[Bug 1838858] Re: backport GC AIO to Luminous

[James Page]

** Description changed:

+ [Impact]
+ In RGW deployments with large deltas for deleted objects, the garbage collector will easily fall behind on cleanup of deleted objects eventually resulting in OSD devices hitting storage capacity.
+ 
+ [Test Case]
+ Deploy Ceph + RADOS Gateway
+ Create millions of objects in an iterative loop
+ Start deleting objects in parallel at a high rate
+ Storage capacity will gradually reduce over time as RGW garbage collection falls behind.
+ 
+ 
+ [Tricky to reproduce without significant scale of objects + deletion but proposed fix has been tested in the field.]
+ 
+ [Regression Potential]
+ Low - fix has been accepted into Ceph Luminous upstream and will form part of the next point release.
+ 
+ [Original Bug Report]
  SRU for backport of the GC AIO feature to Ceph Luminous.
  
  https://github.com/ceph/ceph/pull/28784

** Description changed:

  [Impact]
  In RGW deployments with large deltas for deleted objects, the garbage collector will easily fall behind on cleanup of deleted objects eventually resulting in OSD devices hitting storage capacity.
  
  [Test Case]
  Deploy Ceph + RADOS Gateway
  Create millions of objects in an iterative loop
  Start deleting objects in parallel at a high rate
  Storage capacity will gradually reduce over time as RGW garbage collection falls behind.
  
- 
- [Tricky to reproduce without significant scale of objects + deletion but proposed fix has been tested in the field.]
+ [Tricky to reproduce without significant scale of objects + deletion but
+ proposed fix has been tested in the field.]
  
  [Regression Potential]
- Low - fix has been accepted into Ceph Luminous upstream and will form part of the next point release.
+ Low - fix has been accepted into Ceph Luminous upstream and will form part of the next point release.  Change to use AIO for GC is also in later Ceph releases.
  
  [Original Bug Report]
  SRU for backport of the GC AIO feature to Ceph Luminous.
  
  https://github.com/ceph/ceph/pull/28784

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https://bugs.launchpad.net/bugs/1838858

Title:
  backport GC AIO to Luminous

Status in Ubuntu Cloud Archive:
  Invalid
Status in Ubuntu Cloud Archive pike series:
  Triaged
Status in Ubuntu Cloud Archive queens series:
  Triaged
Status in ceph package in Ubuntu:
  Invalid
Status in ceph source package in Bionic:
  Triaged

Bug description:
  [Impact]
  In RGW deployments with large deltas for deleted objects, the garbage collector will easily fall behind on cleanup of deleted objects eventually resulting in OSD devices hitting storage capacity.

  [Test Case]
  Deploy Ceph + RADOS Gateway
  Create millions of objects in an iterative loop
  Start deleting objects in parallel at a high rate
  Storage capacity will gradually reduce over time as RGW garbage collection falls behind.

  [Tricky to reproduce without significant scale of objects + deletion
  but proposed fix has been tested in the field.]

  [Regression Potential]
  Low - fix has been accepted into Ceph Luminous upstream and will form part of the next point release.  Change to use AIO for GC is also in later Ceph releases.

  [Original Bug Report]
  SRU for backport of the GC AIO feature to Ceph Luminous.

  https://github.com/ceph/ceph/pull/28784

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