Fix wal replay issue during rollup#8774
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Rollups can cause issues during wal replay. This diff fixes the issue by issuing incremental rollup at a new timestamp where the rollup would be written. We wait until the ts-1 time to read the data, and then do the rollup at timestamp. FIXES https://dgraph.atlassian.net/browse/DGRAPHCORE-92
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We have confirmation that rollups can cause issues during wal replay. This diff fixes the issue by issuing incremental rollup a new timestamp where the rollup would be written. We wait until the timestamp - 1 time to read the data, and then do the rollup at timestamp.
Performance implications:
Live loader before:
Number of TXs run : 21240
Number of N-Quads processed : 21239870
Time spent : 10m26.664095134s
N-Quads processed per second : 33929
Live Loader after the changes:
Number of TXs run : 21240
Number of N-Quads processed : 21239870
Time spent : 10m23.564645632s
N-Quads processed per second : 34312
Negligible different in time taken to upload 21 million dataset.