You are viewing a plain text version of this content. The canonical link for it is here.
Posted to commits@hudi.apache.org by GitBox <gi...@apache.org> on 2019/12/26 09:12:28 UTC

[GitHub] [incubator-hudi] cdmikechen opened a new issue #1140: A suggestion that supporting a querying delete data methond in incremental view

cdmikechen opened a new issue #1140: A suggestion that supporting a querying delete data methond in incremental view
URL: https://github.com/apache/incubator-hudi/issues/1140
 
 
   As we known, hudi have supported many method to query data in Spark and Hive and Presto. And it also provides a very good timeline idea to trace changes in data, and it can be used to query incremental data in incremental view.
   In old time, we just have insert and update funciton to upsert data, and now we have added new functions to delete some existing data.
   
   **[HUDI-328] Adding delete api to HoodieWriteClient**   https://github.com/apache/incubator-hudi/pull/1004
   **[HUDI-377] Adding Delete() support to DeltaStreamer**   https://github.com/apache/incubator-hudi/pull/1073
   
   So I think if we have delete api, should we add another method to get deleted data in incremental view?
   
   I've looked at the methods for generating new parquet files. I think the main idea is to combine old and new data, and then filter the data which need to be deleted, so that the deleted data does not exist in the new dataset. However, in this way, the data to be deleted will not be retained in new dataset, so that only the inserted or modified data can be found according to the existing timestamp field during data tracing in incremental view.
   If we can do it, I feel that there are two ideas to consider:
   1. Trace the dataset in the same file at different time check points according to the timeline, compare the two datasets according to the key and filter out the deleted data. This method does not consume extra when writing, but it needs to call the analysis function according to the actual request during query, which consumes a lot.
   2. When writing data, if there is any deleted data, we will record it. File name such as `.delete_filename_version_timestamp`. So that we can immediately give feedback according to the time. But additional processing will be done at the time of writing.
   
   

----------------------------------------------------------------
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.
 
For queries about this service, please contact Infrastructure at:
users@infra.apache.org


With regards,
Apache Git Services

[GitHub] [incubator-hudi] cdmikechen commented on issue #1140: A suggestion that supporting a querying delete data methond in incremental view

Posted by GitBox <gi...@apache.org>.
cdmikechen commented on issue #1140: A suggestion that supporting a querying delete data methond in incremental view
URL: https://github.com/apache/incubator-hudi/issues/1140#issuecomment-569020194
 
 
   I wonder what everyone's opinion is, please.

----------------------------------------------------------------
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.
 
For queries about this service, please contact Infrastructure at:
users@infra.apache.org


With regards,
Apache Git Services

[GitHub] [incubator-hudi] cdmikechen closed issue #1140: A suggestion that supporting a querying delete data methond in incremental view

Posted by GitBox <gi...@apache.org>.
cdmikechen closed issue #1140: A suggestion that supporting a querying delete data methond in incremental view
URL: https://github.com/apache/incubator-hudi/issues/1140
 
 
   

----------------------------------------------------------------
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.
 
For queries about this service, please contact Infrastructure at:
users@infra.apache.org


With regards,
Apache Git Services

[GitHub] [incubator-hudi] cdmikechen commented on issue #1140: A suggestion that supporting a querying delete data methond in incremental view

Posted by GitBox <gi...@apache.org>.
cdmikechen commented on issue #1140: A suggestion that supporting a querying delete data methond in incremental view
URL: https://github.com/apache/incubator-hudi/issues/1140#issuecomment-569555991
 
 
   move to https://issues.apache.org/jira/projects/HUDI/issues/HUDI-480.
   close it.

----------------------------------------------------------------
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.
 
For queries about this service, please contact Infrastructure at:
users@infra.apache.org


With regards,
Apache Git Services