Mikhail Pochatkin created IGNITE-19517:
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Summary: Add class resolution mechinism to compute
Key: IGNITE-19517
URL: https://issues.apache.org/jira/browse/IGNITE-19517
Project: Ignite
Issue Type: New Feature
Reporter: Mikhail Pochatkin
h4. Regular behavior
As soon as code execution is initiated due to invocation one of the methods
execute, executeColocated or broadcast the following steps must be performed:
# Get a class loader which is identified by an array of DeploymentUnit
instances passed to the called method.
# If the class loader doesn’t exist yet, then create it:
# For each deployment unit check that it is deployed:
# If the deployment unit is deployed and can be used for code execution then
use its location for class loading
# If the deployment unit is deployed to the cluster but is not deployed to the
node then initiate deployment on-demand.
# If the deployment unit doesn’t exist, throw ClassNotFoundException with
_“<class_fqdn>. Deployment unit <deployment_unit_id_and ver> doesn’t exist”_
message, where _<deployment_unit_id_and_ver>_ is a concatenation of ID and
version (e.g. com.example:1.0.0)
# Check that deployment unit can be used for code execution:
# If the deployment unit exists but can’t be used for code execution, throw
ClassNotFoundException with _“<class_fqdn>. Deployment unit
<deployment_unit_id> can’t be used: [clusterStatus = <clusterDURecord.status>,
nodeStatus = <nodeDURecord.status>]”_ message.
# Load a class of task/job passed to the Compute API method as parameter. At
this point ClassNotFoundException could be thrown from the class loader.
# Execute required code.
In order to have the possibility to detect that some code is in progress and
uses some class loader a reference counter could be used. The counter must be
incremented when job execution is started and decremented when code execution
is finished.
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