[jira] [Commented] (PARQUET-1056) [C++] Add function to snapshot FileMetaData to a separate file, in case writing a row group fails, then prior row groups can be recovered

["Wes McKinney (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/PARQUET-1056?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16684392#comment-16684392 ] 

Wes McKinney commented on PARQUET-1056:
---------------------------------------

I just renamed the issue title. It's a fairly involved ask; if you would like to do the development work and make a PR, you can definitely go ahead

> [C++] Add function to snapshot FileMetaData to a separate file, in case writing a row group fails, then prior row groups can be recovered 
> ------------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: PARQUET-1056
>                 URL: https://issues.apache.org/jira/browse/PARQUET-1056
>             Project: Parquet
>          Issue Type: Wish
>          Components: parquet-cpp
>    Affects Versions: cpp-1.1.0
>            Reporter: yugu
>            Priority: Major
>
> questions are actually twofold:
> 1. is there a way to write data column by column ?
> I see a columnwriter but seems that's for arrow..
> 2. was wondering if there is a way to preserve the footer information once in a while, in case the process crashes. for now if the proc crash the parquet file become unreadable...
> In the code the close function (for parquetfilewriter) basically just flushes and close the stream. maybe a separate api for flush footer to target file?
> (or maybe there is an existing way for making things robust I missed)
> thanks!



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