Karthik Subramanian created SPARK-38234:
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Summary: Provide monitoring REST API for Structured Streaming
Key: SPARK-38234
URL: https://issues.apache.org/jira/browse/SPARK-38234
Project: Spark
Issue Type: Improvement
Components: Structured Streaming
Affects Versions: 3.2.0, 3.1.2
Reporter: Karthik Subramanian
Fix For: 3.3.0, 3.1.4, 3.2.2
In [SPARK-31953], Structured Streaming is added to the history server and a
"Structured Streaming" tab appears in the history UI when a streaming query is
present. However, even though a store exists for it and the data is presented
in the UI, this data is not exposed as a REST API. This data can be used for
monitoring, detecting streaming and to build custom dashboards. This monitoring
API will be similar to the monitoring APIs that are present for DStreams -
refer SPARK-18470.
In this change, we plan to add two simple APIs that expose the data in the
store and can be used to monitor streaming queries.
h3. *Summary API*
To list the summary of all existing streaming queries.
GET {{/\{appId}/sql/streamingqueries}}
Response is list of {_}StreamingQueryData{_}.
h3. *Progress API*
To list the progress events of a specific streaming query by {_}runId{_}.
User can also specify how many of the most recent events needs to be retrieved
by using the _last_ query parameter. By default, we can return the most recent
progress event i.e. last is set to 1.
GET {{/\{appId}/sql/streamingqueries/\{runId}/progress?last=\{N}}}
Response is list of {_}StreamingQueryProgress{_}.
*Note:* We are not introducing new objects for the response since we are just
returning the data from the store without aggregation, these are existing event
structures.
Will attach sample I/O.
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