Q1: If you’re talking about disk space used up by deleted documents,
then yes, optimize or expungeDeletes will recover it. The former
will recover it all, the latter will rewrite segments with > 10% deleted
documents. HOWEVER: optimize is an expensive operation, and
can have deleterious side-effects, especially before Solr 7.5, see:
https://lucidworks.com/post/segment-merging-deleted-documents-optimize-may-bad/
and
https://lucidworks.com/post/solr-and-optimizing-your-index-take-ii/
NOTE: if you just ignore it, the deleted data will be merged away as
part of normal indexing so you may have to do nothing.
Q2: The data if you delete the collections should be removed from
disk, assuming you’re talking about using the Collections API,
DELETE command. Optimize won’t help because the collection is gone.
If you delete the collection and the data dirs are still hanging around,
you should look at your logs to see if there’s any information.
Best,
Erick
> On Jun 22, 2020, at 9:04 PM, ChienHuaWang <chien-hua.w...@sap.com> wrote:
>
> Hi Solr users,
>
> Q1: Wondering if there is any way to retrieve disk usage by host? Could we
> get thru metrics API or any other methods? I know the data shows in Solr
> Admin UI, but have other approach for this kind of data.
>
> Q2:
> After delete the collections, it seems not physically removed from the disk.
> Did the research, someone suggest to run an optimize which re-writes the
> index out to disk without the deleted documents, then deletes the original.
> Is there any other way to do clean up without re-writes the index? have to
> manually clean up now, and look for better approach
>
> Appreciate your feedback.
>
>
> Regards,
> Chien
>
>
>
>
>
> --
> Sent from: https://lucene.472066.n3.nabble.com/Solr-User-f472068.html
