| # Apache Ignite SQL Engine API module |
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| The module contains an internal API that is used for integration with other components. |
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| ## Operation Kill Handler API |
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| ### Motivation |
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| We have at least three types of operations that can be interrupted using the SQL KILL command: |
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| * SQL query |
| * Transaction |
| * Compute job |
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| The Kill Handler API is designed to simplify the integration of the SQL KILL command |
| with components that are responsible for canceling an operation of a certain type. |
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| ### Classes description |
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| [OperationKillHandler](src/main/java/org/apache/ignite/internal/sql/engine/api/kill/OperationKillHandler.java) - |
| handler that can abort an operation of a certain type. It needs to be |
| implemented by the component that wants to handle the KILL command. |
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| [KillHandlerRegistry](src/main/java/org/apache/ignite/internal/sql/engine/api/kill/KillHandlerRegistry.java) - |
| registry of all kill handlers. All handlers must be registered during node startup. |
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| [CancellableOperationType](src/main/java/org/apache/ignite/internal/sql/engine/api/kill/CancellableOperationType.java) - |
| enumeration of operations that can be cancelled. |
