[jira] [Commented] (FLINK-13097) Buffer depletion in SimpleCollectingOutputView throws non-obvious EOFException

["Cyrille Chépélov (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FLINK-13097?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16878428#comment-16878428 ] 

Cyrille Chépélov commented on FLINK-13097:
------------------------------------------

PR at https://github.com/apache/flink/pull/8981

> Buffer depletion in SimpleCollectingOutputView throws non-obvious EOFException 
> -------------------------------------------------------------------------------
>
>                 Key: FLINK-13097
>                 URL: https://issues.apache.org/jira/browse/FLINK-13097
>             Project: Flink
>          Issue Type: Improvement
>    Affects Versions: 1.7.2, 1.8.0
>         Environment: SCIO + BEAM + Flink under scala 2.12, java 8
>            Reporter: Cyrille Chépélov
>            Priority: Trivial
>              Labels: pull-request-available
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> When SimpleCollectingOutputView is used, records are collected into a pre-allocated MemorySegmentSource. 
> In case of depletion, the SimpleCollectingOutputView#nextSegment method throws EOFException without a message.
> This can be non-obvious to diagnose as a newcomer, as 
> * the Java SDK documentation strongly suggests EOFException is related to an inability to read further (whereas in this context, the exception materializes an inability to _write_ further)
> * awareness than pre-allocated, fixed-size buffers are in play may not necessarily be expected of a newcomer to flink.



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