Improve docs for tombstone lifecycle management

Priya has requested some information on the SG/CB tombstone lifecycle management, and it probably would be best described in a doc.

Here's the email, we will answer in comments on this ticket, hopefully with enough information to be spun out into a doc page.

Can you please confirm the behavior of system and also other missing scenarios. Also  , can you call out if there are variations depending on SGW versions.

 

No xattr

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• delete through SGW API : remove body + meta
• purge through SGW API : remove body + meta
• delete through SDK : remove body + meta
• purge through SDK : remove body + meta

 

With XAttr: 

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• delete through SGW API : remove body . Preserve  meta (in xattr). Tombstone
• purge through SGW API : remove body + meta
• delete through SDK : remove body . Preserve  meta (in xattr). Tombstone
• purge through SDK : remove body + meta

 

TTL on documents in CBS bucket

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• Confirm that it Purges all documents ? i.e. removes docs + meta

 

metadata purge on documents :

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• Rids all meta in xattr . What happens to the doc body ?

 

Channel Cache cleanup

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Does this impact if xattr or no xattr.

Assuming the cache cleanup in 2.1.1 + only

 

Recommended method for users to delete tombstones on server

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• Setting TTL handle it ?  Does it matter if its xattr versus no xattr (depends on answer to previous)
• Query for docs with _deleted property is true and then purge them …
• In 5.5, we can do a N1QL query for sync metadata but how do we get the deleted ones from that