Answer
Large documents, poor shard keys, heavy writes, and slow inter-shard networks can slow migrations.
Quick Answer
Chunk migration performance issues: migrations copy data over the network, consuming bandwidth. During migration, writes to migrating chunks are paused briefly for the final sync. If you have a poor shard key causing constant imbalance, the balancer migrates continuously. Jumbo chunks (too large to split) can't be migrated, causing permanent imbalance on one shard.
S
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