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  1. Core Server
  2. SERVER-53474

Cannot read from another mongos with secondaryPreferred after creating a new collection on one mongos

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    • Type: Icon: Bug Bug
    • Resolution: Works as Designed
    • Priority: Icon: Major - P3 Major - P3
    • None
    • Affects Version/s: 4.0.21
    • Component/s: None
    • None
    • Sharding 2021-01-25, Sharding 2021-02-22, Sharding 2021-03-08, Sharding 2021-03-22, Sharding 2021-04-05, Sharding 2021-04-19, Sharding 2021-05-03

      Hi. For some reason we're using Mongo 4.0, and found the following issue.

      After I created a sharded collection with hashed sharding and inserted some data on mongos A,  I cannot read some of data with readPreference=secondary or secondaryPreferred from another mongos B.

       

      I tried mongo shell, python driver, mgo driver, and they all had the same issue.

      Finally I tried mongo 4.4 on local host, the issue was gone.

       

      I tried to find the  issue on Jira, but NOT FOUND. So is there an issue about this ? And I really want to know why that happens.

       

      Thanks.

        1. 1-create-t1-from-A.js
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        2. 2-read-t1-from-B.js
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        3. 3-create-t2-from-A.js
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        4. 4-read-t2-from-B.js
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        5. diagnostic.data-on-4.4.2.tar.bz2
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        6. image-2020-12-30-21-22-38-181.png
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        7. image-2021-01-05-11-08-14-899.png
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        8. image-2021-01-26-10-59-01-238.png
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        9. image-2021-01-26-10-59-27-147.png
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        10. image-2021-01-26-11-18-04-528.png
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        11. mdb 4.0.21.png
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        12. mdb 4.4.2.png
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        13. read.js
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        14. read col1.png
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        15. repro.js
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        16. repro.tar.gz
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        17. Screen Shot 2021-01-06 at 1.26.47 PM.png
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        18. skip reading col1.png
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        19. user mdb 4.4.2.png
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            Assignee:
            randolph@mongodb.com Randolph Tan
            Reporter:
            baiwfg2@gmail.com Chan Lewis
            Votes:
            1 Vote for this issue
            Watchers:
            10 Start watching this issue

              Created:
              Updated:
              Resolved: