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https://issues.apache.org/jira/browse/SOLR-14044?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17001263#comment-17001263
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Andy Vuong commented on SOLR-14044:
-----------------------------------
After some discussion, the shared core concurrency cache eviction can fall
under two strategies
# Distributed clean up which was what the initial comments above were
proposing i.e. hooking into the same path of the blob deletion logic
# Time-based eviction and lazy eviction from the cache
The second strategy allows us to design the deletion path independently and
simplifies the code. Time-based eviction will support a larger scale if we need
to evict for thousands of collections that don't get indexing/querying traffic
often. Lazy eviction will support cases such as collection name reuse in which
a collection is deleted and soon after recreated. I'll likely separate the
eviction into its own JIRA.
> Support shard/collection deletion in shared storage
> ---------------------------------------------------
>
> Key: SOLR-14044
> URL: https://issues.apache.org/jira/browse/SOLR-14044
> Project: Solr
> Issue Type: Sub-task
> Components: SolrCloud
> Reporter: Andy Vuong
> Priority: Major
>
> The Solr Cloud deletion APIs for collections and shards are not currently
> supported by shared storage but are an essential functionality required by
> the shared storage design. Deletion of objects from shared storage currently
> only happens in the indexing path (on pushes) and after the index file
> listings between the local solr process and external store have been resolved.
>
> This task is to track supporting the delete shard/collection API commands and
> its scope does not include cleaning up so called “orphaned” index files from
> blob (i.e. files that are no longer referenced by any core.metadata file on
> the external store). This will be designed/covered in another subtask.
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