Ashwani Raina created KUDU-3636:
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Summary: New Kudu client API may not work against old Kudu master
for certain cases
Key: KUDU-3636
URL: https://issues.apache.org/jira/browse/KUDU-3636
Project: Kudu
Issue Type: Bug
Components: client
Reporter: Ashwani Raina
Ran
{{$KUDU_HOMEDIR/examples/java/java-example/src/main/java/org/apache/kudu/examples/Example.java}}
from latest kudu version (that supports IMMUTABLE COL) against an old server
(that doesn't support IMMUTABLE COL), got this error:
{{Unable to handle RPC call: Not implemented: call requires unsupported
application feature flags: 10}}
The test just alters an existing table by adding a new column (not immutable
type by default) so it is expected to complete successfully.
The reason behind this is as follows:
While creating RPC request (for Alter request), the Kudu client marshalls list
of required feature flags, which in this case, includes IMMUTABLE COLUMNS.
However, when this RPC request lands on server (on lower version which doesn't
support IMMUTABLE COLUMNS), it find IMM_COL as not supported and sends back the
error to client.
The expected behaviour is that server should send error out only when the Alter
RPC request is actually trying to add an IMMUTABLE COLUMN which it doesn't
support.
Probably, a fix is required at client side to ensure it doesn't send not to be
used features as part of RequiredFeatureFlags to avoid confusion on server.
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