materialize | distributed SQL database built on streaming internals

 by   MaterializeInc Rust Version: v0.56.2 License: Non-SPDX

kandi X-RAY | materialize Summary

kandi X-RAY | materialize Summary

materialize is a Rust library. materialize has no bugs, it has no vulnerabilities and it has medium support. However materialize has a Non-SPDX License. You can download it from GitHub.

Materialize lets you ask questions of your live data, which it answers and then maintains for you as your data continue to change. The moment you need a refreshed answer, you can get it in milliseconds. Materialize is designed to help you interactively explore your streaming data, perform data warehousing analytics against live relational data, or just increase the freshness and reduce the load of your dashboard and monitoring tasks. Materialize focuses on providing correct and consistent answers with minimal latency. It does not ask you to accept either approximate answers or eventual consistency. Whenever Materialize answers a query, that answer is the correct result on some specific (and recent) version of your data. Materialize does all of this by recasting your SQL92 queries as dataflows, which can react efficiently to changes in your data as they happen. Materialize is powered by timely dataflow, which connects the times at which your inputs change with the times of answers reported back to you.
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            kandi-support Support

              materialize has a medium active ecosystem.
              It has 5159 star(s) with 424 fork(s). There are 78 watchers for this library.
              There were 1 major release(s) in the last 12 months.
              There are 1820 open issues and 4155 have been closed. On average issues are closed in 70 days. There are 243 open pull requests and 0 closed requests.
              It has a neutral sentiment in the developer community.
              The latest version of materialize is v0.56.2

            kandi-Quality Quality

              materialize has no bugs reported.

            kandi-Security Security

              materialize has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

            kandi-License License

              materialize has a Non-SPDX License.
              Non-SPDX licenses can be open source with a non SPDX compliant license, or non open source licenses, and you need to review them closely before use.

            kandi-Reuse Reuse

              materialize releases are available to install and integrate.
              Installation instructions, examples and code snippets are available.

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            materialize Key Features

            No Key Features are available at this moment for materialize.

            materialize Examples and Code Snippets

            No Code Snippets are available at this moment for materialize.

            Community Discussions

            QUESTION

            Accessing Aurora Postgres Materialized Views from Glue data catalog for Glue Jobs
            Asked 2021-Jun-15 at 13:51

            I have an Aurora Serverless instance which has data loaded across 3 tables (mixture of standard and jsonb data types). We currently use traditional views where some of the deeply nested elements are surfaced along with other columns for aggregations and such.

            We have two materialized views that we'd like to send to Redshift. Both the Aurora Postgres and Redshift are in Glue Catalog and while I can see Postgres views as a selectable table, the crawler does not pick up the materialized views.

            Currently exploring two options to get the data to redshift.

            1. Output to parquet and use copy to load
            2. Point the Materialized view to jdbc sink specifying redshift.

            Wanted recommendations on what might be most efficient approach if anyone has done a similar use case.

            Questions:

            1. In option 1, would I be able to handle incremental loads?
            2. Is bookmarking supported for JDBC (Aurora Postgres) to JDBC (Redshift) transactions even if through Glue?
            3. Is there a better way (other than the options I am considering) to move the data from Aurora Postgres Serverless (10.14) to Redshift.

            Thanks in advance for any guidance provided.

            ...

            ANSWER

            Answered 2021-Jun-15 at 13:51

            Went with option 2. The Redshift Copy/Load process writes csv with manifest to S3 in any case so duplicating that is pointless.

            Regarding the Questions:

            1. N/A

            2. Job Bookmarking does work. There is some gotchas though - ensure Connections both to RDS and Redshift are present in Glue Pyspark job, IAM self ref rules are in place and to identify a row that is unique [I chose the primary key of underlying table as an additional column in my materialized view] to use as the bookmark.

            3. Using the primary key of core table may buy efficiencies in pruning materialized views during maintenance cycles. Just retrieve latest bookmark from cli using aws glue get-job-bookmark --job-name yourjobname and then just that in the where clause of the mv as where id >= idinbookmark

              conn = glueContext.extract_jdbc_conf("yourGlueCatalogdBConnection") connection_options_source = { "url": conn['url'] + "/yourdB", "dbtable": "table in dB", "user": conn['user'], "password": conn['password'], "jobBookmarkKeys":["unique identifier from source table"], "jobBookmarkKeysSortOrder":"asc"}

            datasource0 = glueContext.create_dynamic_frame.from_options(connection_type="postgresql", connection_options=connection_options_source, transformation_ctx="datasource0")

            That's all, folks

            Source https://stackoverflow.com/questions/67928401

            QUESTION

            transform file/directory structure into 'tree' in vue json
            Asked 2021-Jun-15 at 01:45

            transform file/directory structure into 'tree' in vue json

            I have an array of objects that looks like this:

            ...

            ANSWER

            Answered 2021-Jun-11 at 09:55

            EDIT

            Here is the full implementation, based upon my initial answer. I changed the forEach() into map() as it is more suitable in this case.

            Source https://stackoverflow.com/questions/67915991

            QUESTION

            Sliding window based on Akka actor source not behaving as expected
            Asked 2021-Jun-14 at 16:30

            Using below code I'm attempting to use an actor as a source and send messages of type Double to be processed via a sliding window.

            The sliding windows is defined as sliding(2, 2) to calculate each sequence of twp values sent.

            Sending the message:

            ...

            ANSWER

            Answered 2021-Jun-14 at 11:39

            The short answer is that your source is a recipe of sorts for materializing a Source and each materialization ends up being a different source.

            In your code, source.to(Sink.foreach(System.out::println)).run(system) is one stream with the materialized actorRef being only connected to this stream, and

            Source https://stackoverflow.com/questions/67961179

            QUESTION

            System.InvalidOperationException: Invalid attempt to call FieldCount when reader is closed
            Asked 2021-Jun-12 at 22:45
            1. I would have expected the queryOutput to be materialized?
            2. Why is there the invalid attempt to call fieldcount when it alreadyhas the IEnumerable?
            ...

            ANSWER

            Answered 2021-Jun-12 at 20:53

            Dapper's supposed to make your life easier, and that code looks complicated.

            If you use a Tuple with named fields, you can just use Dapper's auto mapping to materialize. EG:

            Source https://stackoverflow.com/questions/67952549

            QUESTION

            Evaluate simple RNN in Julia Flux
            Asked 2021-Jun-11 at 12:27

            I'm trying to learn Recurrent Neural Networks (RNN) with Flux.jl in Julia by following along some tutorials, like Char RNN from the FluxML/model-zoo.

            I managed to build and train a model containing some RNN cells, but am failing to evaluate the model after training.

            Can someone point out what I'm missing for this code to evaluate a simple (untrained) RNN?

            ...

            ANSWER

            Answered 2021-Jun-11 at 12:27

            Turns out it's just a problem with the input type.

            Doing something like this will work:

            Source https://stackoverflow.com/questions/67934386

            QUESTION

            CQRS: Can the write model consume a read model?
            Asked 2021-Jun-11 at 07:38

            When reading about CQRS it is often mentioned that the write model should not depend on any read model (assuming there is one write model and up to N read models). This makes a lot of sense, especially since read models usually only become eventually consistent with the write model. Also, we should be able to change or replace read models without breaking the write model.

            However, read models might contain valuable information that is aggregated across many entities of the write model. These aggregations might even contain non-trivial business rules. One can easily imagine a business policy that evaluates a piece of information that a read model possesses, and in reaction to that changes one or many entities via the write model. But where should this policy be located/implemented? Isn't this critical business logic that tightly couples information coming from one particular read model with the write model?

            When I want to implement said policy without coupling the write model to the read model, I can imagine the following strategy: Include a materialized view in the write model that gets updated synchronously whenever a relevant part of the involved entities changes (when using DDD, this could be done via domain events). However, this denormalizes the write model, and is effectively a special read model embedded in the write model itself.

            I can imagine that DDD purists would say that such a policy should not exist, because it represents a business invariant/rule that encompasses multiple entities (a.k.a. aggregates). I could probably agree in theory, but in practice, I often encounter such requirements anyway.

            Finally, my question is simply: How do you deal with requirements that change data in reaction to certain conditions whose evaluation requires a read model?

            ...

            ANSWER

            Answered 2021-Jun-07 at 01:20

            First, any write model which validates commands is a read model (because at some point validating a command requires a read), albeit one that is optimized for the purpose of validating commands. So I'm not sure where you're seeing that a write model shouldn't depend on a read model.

            Second, a domain event is implicitly a command to the consumers of the event: "process/consider/incorporate this event", in which case a write model processor can subscribe to the events arising from a different write model: from the perspective of the subscribing write model, these are just commands.

            Source https://stackoverflow.com/questions/67863289

            QUESTION

            Webpage using appScript: innerHTML assignment not working
            Asked 2021-Jun-09 at 22:03

            I have a simple WebApp application that reads the data from google sheet and displays in HTML using materialize css( 1.0.0), JS. I am new to this stack of tools. HTML page has 2 containers and bottom one supposed to be populated (using innerHTML assignment)based on the selection on the top container. The bottom container content is simple card contents in table format. I want to put a HTML Select object with List of values to be displayed and created a Appscript function. I am assigning the function output to innerHTML like this. -- JS

            ...

            ANSWER

            Answered 2021-Jun-09 at 22:03

            I was using google Webapp. It looks google doesn't allow the editing of dynamically created items. So I ended up using Modals to make the selections and save it.

            Source https://stackoverflow.com/questions/67764340

            QUESTION

            Strange mobile css behavior
            Asked 2021-Jun-09 at 12:02

            I have a basic CSS photo gallery that works pretty well on desktop devices, and works well also if I simulate a mobile view in Mozilla Responsive Design Mode or this CodePen but doesn't seems to work properly on real mobile devices.

            ...

            ANSWER

            Answered 2021-Jun-09 at 12:02

            The flex children are set to stretch by default. And when your child, that is, img tag is set to "height:auto;". It stretches.

            You can change that behavior with "align-items" property.

            Source https://stackoverflow.com/questions/67903628

            QUESTION

            Prepending to a Scala Iterator -- timeout?
            Asked 2021-Jun-07 at 23:22

            I want to prepend a new iterator to my existing iterator.

            1. How can I prepend a new Iterator to an existing Iterator?

            2. Why does my code cause my REPL to hang?

            The following hangs indefinitely in my REPL:

            ...

            ANSWER

            Answered 2021-Jun-07 at 23:22

            Simply speaking, it hangs because you have there an infinite loop. In the line where you think you are merging iterators, you are actually referencing the new i (laziness) and not the initial value of i.

            You can get over that by introducing a new var as Luis Miguel pointed out

            Source https://stackoverflow.com/questions/67879401

            QUESTION

            SICP 3.52 delayed cdr
            Asked 2021-Jun-05 at 14:21

            ANSWER

            Answered 2021-Jun-05 at 14:21

            Community Discussions, Code Snippets contain sources that include Stack Exchange Network

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