Answer
Jumbo chunks grow too large to split or migrate, blocking balancing and degrading performance in sharded clusters.
Quick Answer
Jumbo chunks exceed the maximum chunk size (default 128MB) and can't be automatically split or migrated. Caused by: all documents in a chunk share the same shard key value (low cardinality key). The balancer can't rebalance jumbo chunks, causing permanent hotspot on one shard. Fix: choose a higher-cardinality shard key. For existing jumbo chunks, use refineCollectionShardKey or manual splitting.
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SugharaIQ Editorial Team
Verified Answer
This answer has been peer-reviewed by industry experts holding senior engineering roles to ensure technical accuracy and relevance for modern interview standards.
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Source: SugharaIQ