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Feature #14411
closedfix lost-unfound
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Description
The version in master is problematic because the log message can race with a client update messing up the log segments persisted on a replica. Additionally, the testing is pretty rudimentary: it doesn't run under thrashing.
1) Create more general mechanism for merging a set of log entries into current actingbackfill replicas which tolerates concurrent client IO
2) Adapt lost-unfound commands to use 1)
3) Use 1) to create a debug interface to inject arbitrary json entries -- that will let us create bogus unfound objects on command.
4) Use 3 and 2 to test the lost-unfound code during thrashing.
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