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From Ramzi Alqrainy <>
Subject Re: Some clarification needed on "migrate" command in Collections API
Date Tue, 21 Oct 2014 17:35:08 GMT
The MIGRATE command is a synchronous operation and therefore keeping a large
read timeout on the invocation is advised. The request may still timeout due
to inherent limitations of the Collection APIs but that doesn’t necessarily
mean that the operation has failed. Users should check logs, cluster state,
source and target collections before invoking the operation again.

This command works only with collections having the compositeId router. The
target collection must not receive any writes during the time the migrate
command is running otherwise some writes may be lost.

Please note that the migrate API does not perform any de-duplication on the
documents so if the target collection contains documents with the same
uniqueKey as the documents being migrated then the target collection will
end up with duplicate documents.

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