Commits on May 3, 2024

1. sqlinstance: write backwards compatible binary version …

   We keep track of sql instances in multi-tenant deployments using the
   `system.sql_instances` table. One of the columns in this table is
   `binary_version`: this is the encoding of the version that the sql
   instance is running. SQL instances know how to reach each other by
   reading from that table (more accurately, setting up a rangefeed on
   that table and updating a local cache).
   
   In cockroachdb#115223, we introduced a new, more understandable string
   representation of cockroach internal versions. This new format is,
   however, backwards incompatible: older releases of cockroach are not
   able to parse it. As a result, a mixed-version multi-tenant
   deployments may face errors if some of the instances are running an
   internal version: the older releases won't be able to parse the new
   version format. As a result, the cache will be stale and we might see
   query errors and distsql timeouts.
   
   In this commit, we introduce a backwards compatible implementation of
   the the string representation of a version. Specifically, we continue
   to use the old format if the minimum supported version is less than
   24.1 (the version in which the new formatting was added). This commit
   should eventually be reverted when we no longer support versions older
   than 24.1.
   
   Epic: none
   
   Release note: None

   

   renatolabs committed May 3, 2024
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