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Posted to notifications@shardingsphere.apache.org by GitBox <gi...@apache.org> on 2021/06/10 02:09:27 UTC

[GitHub] [shardingsphere] ddx10000 opened a new issue #10745: SNOWFLAKE algorithm causes data skew.

ddx10000 opened a new issue #10745:
URL: https://github.com/apache/shardingsphere/issues/10745


   Bug Report
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   Which version of ShardingSphere did you use?
   shardingsphere version: 5.0.0-RC1-SNAPSHOT
   shardingsphere-example version: 5.0.0-alpha
   
   Which project did you use? ShardingSphere-JDBC or ShardingSphere-Proxy?
   ShardingSphere-JDBC
   
   Expected behavior
   The order_id and order_item_id should include odd and even numbers respectively. But all order_id is even number and all order_item_id is odd number.
   
   Actual behavior
   ---------------------------- Print Order Data -----------------------
   order_id: 609400984137347072, user_id: 1, address_id: 1, status: INSERT_TEST_JPA
   order_id: 609400984552583168, user_id: 2, address_id: 2, status: INSERT_TEST_JPA
   order_id: 609400984581943296, user_id: 3, address_id: 3, status: INSERT_TEST_JPA
   order_id: 609400984607109120, user_id: 4, address_id: 4, status: INSERT_TEST_JPA
   order_id: 609400984628080640, user_id: 5, address_id: 5, status: INSERT_TEST_JPA
   order_id: 609400984644857856, user_id: 6, address_id: 6, status: INSERT_TEST_JPA
   order_id: 609400984661635072, user_id: 7, address_id: 7, status: INSERT_TEST_JPA
   order_id: 609400984682606592, user_id: 8, address_id: 8, status: INSERT_TEST_JPA
   order_id: 609400984703578112, user_id: 9, address_id: 9, status: INSERT_TEST_JPA
   order_id: 609400984724549632, user_id: 10, address_id: 10, status: INSERT_TEST_JPA
   ---------------------------- Print OrderItem Data -------------------
   order_item_id:609400984498057217, order_id: 609400984137347072, user_id: 1, status: INSERT_TEST_JPA
   order_item_id:609400984569360385, order_id: 609400984552583168, user_id: 2, status: INSERT_TEST_JPA
   order_item_id:609400984594526209, order_id: 609400984581943296, user_id: 3, status: INSERT_TEST_JPA
   order_item_id:609400984615497729, order_id: 609400984607109120, user_id: 4, status: INSERT_TEST_JPA
   order_item_id:609400984636469249, order_id: 609400984628080640, user_id: 5, status: INSERT_TEST_JPA
   order_item_id:609400984653246465, order_id: 609400984644857856, user_id: 6, status: INSERT_TEST_JPA
   order_item_id:609400984674217985, order_id: 609400984661635072, user_id: 7, status: INSERT_TEST_JPA
   order_item_id:609400984690995201, order_id: 609400984682606592, user_id: 8, status: INSERT_TEST_JPA
   order_item_id:609400984711966721, order_id: 609400984703578112, user_id: 9, status: INSERT_TEST_JPA
   order_item_id:609400984732938241, order_id: 609400984724549632, user_id: 10, status: INSERT_TEST_JPA
   
   Reason analyze (If you can)
   SNOWFLAKE algorithm causes data skew.
   I had check FAQ, https://shardingsphere.apache.org/document/current/en/faq/#12-why-are-the-default-distributed-auto-augment-key-strategy-provided-by-shardingsphere-not-continuous-and-most-of-them-end-with-even-numbers, but it isn't the same issue.
   
   Steps to reproduce the behavior, such as: SQL to execute, sharding rule configuration, when exception occur etc.
   run org.apache.shardingsphere.example.sharding.spring.boot.jpa.ExampleMain#main
   
   Example codes for reproduce this issue (such as a github link).
   application.properties:
   spring.profiles.active=sharding-tables
   


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[GitHub] [shardingsphere] terrymanu closed issue #10745: SNOWFLAKE algorithm causes data skew.

Posted by GitBox <gi...@apache.org>.

terrymanu closed issue #10745:
URL: https://github.com/apache/shardingsphere/issues/10745


   


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[GitHub] [shardingsphere] terrymanu commented on issue #10745: SNOWFLAKE algorithm causes data skew.

Posted by GitBox <gi...@apache.org>.

terrymanu commented on issue #10745:
URL: https://github.com/apache/shardingsphere/issues/10745#issuecomment-858602244


   Duplicate with #10732


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