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Goodbye and thank you synced flush! (#50882)

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Synced flush was a brilliant idea. It supports instant recoveries with a 
quite small implementation. However, with the presence of sequence
numbers and retention leases, it is no longer needed. This change
removes it from 8.0.

Relates #5077
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Nhat Nguyen 2020-01-16 09:43:07 -05:00 • committed by GitHub
parent adb56e5842
commit 09b46c8646
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2
docs/reference/index-modules/allocation/delayed.asciidoc
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@ -28,7 +28,7 @@ this scenario:
If the master had just waited for a few minutes, then the missing shards could
have been re-allocated to Node 5 with the minimum of network traffic. This
process would be even quicker for idle shards (shards not receiving indexing
requests) which have been automatically <<indices-synced-flush-api,sync-flushed>>.
requests) which have been automatically <<indices-flush, flushed>>.
The allocation of replica shards which become unassigned because a node has
left can be delayed with the `index.unassigned.node_left.delayed_timeout`