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https://issues.apache.org/jira/browse/FLINK-20221?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17237161#comment-17237161
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Dian Fu commented on FLINK-20221:
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I'm also in favor of downgrading the priority to Critical and trying to fix
this issue on a best effort basis.
> DelimitedInputFormat does not restore compressed filesplits correctly leading
> to dataloss
> -----------------------------------------------------------------------------------------
>
> Key: FLINK-20221
> URL: https://issues.apache.org/jira/browse/FLINK-20221
> Project: Flink
> Issue Type: Bug
> Components: Connectors / FileSystem
> Affects Versions: 1.10.2, 1.12.0, 1.11.2
> Reporter: Gyula Fora
> Assignee: Gyula Fora
> Priority: Blocker
> Fix For: 1.12.0, 1.10.3, 1.11.3
>
>
> It seems that the delimited input format cannot correctly restore input
> splits if they belong to compressed files. Basically when a compressed
> filesplit is restored in the middle, it won't read it anymore leading to
> dataloss.
> The cause of the problem is that for compressed splits that use an inflater
> stream, the splitlength is set to the magic number -1 which is ignored in the
> reopen method and causes the split to go to `end` state immediately.
> The problem and the fix is shown in this commit:
> [https://github.com/gyfora/flink/commit/4adc8ba8d1989fff2db43881c9cb3799848c6e0d]
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