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From "Liangchang Zhu (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (SPARK-24404) Increase currentEpoch when meet a EpochMarker in ContinuousQueuedDataReader.next() in CP mode based on PR #21353 #21332 #21293 and the latest master
Date Fri, 01 Feb 2019 06:04:00 GMT

     [ https://issues.apache.org/jira/browse/SPARK-24404?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Liangchang Zhu resolved SPARK-24404.
------------------------------------
    Resolution: Won't Fix

> Increase currentEpoch when meet a EpochMarker in ContinuousQueuedDataReader.next()  in
CP mode based  on PR #21353 #21332 #21293 and the latest master
> ------------------------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: SPARK-24404
>                 URL: https://issues.apache.org/jira/browse/SPARK-24404
>             Project: Spark
>          Issue Type: Bug
>          Components: Structured Streaming
>    Affects Versions: 2.3.0
>            Reporter: Liangchang Zhu
>            Priority: Major
>
> In CP mode,  based on PR #21353 #21332 #21293 and the latest master ContinuousQueuedDataReader.next()
will be invoked by ContinuousDataSourceRDD.compute to return UnsafeRow. When currentEntry
polled from ArrayBlockingQueue is a EpochMarker, ContinuousQueuedDataReader will send `ReportPartitionOffset`
message to epochCoordinator with currentEpoch of EpochTracker. The currentEpoch is a ThreadLocal
variable, but now no place invoke `incrementCurrentEpoch` to increase currentEpoch in its
thread, so `getCurrentEpoch` will return `None` all the time(because currentEpoch is -1).
This will cause exception when invoke `None.get`. At the same time, in order to make the `ReportPartitionOffset`
have correct semantics, we need increase currentEpoch before send this message 



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