Nhat Nguyen df46848fb0 Migrate peer recovery from translog to retention lease (#49448)
Since 7.4, we switch from translog to Lucene as the source of history
for peer recoveries. However, we reduce the likelihood of
operation-based recoveries when performing a full cluster restart from
pre-7.4 because existing copies do not have PPRL.

To remedy this issue, we fallback using translog in peer recoveries if
the recovering replica does not have a peer recovery retention lease,
and the replication group hasn't fully migrated to PRRL.

Relates #45136
2019-12-15 10:24:39 -05:00
..
2019-10-11 16:34:11 +03:00

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