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Can't reduce index size after deleting content

gabrielmarinb

Hi:

I started performing massive deletion (during the day) in my repository. Every night a massive content ingestion is performed.

Index size was growing in about 1 to 1.5 GB daily after ingestion and now that I am deleting (almost the same quantity of documents) the growth rate remain the same. I see and increasing deleted docs number but size used is increasing at the same pace before deleting.

Solr admin

What should I do in order to free up index space?

Thanks a lot for your advice.

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Comments

cesarista

Hi:

Probably, you are leaving your content in Thrash when deleting.

If it is not the case, you may optimize index, for cleaning those deleting docs. This is in fact a recommended maintainance task for SOLR.

When a document is deleted in SOLR, the index of this document is flagged as deleted, but it still occupies size in disk. A big number of deleted docs in SOLR indices may impact in search performance.

Regards.

--C.

gabrielmarinb

Deletion process is performed using REST API with permanent=True parameter.

A couple of question regarding Optimization. Can you run optimization during normal operation (indexation/searching)?

Do you have an estimation of how long this process take? We have a dedicated solr server (16 core - 32 GB)

I also read that double the size used is needed in the file system where indexes are stored.

Thanks a lot for your guidance

cesarista

Hi:

Can you run optimization during normal operation (indexation/searching)?

- No. Manteinance normally means out of office hours.

Do you have an estimation of how long this process take? We have a dedicated solr server (16 core - 32 GB)

- Can't say. Not so much comparing with a full reindex for example. It depends on the resources for SOLR, also how fast are your indices disks, how big are your indices...

I also read that double the size used is needed in the file system where indexes are stored.

- Yes, this refers for the (SSD) disk where indices are stored. When SOLR is doing merges internally needs extra space.

Regards.

--C.