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64 lines
1.9 KiB
ReStructuredText
64 lines
1.9 KiB
ReStructuredText
Schema Mismatch
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===============
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Issue
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^^^^^
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A cqlsh operation failed with ``schema version mismatch detected`` error message.
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For example
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.. code-block:: shell
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OperationTimedOut: errors={'10.1.1.54': 'Request timed out while waiting for schema agreement. See Session.execute[_async](timeout) and Cluster.max_schema_agreement_wait.'}, last_host=10.1.1.54
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Warning: schema version mismatch detected; check the schema versions of your nodes in system.local and system.peers.
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Problem
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^^^^^^^
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One or more ScyllaDB nodes have a schema mismatch.
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How to Verify
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^^^^^^^^^^^^^
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Run :doc:`nodetool describecluster </operating-scylla/nodetool-commands/describecluster/>`
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In the following example, one node, **172.17.0.3** has a different schema than the other two nodes. As a temporary state, this is fine, but if this state persists, it will fail CQL operations.
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.. code-block:: cql
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Cluster Information:
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Name: Test Cluster
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Snitch: org.apache.cassandra.locator.SimpleSnitch
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DynamicEndPointSnitch: disabled
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Partitioner: org.apache.cassandra.dht.Murmur3Partitioner
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Schema versions:
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f04247d2-e2a6-3785-9fb8-8a57c7bdb25c: [172.17.0.1, 172.17.0.2]
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b1c9af1d-4f90-39fb-a869-95eeb3da96af: [172.17.0.3]
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Solution
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^^^^^^^^
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1. Wait for five minutes and run ``nodetool describecluster`` to verify that the schema is synced.
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2. If there is still a mismatch error message execute a `rolling restart`_.
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3. Verify schema is synced
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For example:
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.. code-block:: cql
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Cluster Information:
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Name: Test Cluster
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Snitch: org.apache.cassandra.locator.SimpleSnitch
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DynamicEndPointSnitch: disabled
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Partitioner: org.apache.cassandra.dht.Murmur3Partitioner
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Schema versions:
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1fd57629-6bae-3f23-97d1-ffa4208cc372: [172.17.0.1, 172.17.0.2, 172.17.0.3]
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.. _`rolling restart`: /operating-scylla/procedures/config-change/rolling_restart/
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