Questions tagged [ignite]

Apache Ignite™ is a memory-centric distributed database, caching, and processing platform for transactional, analytical, and streaming workloads delivering in-memory speeds at petabyte scale. It provides high-performance, in-memory computing capabilities for large data sets.

What is Apache Ignite for?

Apache Ignite provides a framework for in-memory computing operations on large scale data sets. It supports the following features:

  • Memory-centric, strongly consistent, distributed storage
  • Distributed SQL - supports ANSI SQL in-memory and on-disk transactional database
  • Distributed Key-Value - supports in-memory and on-disk key-value transactional data grid
  • In-Memory Compute grid - supports collocated computations and executor services
  • In-Memory Service grid - supports clusters and compute contracts
  • In-Memory Streaming - supports data streaming services like Kafka
  • In-Memory File system - supports the IGFS (Ignite filesystem)

Apache Ignite architecture combines the performance and scale of in-memory computing together with the disk durability and strong consistency in one system. When native persistence is turned on, Ignite functions as a memory-centric system-of-record, where most of the processing happens in memory on cached data, but the superset of data and indexes gets persisted to disk.

When persistence is turned off, Ignite functions as a memory-only store, in which case it can be treated as a Distributed Cache, In-Memory Database (IMDB) or In-Memory Data Grid (IMDG).

Resources

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Apache Ignite: How to cache an entry with multiple keys

Is there any way to cache one entry against two keys in apache ignite? say for eg: I need to cache users, based on their user id and their username, so I can get it back in both ways. Which is the best way to achieve this?
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Apache Ignite: What is best practice to fire/emit user defined events in Java?

I want to emit a user defined Ignite event but haven't found any examples or implementations other than the Ignite sources, which uses non-API methods. Can someone explain how to do this? TIA
ttuna
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how to remove apache ignite cache configuration template

I have created a cache configuration template as per below code IgniteConfiguration igniteCfg = new IgniteConfiguration(); try (Ignite ignite = Ignition.start(igniteCfg)) { CacheConfiguration cacheCfg = new…
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Why Ignite Connector throws IgniteCheckedException for reconnection for affinity nodes?

My kafka-ignite connector suddenly stopped because the Ignite server got restarted. And when I restart my connector it is throwing same error regarding affinity node for particular data. It is not getting node details for a particular partition.…
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Apache ignite stop working after a while on ubuntu

My application is on the .net core platform and uses apache ignite inside itself. everything works truly on windows, but on ubuntu, the application stops working after a while. I attached the log files. log 01 log 02
MasiumDev
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How to implement consumer-producer on apache ignite queue?

I know that ignite cache does provide a continuous query function to allow event trigger function. But what about the ignite queue? How could we implement a producer-consumer model upon the ignite queue? For example, producer put object in the…
Jiayu
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How to query a column with arraylist

I have a SQL database and one column of that database is a short array. Column name Data type Order Id Integer Timestamp Long Activity Short [] I want to query this table and get a count of rows that include a given short value in…
sachith
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Using Ignite TcpDiscoveryKubernetesIpFinder in a purely IPv6 environment

Are there any know issues with running the org.apache.ignite.spi.discovery.tcp.ipfinder.kubernetes.TcpDiscoveryKubernetesIpFinder a purely IPv6 environment? I looked here and it mentions there may be issues with clusters becoming detached but does…
RichardFeynman
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Cache MySQL DB with Apache Ignite

I have some application written in JAVA. We are using MySQL DB. It is possible to integrate that MySQL DB with Apache Ignite as In Memory cache and use that configuration without any updates in JAVA application (of course some DB connection details…
Robert
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shutdown Apache Ignite gracefully

I am having Apache ignite in Linux server and looking for a graceful shutdown of the ignite server. Currently I am doing grep and killing the process, but looking for command so that I can make a script. ./ignite.sh…
Victor
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Ignite-code2.10.0Failed to find empty constructor for class: org.apache.ignite.internal.processors.platform.websession.PlatformDotNetSessionLockResult

I am facing some issue with setting up apache ignite-core 2.10.0 in java 11 environment. I am getting the below exception, when I am trying to start ignite Using Ignition start method. {"version": "0.2.0", "timestamp": "2021-08-18T08:08:51.363Z",…
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Apache Ignite Scan Query is not working in .net

I'm using Apache Ignite on Azure Kubernetes service. I need to get the registered devices list from Ignite in lately. But the scan query is not working. Here is my device object; public class Device { [Required] public string Id { get; set; } …
OguzKaanAkyalcin
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How to use SQL UNION with three separate Ignite Caches

I was having a ignite cache and doing sql queries as follows. IgniteCache cache = ignite.cache(CACHE_NAME); private static final String sql = "Select timestamp from cache1 where orderId = ? and timestamp <= ? and timestamp >= ?…
sachith
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Set proper cluster name to GridGain web console

I am using two Gridgain clusters in Kubrenetes and they manage and monitor using single web console free version. Both clusters connected properly and working as I expected. But cluster name automatically generated and haven't any sense to identify…
Nuwan Sameera
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Migration from apache ignite 2.7.0 to 2.10.0

Planning to migrate from apache ignite 2.7.0 to apache ignite 2.10.0. Is there any guide/blog/way to migrate without losing any data? Appreciate your help.
Ankit Jindal
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