Revision d7b268ab3264b892c4477cf8af30fb78c2694748 authored by herman on 03 December 2019, 10:25:49 UTC, committed by herman on 03 December 2019, 10:25:49 UTC
### What changes were proposed in this pull request? Observable metrics are named arbitrary aggregate functions that can be defined on a query (Dataframe). As soon as the execution of a Dataframe reaches a completion point (e.g. finishes batch query or reaches streaming epoch) a named event is emitted that contains the metrics for the data processed since the last completion point. A user can observe these metrics by attaching a listener to spark session, it depends on the execution mode which listener to attach: - Batch: `QueryExecutionListener`. This will be called when the query completes. A user can access the metrics by using the `QueryExecution.observedMetrics` map. - (Micro-batch) Streaming: `StreamingQueryListener`. This will be called when the streaming query completes an epoch. A user can access the metrics by using the `StreamingQueryProgress.observedMetrics` map. Please note that we currently do not support continuous execution streaming. ### Why are the changes needed? This enabled observable metrics. ### Does this PR introduce any user-facing change? Yes. It adds the `observe` method to `Dataset`. ### How was this patch tested? - Added unit tests for the `CollectMetrics` logical node to the `AnalysisSuite`. - Added unit tests for `StreamingProgress` JSON serialization to the `StreamingQueryStatusAndProgressSuite`. - Added integration tests for streaming to the `StreamingQueryListenerSuite`. - Added integration tests for batch to the `DataFrameCallbackSuite`. Closes #26127 from hvanhovell/SPARK-29348. Authored-by: herman <herman@databricks.com> Signed-off-by: herman <herman@databricks.com>
1 parent 075ae1e
LICENSE-sorttable.js.txt
Copyright (c) 1997-2007 Stuart Langridge
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
![swh spinner](/static/img/swh-spinner.gif)
Computing file changes ...