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Posted to common-issues@hadoop.apache.org by "Steve Loughran (JIRA)" <ji...@apache.org> on 2018/10/08 15:15:00 UTC
[jira] [Commented] (HADOOP-15193) add bulk delete call to metastore
API & DDB impl
[ https://issues.apache.org/jira/browse/HADOOP-15193?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16641997#comment-16641997 ]
Steve Loughran commented on HADOOP-15193:
-----------------------------------------
DDB batch delete just takes the list of operations and runs through them in sequence, retrying if needed. There is no speedup compared to making individual requests
We do need a call in the metastore API though, as it can be a bit cleverer about the operation.
In particular: if I delete a directory, do I need to explicitly add deleted markers to all the children, or would a delete marker on the dir be enough? If so, you could be very efficient & not create deleted file markers, just those for the directories
> add bulk delete call to metastore API & DDB impl
> ------------------------------------------------
>
> Key: HADOOP-15193
> URL: https://issues.apache.org/jira/browse/HADOOP-15193
> Project: Hadoop Common
> Issue Type: Sub-task
> Components: fs/s3
> Affects Versions: 3.0.0
> Reporter: Steve Loughran
> Priority: Major
>
> recursive dir delete (and any future bulk delete API like HADOOP-15191) benefits from using the DDB bulk table delete call, which takes a list of deletes and executes. Hopefully this will offer better perf.
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