We have recently started using elasticsearch and I have very basic question
about how rebalancing works between nodes if shards are being moved due to
Lets say we have ES deployed in AWS Ec2 region and replicas are "Zone
Aware" and num of replicas = 1.
Considering that we have 3 zones in Ec2, if One entire zone goes down, ES
will start rebalancing shards associated with failed zone to remaining Two
And before rebalancing is complete (entire data set is not yet copied), if
failed zone comes back up again, does ES try to rebalance (or move) shards
which have partial data to the new zone ?
or does it wait for previous rebalancing to finish (until entire data set
is copied) and then start rebalancing again ?
If answer is former then will there be any data loss due to moving shards
with partial data ?
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