[ https://issues.apache.org/jira/browse/SPARK-21145?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Apache Spark reassigned SPARK-21145: ------------------------------------ Assignee: Apache Spark (was: Tathagata Das) > Restarted queries reuse same StateStoreProvider, causing multiple concurrent > tasks to update same StateStore > ------------------------------------------------------------------------------------------------------------ > > Key: SPARK-21145 > URL: https://issues.apache.org/jira/browse/SPARK-21145 > Project: Spark > Issue Type: Bug > Components: Structured Streaming > Affects Versions: 2.2.0 > Reporter: Tathagata Das > Assignee: Apache Spark > > StateStoreProvider instances are loaded on-demand in a executor when a query > is started. When a query is restarted, the loaded provider instance will get > reused. Now, there is a non-trivial chance, that the task of the previous > query run is still running, while the tasks of the restarted run has started. > So for a stateful partition, there may be two concurrent tasks related to the > same stateful partition, and there for using the same provider instance. This > can lead to inconsistent results and possibly random failures, as state store > implementations are not designed to be thread-safe. -- This message was sent by Atlassian JIRA (v6.4.14#64029) --------------------------------------------------------------------- To unsubscribe, e-mail: issues-unsubscr...@spark.apache.org For additional commands, e-mail: issues-h...@spark.apache.org