WIP: content: flush before checkpointing #6260
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Problem: There is no coverage to ensure FLUX_KVS_SYNC fails when there is no longer space on disk. Add coverage to t0090-content-enospc.t.
Problem: There is no coverage to ensure FLUX_KVS_SYNC does not work if there is no backing store. Add coverage in t1010-kvs-commit-sync.t.
Problem: When the KVS module is unloaded, a checkpoint of the root reference is attempted. However, a content.flush is not done beforehand. This could result in an invalid checkpoint reference as data is not guaranteed to be flushed to the backing store. Solution: Call content.flush before checkpointing. Fixes flux-framework#6237
Problem: Before checkpointing, users need to remember to call content.flush, to ensure data has been flushed to the backing store. It is easy to forget this. Within the content module, call content.flush before checkpointing. Fixes flux-framework#6242
Problem: Calls to content.checkpoint-put (via kvs_checkpoint_commit()) will automatically call content.flush. Therefore the calls to content.flush in the kvs are duplicates and now unnecessary. Remove calls to content.flush in the kvs module.
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Codecov ReportAttention: Patch coverage is
Additional details and impacted files@@ Coverage Diff @@
## master #6260 +/- ##
==========================================
- Coverage 83.91% 83.88% -0.03%
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Files 540 540
Lines 90610 90617 +7
==========================================
- Hits 76033 76013 -20
- Misses 14577 14604 +27
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Problem: Before checkpointing, users need to remember to call content.flush, to ensure data has been flushed to the backing store. It is easy to forget this.
Within the content module, call content.flush before checkpointing.
Fixes #6242
Last in the chain, this is built on top of #6255 and then #6240. So this one is last, setting WIP for now.