radosgw: Huge Performance impact during dynamic bucket index resharding

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Hi,

Radosgw decided to reshard a bucket with 25 million objects from 256 to 512 shards.

Resharding took about 1 hour, during this time all buckets on the cluster had a huge performance drop.

"GET" requests for small objects (on other buckets) took multiple seconds.

Are there any configuration options to reduce this impact? or limit resharding to a maximum of 256 shards?


Micha Krause
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