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@@ -11,6 +11,22 @@ include::8.4.0.asciidoc[tag=file-based-settings-deadlock-known-issue]
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include::8.0.0.asciidoc[tag=jackson-filtering-bug]
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+// tag::reconciliation-imbalance-known-issue[]
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+* Shard rebalancing may temporarily unbalance cluster
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++
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+From 8.6.0 onwards the default shard rebalancing algorithm will compute the
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+final desired balance and then make shard movements to reconcile the current
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+state of the cluster with the desired state. However the order in which the
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+shard movements take place may be skewed towards certain nodes, causing the
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+cluster to become temporarily unbalanced while the reconciliation is ongoing.
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+As always, once a node reaches a disk watermark it will not accept any
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+additional shards, but this skew may result in nodes reaching their disk
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+watermarks more often than expected in normal operation. Once the
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+reconciliation process completes, the cluster will be balanced again.
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++
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+To avoid this problem, upgrade to 8.8.0 or later.
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+// end::reconciliation-imbalance-known-issue[]
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+
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[[bug-8.6.0]]
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[float]
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=== Bug fixes
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David Turner