Tag: WebDev

I am experimenting with GridDB for an IoT application where sensors continuously send temperature and humidity readings. Each record contains a timestamp and the measurements. The container is defined in my Java application like this: class SensorData { @RowKey Timestamp timestamp; double temperature; double humidity; } Sensor data is inserted continuously using the Java API: Container<String, SensorData> container = store.getContainer("sensor_data"); SensorData row = new SensorData(); row.timestamp = new Timestamp(System.currentTimeMillis()); row.temperature = 22.5; row.humidity = 60; container.put(row); Because the system stores continuous sensor readings, the dataset will grow very quickly over time. In the production environment we only need to keep the last 30 days of data,

I have a do data migration using spring batching And created a processor of 10 steps in which first 3 steps are api calls that create the new txn in the system with the data from the source But if the rollback took place after that i whole process starts from stage 1 leading duplication of the transaction and api is not idempotent Please help how can i overcome this problem

I am investigating a performance bottleneck in a C++ application using RocksDB v8.5.x. We are seeing extreme P99.9 latency spikes (up to 500ms) specifically during the Write-Ahead Log (WAL) flush and sync operations, even though the underlying NVMe RAID-0 array reports low utilization (~15%). From a development perspective, I’ve narrowed it down to rocksdb::WritableFileWriter::Sync or fflush calls, but I am struggling to understand why the WAL write path is stalling when the device bandwidth and IOPS are nowhere near their limits. The Setup & Configuration RocksDB Options: sync=true (for critical write paths) use_direct_io_for_flush_and_compaction = true wal_bytes_per_sync = 0 (default) Environment: Ubuntu 22.04 (Kernel 5.15), ext4 (noatime, data=ordered). Storage: RAID-0 Samsung 980 Pro NVMe.

I'm trying to start a live share session in VS 2026 to collaborate on a C++ project with my classmates, but I keep getting the same error message: "Failed to create a collaboration session. Agent activation failed." It only shows up when I hit Start a Session. However, I haven't gotten a chance to go any further than the Invite Link window when choosing the Join a Session option. After quite a few hours of trial and fail, I've narrowed down the location of the error: specifically the User Account setting under Tools > Options > Live Share > General > Authentication. It is currently set to Personalization Account, creating an error window saying "Agent activation failed" when I try to change it. All the forums I can find are a minimum of 3 years old, where only one seems to mention a similar problem as me with no clear solution:

I am working on a university project using Node.js, TypeScript, and Sequelize. I've implemented a Repository layer to decouple my database logic from the Service layer. Initially, my repository was very clean: static async create (payload: EstateInput): Promise<EstateOutput> { const estate = await Estate.create(payload); return estate; } Now, the requirements have grown. When creating an Estate, I need to handle several associations simultaneously: Address: 1:1 association (nested creation). Amenities: N:M association (linking existing IDs or creating new ones). Photos: 1:M association (multiple uploads). If I move this logic to the Service Layer, the service starts "knowing" too much about Sequelize internals (like transaction, include, o

Suppose a node with label grafana-map= and my container requires environment variable key INSTANCE= I expect kind like this... - name: INSTANCE valueFrom: fieldRef: fieldPath: spec.nodeName.grafana-map.value

I have installed hadoop-3.4.2 and hive-4.1.0. Hive is configured to store tables at /user/hive/warehouse, using Beeline I was able to create several tables. Now I'm trying to create Iceberg table with the following statement: CREATE TABLE x (i int) STORED BY ICEBERG; The x directory is created on HDFS (without Iceberg files) but I'm getting the following error: 0: jdbc:hive2://localhost:10000> CREATE TABLE x (i int) STORED BY ICEBERG; INFO : Compiling command(queryId=spark_20260313010955_97c79a9f-5d00-4879-bbd4-2ab19d4bc6fe): CREATE TABLE x (i int) STORED BY ICEBERG INFO : Semantic Analysis Completed (retrial = false) INFO : Created Hive schema: Schema(fieldSchemas:null, properties:null) INFO : Completed compiling command(queryId=spark_20260313010955_97c79a9f-5d00-4879-bbd4-2ab19d4bc6fe); Time taken: 1.574 seconds INFO : Concurrency mode is disabled, not creating a lock manager INFO : Executing command(queryId=spark_2026

I’m working with a Vision Transformer (ViT) backbone from Keras Hub and building my own classification head. My code looks like this: python def get_vit_model(model_variant='vit_base', input_shape=(256, 256, 3), num_classes=3, train_base_model=True): preset_path = "/home/ahmed/ct_brain_project/models" back_bone = keras_hub.models.Backbone.from_preset(preset_path) back_bone.trainable = train_base_model inputs = layers.Input(shape=input_shape, name='input_layer') features = back_bone(inputs, training=train_base_model) # Extract CLS token cls_token = features[:, 0, :] # (batch, embed_dim) x = layers.Dense(128, use_bias=False)(cls_token) # rest of code of the classification head model = Model(inputs=inputs, outputs=outputs) return model From the config I downloaded (vit_base_patch16_224_imagenet from

Building my program on gcc (some old version), I got: narrowing conversion of '(schemaName.std::__cxx11::basic_string<wchar_t>::length()+ 2)' from 'std::__cxx11::basic_string<wchar_t>::size_type' {aka 'long unsigned int'} to 'int'[-Wnarrowing] How to fix it? Or I should just silence it? This is the line in question: int length1[2] = { schemaName.length() + 2, tableName.length() + 2 }; length1 array will be passed to PQprepare: https://www.postgresql.org/docs/current/libpq-exec.html, which is looking for an int[]. P..S.: Is there a way to turn this on on MSVC 2017?

The goal of this project is to build a user authentication system (Web Login) capable of self-protection against brute force attacks by combining technical measures such as rate limiting, account locking, and traffic monitoring. So, as the title says, because of being a students in a college, I'm wondering what entities for it, I hope I can see your point of view and your experience for this problem. Also it is not a homework, I'm doing it for experience and skills. Thanks for your help!