[ARROW-5402] [Plasma] Pin objects in plasma store

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Won't Fix
• Component/s: C++ - Plasma
• Labels: pull-request-available
• External issue URL: https://github.com/apache/arrow/issues/16741
• Assignee: Zhijun Fu
• Reporter: Zhijun Fu
• Created: 23/May/19 09:02
• Updated: 11/Jan/23 07:40
• Resolved: 20/Feb/21 03:42

Description

https://github.com/apache/arrow/issues/4368

Sometimes we want to "pin" an object in plasma store - we don't want this object to be deleted even though there's nobody that's currently referencing it. In this case, we can specify a flag when creating the object so that it won't be deleted by LRU cache when its refcnt drops to 0, and can only be deleted by an explicit Delete() call.

Currently, we found that an actor FO problem. The actor creation task depends on a plasma object put by user. After the the actor running for a long time, the object will be deleted by plasma LRU. Then, an Actor FO happens, the creation task cannot find the object put by user, so the FO is hanging forever.

Would this make sense to you?

 

 

Issue Links

• links to: GitHub Pull Request #4389