[ https://issues.apache.org/jira/browse/SPARK-19932?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Liwei Lin updated SPARK-19932: ------------------------------ Summary: Disallow a case that might case OOM for steaming deduplication (was: Also save event time into StateStore for certain cases) > Disallow a case that might case OOM for steaming deduplication > -------------------------------------------------------------- > > Key: SPARK-19932 > URL: https://issues.apache.org/jira/browse/SPARK-19932 > Project: Spark > Issue Type: Improvement > Components: Structured Streaming > Affects Versions: 2.1.0 > Reporter: Liwei Lin > > {code} > spark > .readStream // schema: (word, eventTime), like ("a", 10), > ("a", 11), ("b", 12) ... > ... > .withWatermark("eventTime", "10 seconds") > .dropDuplicates("word") // note: "eventTime" is not part of the key > columns > ... > {code} > As shown above, right now if watermark is specified for a streaming > dropDuplicates query, but not specified as the key columns, then we'll still > get the correct answer, but the state just keeps growing and will never get > cleaned up. > The reason is, the watermark attribute is not part of the key of the state > store in this case. We're not saving event time information in the state > store. -- This message was sent by Atlassian JIRA (v6.3.15#6346) --------------------------------------------------------------------- To unsubscribe, e-mail: issues-unsubscr...@spark.apache.org For additional commands, e-mail: issues-h...@spark.apache.org