Tian Jiang created IOTDB-1423:
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Summary: Support query canceling
Key: IOTDB-1423
URL: https://issues.apache.org/jira/browse/IOTDB-1423
Project: Apache IoTDB
Issue Type: Improvement
Components: Core/Engine
Reporter: Tian Jiang
When an ongoing query is aborted by closing the corresponding dataset,
statement, or connection, the query remains to progress in the background. So
if several resource-consuming queries time out, their resources are still held
for a long time, resulting in a low resource status of the system.
So a query should be able to be canceled. This does not only serve the timeout
purpose, a user may also cancel a query if he/she finds out that the query is
wrong or not meaningful anymore. Canceling a query needs to accomplish the
following: first, the background threads of the query must all be interrupted;
second, all claimed resources should be released; finally, the query context
and dataset should be properly removed.
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