouldShowRequestPermissionRationale(Manifest.permission.ACCESS_FINE_LOCATION) together with ActivityResultContracts.RequestPermission(), if yes how?
To achieve my goal if the user refuses the first time to grant permissions, I run an almost identical contract with a different dialog.How can this code be reduced?
How to simplify this constant checking:
...ANSWER
Answered 2021-Sep-18 at 01:43What I would do is display an AlertDialog first saying, you MUST ACCEPT all permissions in order to precede then Request Permissions until the user agrees to them all.
QUESTION
My table is:
I wanna count, for every month, the total of access of each user in every product, aaand the total of access, for every month, for that user, ignoring products.
So, in my result, i need to show something like this: (7 distinct days in month 07/2020 for that user, 1 distinct day for produto Spark, 6 distinct days for MapReduce and 7 distinct days for Tez)
So, for month 07/2020, this user_1 has:
7 total access in that month
1 total access for Spark
6 total acesss for MapReduce
7 total access for Tez
...
ANSWER
Answered 2021-Sep-13 at 12:58Hmmm . . . based on your sample data and desired results, this looks like relatively simple aggregation:
QUESTION
Using Hive 1.2.1000.2 on Azure HDInsight 3.6 performing an INNER JOIN to get the count of records that are present both in Table_1 and Table_2.
Details of the tables:
Table_1: 310M records
Sample data:
...ANSWER
Answered 2021-Aug-29 at 05:12Performed the following steps, it helped! and hope it help others:
- Removed the records which had no value i.e.
order_id='' - Performed the JOIN in batches rather than doing all in one go
- Referred the below for setting certain hive properties:
QUESTION
I am trying to run an insert command which inner joins 2 tables with data in one table as 34567892 and another table is 6754289. The issue is , the mappers are not getting started after completing 2%. I have used various properties like set tez.am.resource.memory.mb=16384; set hive.tez.container.size=16384; set hive.tez.java.opts=-Xms13107m; but still no luck. Can someone please help me to figure out what to do?
...ANSWER
Answered 2021-Jul-26 at 11:08Through researching a lot, I have found the following properties helpful and which ran my query in 2-3 minutes:
- set hive.auto.convert.join = false;
- set hive.exec.parallel=true;
- set hive.exec.compress.output=true;
- set hive.exec.parallel=true;
- set hive.cbo.enable=true;
- set hive.compute.query.using.stats=true;
- set hive.stats.fetch.column.stats=true;
- set hive.stats.fetch.partition.stats=true;
QUESTION
I have a use case where I would like to mix a jdbc transaction with jooq context.
The JDBC code looks like that:
...ANSWER
Answered 2021-Jul-05 at 15:15If you want to get the query string from jOOQ you can call
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Install tez
You can use tez like any standard Java library. Please include the the jar files in your classpath. You can also use any IDE and you can run and debug the tez component as you would do with any other Java program. Best practice is to use a build tool that supports dependency management such as Maven or Gradle. For Maven installation, please refer maven.apache.org. For Gradle installation, please refer gradle.org .
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