Make ReshardingDonorService retry on WriteConcernFailure when finishing

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    • Cluster Scalability
    • Fully Compatible
    • ClusterScalability Mar31-Apr14, ClusterScalability Apr28-May09
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      The resharding donor forces a catalog cache refresh just before transitioning to done, which forces a no-op write. This write uses a write concern timeout of 60 seconds - currently we don't retry on WriteConcernTimeout, nor do currently consider this a transient error, and so if there's slowness or some network issue that causes this write to fail, we'll fail the entire resharding operation with an fassert.

            Assignee:
            Janna Golden
            Reporter:
            Randolph Tan
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