DataFlow | Optical flow code with several data cost functions
kandi X-RAY | DataFlow Summary
kandi X-RAY | DataFlow Summary
ABOUT: This software implements our approach to optical flow estimation [1] with several data cost functions. The additional and optional library - Eigen is not included.
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QUESTION
Latest Update (with an image to hope simplify the problem) (thanks for feedback from @Mahmoud)
Relate issue reports for other reference (after this original post created, it seem someone filed issues for Spring Cloud on similar issue, so also update there too):
https://github.com/spring-cloud/spring-cloud-task/issues/793 relate to approach #1
https://github.com/spring-cloud/spring-cloud-task/issues/792 relate to approach #2
Also find a workaround resolution for that issue and update on that github issue, will update this once it is confirmed good by developer https://github.com/spring-cloud/spring-cloud-task/issues/793#issuecomment-894617929
I am developing an application involved multi-steps using spring batch job but hit some roadblock. Did try to research doc and different attempts, but no success. So thought to check if community can shed light
Spring batch job 1 (received job parameter for setting for step 1/setting for step 2)
...ANSWER
Answered 2021-Aug-15 at 13:33
- Is above even possible setup?
yes, nothing prevents you from having two partitioned steps in a single Spring Batch job.
- Is it possible to use JobScope/StepScope to pass info to the partitionhandler
yes, it is possible for the partition handler to be declared as a job/step scoped bean if it needs the late-binding feature to be configured.
Updated on 08/14/2021 by @DanilKo
The original answer is correct in high - level. However, to actually achieve the partition handeler to be step scoped, a code modification is required
Below is the analyze + my proposed workaround/fix (maybe eventually code maintainer will have better way to make it work, but so far below fix is working for me)
Issue being continued to discuss at: https://github.com/spring-cloud/spring-cloud-task/issues/793 (multiple partitioner handler discussion) https://github.com/spring-cloud/spring-cloud-task/issues/792 (which this fix is based up to use partitionerhandler at step scope to configure different worker steps + resources + max worker)
Root cause analyze (hypothesis)The problem is DeployerPartitionHandler utilize annoation @BeforeTask to force task to pass in TaskExecution object as part of Task setup
But as this partionerHandler is now at @StepScope (instead of directly at @Bean level with @Enable Task) or there are two partitionHandler, that setup is no longer triggered, as @EnableTask
seem not able to locate one partitionhandler
during creation.
Resulted created DeployerHandler faced a null with taskExecution
when trying to launch (as it is never setup)
Below is essentially a workaround to use the current job execution id to retrieve the associated task execution id From there, got that task execution and passed to deploy handler to fulfill its need of taskExecution reference It seem to work, but still not clear if there is other side effect (so far during test not found any)
Full code can be found in https://github.com/danilko/spring-batch-remote-k8s-paritition-example/tree/attempt_2_partitionhandler_with_stepscope_workaround_resolution
In the partitionHandler method
QUESTION
I've created TPL Dataflow pipeline as shown below
...ANSWER
Answered 2022-Mar-07 at 18:41If any one looking for the solution. I think the error happens when multiple threads are working together we solved it in a way instead of returning Task Process we changed the method to.
QUESTION
I installed ubuntu server VM on Azure there I installed couchbase community edition on now i need to access the couchbase using dotnet SDK but code gives me bucket not found or unreachable error. even i try configuring a public dns and gave it as ip during cluster creation but still its giving the same. even i added public dns to the host file like below 127.0.0.1 public dns The SDK log includes below 2 statements Attempted bootstrapping on endpoint "name.eastus.cloudapp.azure.com" has failed. (e80489ed) A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond.
SDK Doctor Log:
...ANSWER
Answered 2022-Feb-11 at 17:23Thank you for providing so much detailed information! I suspect the immediate issue is that you are trying to connect using TLS, which is not supported by Couchbase Community Edition (at least not as of February 2022). Ports 11207 and 18091 are for TLS connections; as you observed in the lsof output, the server is not listening on those ports.
QUESTION
I'm using F# and have an AsyncSeq<'t>>
. Each item will take a varying amount of time to process and does I/O that's rate-limited.
I want to run all the operations in parallel and then pass them down the chain as an AsyncSeq<'t>
so I can perform further manipulations on them and ultimately AsyncSeq.fold
them into a final outcome.
The following AsyncSeq
operations almost meet my needs:
mapAsyncParallel
- does the parallelism, but it's unconstrained, (and I don't need the order preserved)iterAsyncParallelThrottled
- parallel and has a max degree of parallelism but doesn't let me return results (and I don't need the order preserved)
What I really need is like a mapAsyncParallelThrottled
. But, to be more precise, really the operation would be entitled mapAsyncParallelThrottledUnordered
.
Things I'm considering:
- use
mapAsyncParallel
but use aSemaphore
within the function to constrain the parallelism myself, which is probably not going to be optimal in terms of concurrency, and due to buffering the results to reorder them. - use
iterAsyncParallelThrottled
and do some ugly folding of the results into an accumulator as they arrive guarded by a lock kinda like this - but I don't need the ordering so it won't be optimal. - build what I need by enumerating the source and emitting results via
AsyncSeqSrc
like this. I'd probably have a set ofAsync.StartAsTask
tasks in flight and start more after eachTask.WaitAny
gives me something toAsyncSeqSrc.put
until I reach themaxDegreeOfParallelism
Surely I'm missing a simple answer and there's a better way?
Failing that, would love someone to sanity check my option 3 in either direction!
I'm open to using AsyncSeq.toAsyncEnum
and then use an IAsyncEnumerable
way of achieving the same outcome if that exists, though ideally without getting into TPL DataFlow or RX land if it can be avoided (I've done extensive SO searching for that without results...).
ANSWER
Answered 2022-Feb-10 at 10:35If I'm understanding your requirements then something like this will work. It effectively combines the iter unordered with a channel to allow a mapping instead.
QUESTION
I'm trying to load multiple files from a location into DB using Foreach Loop Container & DataFlow task in SSIS.
It's getting crashed while I try to execute the package. It's not giving any error message, whenever I execute the package it crashes and closes the visual studio app immediately. I have to kill the debug task in the task manager for the next execution of the package.
So I tried the below steps:
- I used a FileSystem task instead of DataFlow task to just move all the files from the source to the archive directory, which ran fine without any issues.
- Ran the DataFlow task individually to load a single file into DB, which was also executed successfully.
I couldn't figure out what was going wrong here. Any help would be appreciated! Thanks!
Screenshots
...ANSWER
Answered 2022-Feb-02 at 14:02All screenshots look fine to me. I will give some tips to try to figure out the issue.
Since the File System Task is executed without any problem, there is no problem with the ForEach Loop Container. You can try to remove the OLE DB Destination and replace it with a dummy task to check if it causing the issue. If the issue remains, it means that the Flat File Source could be the cause.
Things to try- Make sure that the
TargetServerVersion
is accurate. You can learn more about this property in the following article: How to change TargetServerVersion of my SSIS Project - Try running the package in 32-bit mode. You can do this by changing the
Run64bitRuntime
property toFalse
. You can learn more about this property in the following article: Run64bitRunTime debugging property - Running Visual Studio in safe mode. You can use the following command
devenv.exe /safemode
.
Since you are inserting flat files into the SQL database without performing any transformation. Why not use the SSIS Bulk Insert Task. You can refer to the following step-by-step guide for more information:
As mentioned in the official documentation, make sure that the following requirements are met:
- The server must have permission to access both the file and the destination database.
- The server runs the Bulk Insert task. Therefore, any format file that the task uses must be located on the server.
- The source file that the Bulk Insert task loads can be on the same server as the SQL Server database into which data is inserted, or on a remote server. If the file is on a remote server, you must specify the file name using the Universal Naming Convention (UNC) name in the path.
QUESTION
This is a React web app. When I run
...ANSWER
Answered 2021-Nov-13 at 18:36I am also stuck with the same problem because I installed the latest version of Node.js (v17.0.1).
Just go for node.js v14.18.1
and remove the latest version just use the stable version v14.18.1
QUESTION
We have a data pipeline built in Google Cloud Dataflow that consumes messages from a pubsub topic and streams them into BigQuery. In order to test that it works successfully we have some tests that run in a CI pipeline, these tests post messages onto the pubsub topic and verify that the messages are written to BigQuery successfully.
This is the code that posts to the pubsub topic:
...ANSWER
Answered 2022-Jan-27 at 17:18We had the same error. Finally solved it by using a JSON Web Token for authentication per Google's Quckstart. Like so:
QUESTION
I am following this tutorial on migrating data from an oracle database to a Cloud SQL PostreSQL instance.
I am using the Google Provided Streaming Template Datastream to PostgreSQL
At a high level this is what is expected:
- Datastream exports in Avro format backfill and changed data into the specified Cloud Bucket location from the source Oracle database
- This triggers the Dataflow job to pickup the Avro files from this cloud storage location and insert into PostgreSQL instance.
When the Avro files are uploaded into the Cloud Storage location, the job is indeed triggered but when I check the target PostgreSQL database the required data has not been populated.
When I check the job logs and worker logs, there are no error logs. When the job is triggered these are the logs that logged:
...ANSWER
Answered 2022-Jan-26 at 19:14This answer is accurate as of 19th January 2022.
Upon manual debug of this dataflow, I found that the issue is due to the dataflow job is looking for a schema with the exact same name as the value passed for the parameter databaseName
and there was no other input parameter for the job using which we could pass a schema name. Therefore for this job to work, the tables will have to be created/imported into a schema with the same name as the database.
However, as @Iñigo González said this dataflow is currently in Beta and seems to have some bugs as I ran into another issue as soon as this was resolved which required me having to change the source code of the dataflow template job itself and build a custom docker image for it.
QUESTION
We have Beam data pipeline running on GCP dataflow written using both Python and Java. In the beginning, we had some simple and straightforward python beam jobs that works very well. So most recently we decided to transform more java beam to python beam job. When we having more complicated job, especially the job requiring windowing in the beam, we noticed that there is a significant slowness in python job than java job which end up using more cpu and memory and cost much more.
some sample python code looks like:
...ANSWER
Answered 2022-Jan-21 at 21:31Yes, this is a very normal performance factor between Python and Java. In fact, for many programs the factor can be 10x or much more.
The details of the program can radically change the relative performance. Here are some things to consider:
- Profiling the Dataflow job (official docs)
- Profiling a Dataflow pipeline (medium blog)
- Profiling Apache Beam Python pipelines (another medium blog)
- Profiling Python (general Cloud Profiler docs)
- How can I profile a Python Dataflow job? (previous StackOverflow question on profiling Python job)
If you prefer Python for its concise syntax or library ecosystem, the approach to achieve speed is to use optimized C libraries or Cython for the core processing, for example using pandas/numpy/etc. If you use Beam's new Pandas-compatible dataframe API you will automatically get this benefit.
QUESTION
I'm currently building PoC Apache Beam pipeline in GCP Dataflow. In this case, I want to create streaming pipeline with main input from PubSub and side input from BigQuery and store processed data back to BigQuery.
Side pipeline code
...ANSWER
Answered 2022-Jan-12 at 13:12Here you have a working example:
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