Why is replication taking so long?

Caleb Tennis -

If you scan your /var/log/swift/all.log for replication information you may find in some cases it's taking a very long time to cycle through replication.  This is usually due to a massive storage change being made to a system and after a single replication cycle replication will be back up to its normal speed.

In addition, with clusters that are not well dispersed, such as clusters with multiple unevenly sized regions, some storage changes result in a large amount of partitions moving around the system.  These systems also are impacting by long replication times during an initial storage change, but will settle after the first replication cycle is complete.

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