Operations Errors

ERROR 1218 (08S01): Error connecting to master: master is running an incompatible version of MemSQL

Issue

This issue can be caused when trying to replicate between a v5.x cluster and a v6.x cluster. Cluster replication functionality changes in 6.0 mean that replication between v5 and v6 is not possible. See Replication Compatibility Between Different Cluster Versions.

Solution

You need to upgrade both clusters to 6.0 before you can replicate data again. See Upgrading to 6.0 for more information. After both clusters are running 6.0 or newer, you can re-enabling replication between the clusters.

ERROR 1795: Cannot SHOW PARTITIONS. Database memsql is not sharded.

Issue

This error occurs when you attempt to backup the sharding or memsql databases.

Solution

These databases are internal system databases, and as such, they cannot and do not need to be backed up.

ERROR 1832 (HY000): Restoring partitions on %s. Couldn’t find backup file for partition # of database X (there are ### partitions without backup files).

Issue

This error means that there is not enough available disk in the backup directory.

Solution

Make sure that you have sufficient disk space in the designated backup directory and retry the operation.

ERROR: Partition’s table metadata are out of sync for table

Issue

The most common cause for this error is an ALTER TABLE query on a sharded table which ran partially but didn’t complete successfully. This may leave table metadata in an inconsistent state where some partitions have the old metadata while some have the new.

Solutions

If the cause of the issue was a failed ALTER TABLE as described above, possible solutions are:

  • Recreate the table. This can be done by insert-selecting the data into a newly created table or reloading the data. For example:

    CREATE TABLE t_copy AS SELECT * FROM t; 
    DROP TABLE t; 
    ALTER TABLE t_copy RENAME AS t;
    
  • Find the partition(s) with inconsistent table metadata, and manually run ALTER on the leaf partitions to correct them.

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