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https://issues.apache.org/jira/browse/KUDU-3636?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17911041#comment-17911041
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Ashwani Raina commented on KUDU-3636:
-------------------------------------
Steps to reproduce:
1. Build a kudu server (version 1.16). Start a cluster with this version. Note
master address.
2. Build a kudu client jar (version 1.17)
3. From kudu workspace version 1.17, build and run example test by following
$KUDU_HOMEDIR/examples/java/java-example/README.adoc and use master
address from step 1.
4. The test fails with exception and master info log throws following error:
{{}}
{code:java}
Unable to handle RPC call: Not implemented: call requires unsupported
application feature flags: 10{code}
{{}}
> New Kudu client API may not work against old Kudu master for certain cases
> --------------------------------------------------------------------------
>
> Key: KUDU-3636
> URL: https://issues.apache.org/jira/browse/KUDU-3636
> Project: Kudu
> Issue Type: Bug
> Components: client
> Reporter: Ashwani Raina
> Priority: Major
>
> Ran
> {{$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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