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@@ -60,6 +60,17 @@ NOTE: This setting will not affect the promotion of replicas to primaries, nor
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will it affect the assignment of replicas that have not been assigned
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previously.
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+==== Cancellation of shard relocation
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+
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+If delayed allocation times out, the master assigns the missing shards to
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+another node which will start recovery. If the missing node rejoins the
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+cluster, and its shards still have the same sync-id as the primary, shard
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+relocation will be cancelled and the synced shard will be used for recovery
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+instead.
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+
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+For this reason, the default `timeout` is set to just one minute: even if shard
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+relocation begins, cancelling recovery in favour of the synced shard is cheap.
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+
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==== Monitoring delayed unassigned shards
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The number of shards whose allocation has been delayed by this timeout setting
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Clinton Gormley