REST API for GridGain
This chapter explains system requirements for running GridGain, including how to install GridGain, start a cluster, and run a simple Hello World example using GridGain’s REST API.
Since GridGain is built on top of Apache Ignite, GridGain reuses Ignite’s system properties, environment properties, startup scripts, etc. wherever possible.
Prerequisites
GridGain was officially tested on:
JDK |
Oracle JDK 8, 11 or 17, Open JDK 8, 11 or 17, IBM JDK 8, 11 or 17 |
OS |
Linux (any flavor), Mac OSX (10.6 and up), Windows (XP and up), Windows Server (2008 and up), Oracle Solaris, z/OS |
ISA |
x86, x64, SPARC, PowerPC |
Network |
No restrictions (10G recommended) |
Installing GridGain
GridGain is available in three editions: Community Edition (CE), Enterprise Edition (EE) and Ultimate Edition (UE). For this example, we’ll use the GridGain CE, which is distributed as binary, docker, and cloud images, and via RPM/DEB. This chapter explains how to install the GridGain CE binary distribution.
To get started with the GridGain CE binary distribution:
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Download the GridGain binary as a zip archive.
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Unzip the zip archive into the installation folder in your system.
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Move the
ignite-rest-httpfolder from{gridgain}/libs/optionalto{gridgain}/libsto enable the Ignite REST library for the cluster. The library is used by GridGain Web Console for cluster management and monitoring needs. -
(Optional) Enable required modules.
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(Optional) Set the
IGNITE_HOMEenvironment variable or Windows PATH to point to the installation folder and make sure there is no trailing/(or\for Windows) in the path.
Once that’s done, you will need to enable HTTP connectivity.
To do this, copy the ignite-rest-http module from {gridgain_dir}/libs/optional/ to the {gridgain_dir}/libs folder.
Starting a GridGain Node
Before connecting to GridGain via the REST API, you must start at least one GridGain cluster node.
You can start a GridGain node from the command line using the default configuration or by passing a custom configuration file. You can start as many nodes as you like and they will all automatically discover each other.
Navigate into the bin folder of GridGain installation directory from the command shell. Your command might look like this:
cd {gridgain}/bin/cd {gridgain}\bin\Start a node with a custom configuration file that is passed as a parameter to ignite.sh|bat like this:
./ignite.sh ../examples/config/example-ignite.xmlignite.bat ..\examples\config\example-ignite.xmlYou will see output similar to this:
[08:53:45] Ignite node started OK (id=7b30bc8e) [08:53:45] Topology snapshot [ver=1, locNode=7b30bc8e, servers=1, clients=0, state=ACTIVE, CPUs=4, offheap=1.6GB, heap=2.0GB]
Open another tab from your command shell and run the same command again:
./ignite.sh ../examples/config/example-ignite.xmlignite.bat ..\examples\config\example-ignite.xmlCheck the Topology snapshot line in the output.
Now you have a cluster of two server nodes with more CPUs and RAM available cluster-wide:
[08:54:34] Ignite node started OK (id=3a30b7a4) [08:54:34] Topology snapshot [ver=2, locNode=3a30b7a4, servers=2, clients=0, state=ACTIVE, CPUs=4, offheap=3.2GB, heap=4.0GB]
Running Your First GridGain Application
Once the cluster is started, you can use the GridGain REST API to perform cache operations.
You don’t need to explicitly configure anything because the connector is initialized automatically, listening on port 8080.
To verify the connector is ready, use curl:
curl "http://localhost:8080/ignite?cmd=version"You should see a message like this:
curl "http://localhost:8080/ignite?cmd=version"
{"successStatus":0,"error":null,"sessionToken":null,"response":"master"}You can see in the result that GridGain version is master.
Request parameters may be provided as either a part of URL or in a form data:
curl 'http://localhost:8080/ignite?cmd=put&cacheName=myCache' -X POST -H 'Content-Type: application/x-www-form-urlencoded' -d 'key=testKey&val=testValue'Assuming that the server node is running locally, here is a simple example that creates a cache (myCache) and then puts and gets the string "Hello_World!" from the cache via the REST API:
Create a cache:
curl "http://localhost:8080/ignite?cmd=getorcreate&cacheName=myCache"Put data into the cache. The default type is "string" but you can specify a data type via the keyType parameter.
curl "http://localhost:8080/ignite?cmd=put&key=1&val="Hello_World!"&cacheName=myCache"Get the data from the cache
curl "http://localhost:8080/ignite?cmd=get&key=1&cacheName=myCache"Now that you’ve seen a very basic example of accessing GridGain clusters via the REST API, you should probably keep the following in mind:
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This is a very basic example. You will want to read more on the REST API here. That page includes a listing of the various API calls and also covers important subjects like Authentication.
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The REST interface may not be suitable for all tasks. For example, you should use one of the language clients instead if you’re trying to load bulk data, or perform mission critical tasks with millisecond latency.
Next Steps
From here, you may want to:
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Read more about using GridGain
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Use GridGain Control Center to monitor your cluster
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