[jira] [Commented] (FLINK-20221) DelimitedInputFormat does not restore compressed filesplits correctly leading to dataloss

["Xintong Song (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FLINK-20221?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17235133#comment-17235133 ] 

Xintong Song commented on FLINK-20221:
--------------------------------------

[~gyfora], thanks for reporting the issue.

I'm not familiar with the problem, and may have not fully understand the problem. However, I think any issue that may lead to data loss should be considered as a release blocker.

Tagged the fix versions so that this issue shows in the release kanban boards.

> 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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