Comments (2)
kaloianm
commented on June 29, 2024
Technically there is no fundamental reason why only Phase 1 should not be able to run on a zoned collection, because it only does merges. Problem is with Phase 2, which moves chunks and the script is not aware of zones.
So @dryabtse , if you want to "comment-out" that part for some customer, feel free, but you need to be very careful to stop the script before it reaches to the next Phase.
CC @toto-dev
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kaloianm
commented on June 29, 2024
@ppolato just pointed out to me that if we have two or more zones which overlap on the same shard, Phase1 will merge the chunks across the zones. This will not constitute a zone violation, because the balancer later on will split them again at the zone boundaries.
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Related Issues (20)
- Make data size calculation threshold in phase 1 configurable HOT 1
- Sort shards before processing them in phase 2
- Recalculate splitVector's maxChunkSize based on surplus
- Cache shard host in phase 3 HOT 1
- Collect phase 3 stats
- Prevent running defrag script in mongodb versions grather than 4.4
- Abort defrag script if collection has associated zones
- Add option to prevent writes to config collections
- Defrag script crash on 4.4 due to unexpected balancer setting format. HOT 1
- Add support for nested shard key
- Add auth support for direct to shard connections
- Send bulk split commands
- The logic for move&merge with right neighbour is missing the is_overweight condition
- [defragmentation script] Handle merges failed due to LockBusy error
- Codec option is breaking the updates on `config.chunks`
- Introduce parameters to throttle phase 1 and 3
- The script should have a hard cap on the number of chunks it tries to merge at a time to avoid hitting 16 MB BSON size limit
- The script breaks if the shard key is using UUID type HOT 3
- Accept user/password as arguments of `make_direct_shard_connection`
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