On Thu, Sep 27, 2018 at 12:08 PM Jin Mao <jin@xxxxxxxxxxxxxxxxxx> wrote:
I am running luminous and the objects were copied from Isilon with a long and similar prefix in path like /dir1/dir2/dir3/yyyy/mm/dd. The objects are copied to various buckets like bucket_YYYYMMDD/dir1/dir2/dir3/yyyy/mm/dd. This setup minimize some internal code change when moving from NFS to object store.I heard that CRUSH may NOT evenly balance OSDs if there are many common leading characters in the object name? However, I couldn't find any evidence to support this.Does anyone know further details about this?
CRUSH does use the object name as an input to generate a hashed value, but it's not a stable hash and having common prefixes should not be an issue.
Also since you're going through RGW there's quite a bit more happening to the object names, so I wouldn't worry about it.
_______________________________________________Thank you.Jin.
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