batch-processing | 易学教程

Running a background Java program in Tomcat [duplicate]

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This question already has an answer here: How to run a background task in a servlet based web application? 5 answers Can anyone advise here? I have a situation where users will submit data mining requests interactively via a Java JSP and servlet to an application of mine which will dynamically work out association rules on data and more. As such a job may take a while, I'm thinking of some sort of process on the server to run such a request in the background so it dosen't 'lock' the session and possibly use massive amounts of server memory to the detriment of the system. As the system is made

SAPUI5 - Batch Operations - how to do it right?

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问题 I got multiple EntititySets which I want to update in my SAP Backend, therefore I fetch my data (payload) as JSON and put it in a request (its successfully in the node "data"): Code: var oTreeJSON = oTreeTable.getModel().getProperty("/root"); var oModel = sap.ui.getCore().getModel(); var batchChanges = []; for (var i = 0; i < oTreeAll.length; i++) { batchChanges.push(oModel.createBatchOperation("/sap/opu/odata/sap/MY_SERVICE/?$batch", "POST", oTreeAll[i])); } oModel.submitBatch(); My Request

Log4j: One log file per request

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问题 We have a weblogic batch application which processes multiple requests from consumers at the same time. We use log4j for logging puposes. Right now we log into a single log file for multiple requests. It becomes tedious to debug an issue for a given request as for all requests the logs are in a single file. So plan is to have one log file per request. The consumer sends a request ID for which processing has to be performed. Now, in reality there could be multiple consumers sending the request

getting process ID of exe running in Bat File

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问题 I require the Process id of the "Las2xyz" process that's being run in my bat file. How can i achieve this? I can't use the last RUN ID or the first ID, I need the actual process ID, as there are multiple of these running at any given time and ending at any given time i cannot guessimate it. this is my batch: @echo off @echo off set PATH=C:\Windows\system32;C:\atlass\las2xyz;C:\atlass\las2xyz\bin;C:\atlass\las2xyz\lib set TOP_HOME=%C:\atlass\las2xyz% del dat*.xyz dat*.seg dat*.pat dat*.tmp dat

Java 8 Stream with batch processing

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I have a large file that contains a list of items. I would like to create a batch of items, make an HTTP request with this batch (all of the items are needed as parameters in the HTTP request). I can do it very easily with a for loop, but as Java 8 lover, I want to try writing this with Java 8's Stream framework (and reap the benefits of lazy processing). Example: List<String> batch = new ArrayList<>(BATCH_SIZE); for (int i = 0; i < data.size(); i++) { batch.add(data.get(i)); if (batch.size() == BATCH_SIZE) process(batch); } if (batch.size() > 0) process(batch); I want to do something a long

How to implement batch fetching with Fluent NHibernate when working with Oracle?

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I've tried using Future feature with Oracle but NHibernate does not support it. I've read some about Batch Fetching feature: http://docs.huihoo.com/hibernate/nhibernate-reference-1.2.0/performance.html How could I use it with Fluent NHibernate? how should it be configured? Radim Köhler To give you the answer how to use batching with fluent: 1) on the colleciton HasMany<MyEntity>(x => x.Entities) .BatchSize(100); 2) on a class level public MyEntityMap() { Id(x => x.... ... BatchSize(100); This corresponds with the 19.1.5. Using batch fetching 来源： https://stackoverflow.com/questions/20995583/how

Using StatelessSession for Batch processing

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问题 From documentation If we have a case where we need to insert 1000 000 rows/objects: Session session = sessionFactory.openSession(); Transaction tx = session.beginTransaction(); for ( int i=0; i<100000; i++ ) { Customer customer = new Customer(.....); session.save(customer); if ( i % 20 == 0 ) { //20, same as the JDBC batch size //flush a batch of inserts and release memory: session.flush(); session.clear(); } } tx.commit(); session.close(); Why we should use that approach? What kind of

Training broke with ResourceExausted error

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问题 I am new to tensorflow and Machine Learning. Recently I am working on a model. My model is like below, Character level Embedding Vector -> Embedding lookup -> LSTM1 Word level Embedding Vector->Embedding lookup -> LSTM2 [LSTM1+LSTM2] -> single layer MLP-> softmax layer [LSTM1+LSTM2] -> Single layer MLP-> WGAN discriminator Code of he rnn model while I'm working on this model I got the following error. I thought My batch is too big. Thus I tried to reduce the batch size from 20 to 10 but it

No matter what, I can't batch MySQL INSERT statements in Hibernate

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问题 I'm currently facing the well-known and common Hibernate insert batch problem. I need to save batches 5 millions of rows long. I'm first trying with a much lighter payload. Since I have to insert entities of only 2 types (first all records of type A, then all records of type B, all pointing to common type C ManyToOne parent), I would like to take the most advantage from JDBC batch insert. I have already read lots of documentation, but none that I have tried worked. I know that in order to use

Batch update/delete EF5

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What is the best way to deal with batch updates using (Entity Framework) EF5? I have 2 particular cases I'm interested in: Updating a field (e.g. UpdateDate) for a list (List) of between 100 and 100.000 Id's, which the primary key. Calling each update separately seem to be to much overhead and takes a long time. Inserting many, also between the 100 and 100.000, of the same objects (e.g. Users) in a single go. Any good advice? There are two open source projects allowing this: EntityFramework.Extended and Entity Framework Extensions . You can also check discussion about bulk updates on EF's