Migrate peer recovery from translog to retention lease#50211
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dnhatn merged 1 commit intoelastic:7.5from Dec 16, 2019
Merged
Migrate peer recovery from translog to retention lease#50211dnhatn merged 1 commit intoelastic:7.5from
dnhatn merged 1 commit intoelastic:7.5from
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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 elastic#45136
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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.
Backport of #49448
Relates #45136