Read documents in parallel #58
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FGasper
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This makes compareDocsFromChannels() use an errgroup to read its document-reader channels in parallel.
- This makes reportutils.FmtBytes() postfix the unit after the number; previously it just returned the (stringified) number. - This makes the “Check finished” log print if there is no error, not if there is an error. (The logic had been reversed.) - This suppresses the “No tasks found” log. (PR mongodb-labs#60 meant to do this.) - This unsets worker tracker entries once they are done being processed. (Previously they were not cleared, which made the worker tracker table much less meaningful because entries were never removed, only replaced.) - This suppresses the findCmd log for recheck tasks since the list of IDs can be long. - This suppresses the “Finished document comparison task” log if that task fails.
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This tweaks the document comparison from REP-5230 (PR #34) so that, instead of reading source and destination documents in series, they are read in parallel. This should improve comparison speed.
This copies syncmap and syncslice from mongosync.