Version 4.0.9

Released on 2019/11/25.


Please consult the Upgrade Notes before upgrading from CrateDB 3.x or earlier. Before upgrading to 4.0.9 you should be running a CrateDB cluster that is at least on 3.0.7.

We recommend that you upgrade to the latest 3.3 release before moving to 4.0.9.

If you want to perform a rolling upgrade, your current CrateDB version number must be at least Version 4.0.2. Any upgrade from a version prior to this will require a full restart upgrade.

When restarting, CrateDB will migrate indexes to a newer format. Depending on the amount of data, this may delay node start-up time.


Tables that were created prior CrateDB 3.x will not function with 4.x and must be recreated before moving to 4.x.x.

You can recreate tables using COPY TO and COPY FROM or by inserting the data into a new table.

Before upgrading, you should back up your data.

Table of Contents

See the Version 4.0.0 release notes for a full list of changes in the 4.0 series.


  • Fixed an incompatibility in the PostgreSQL wire protocol which could cause queries being sent using the asyncpg python client to get stuck. (Using version 0.20 of the client).
  • Fixed two display issues in the Admin UI:
    • 0 values in the partitions view for tables could be incorrectly displayed as NULL.
    • The node health in the cluster view was not displayed when the name of a node was too long.
  • Fixed a regression introduced in 4.0.8 which could cause queries with an explicit limit larger than 1000 to fail with a numHits must be > 0 error.
  • Fixed an resiliency issue on snapshot creation while dynamic columns are created concurrently which may result in incompatibility problems on restore.
  • Fixed case sensitivity of unquoted column names inside ON CONFLICT clauses.