Don't drop the update in the Cache if the write fails #1745
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What changes were proposed in this pull request?
Improve the error recovery in the GraphWriter
Why are the changes needed?
Currently, if the write fails the updates in the cache are lost.
Does this PR introduce any user-facing change? If yes is this documented?
No
How was this patch tested?
Existing tests, need to figure out how to make this failure actually occur.