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https://issues.apache.org/jira/browse/CASSANDRA-2040?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13201521#comment-13201521
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Chris Lohfink commented on CASSANDRA-2040:
------------------------------------------
Would be nice for cases where you do not have any parameters. ie if you have a
simple custom seed provider. In that scenario you will not provide a
parameters argument to the seed_provider (since using default constructor):
{code}
seed_provider:
- class_name: foo.bar.DnsSeedProvider
{code}
This causes an exception
{code:java}ERROR 11:57:06,744 Fatal configuration error error
Can't construct a java object for
tag:yaml.org,2002:org.apache.cassandra.config.Config; exception=Cannot create
property=seed_provider for JavaBean=org.apache.cassandra.config.Config@3c50507;
java.lang.reflect.InvocationTargetException
in "<reader>", line 10, column 1:
cluster_name: 'Test Cluster'
^
at
org.yaml.snakeyaml.constructor.Constructor$ConstructYamlObject.construct(Constructor.java:372)
at
org.yaml.snakeyaml.constructor.BaseConstructor.constructObject(BaseConstructor.java:177)
at
org.yaml.snakeyaml.constructor.BaseConstructor.constructDocument(BaseConstructor.java:136)
at
org.yaml.snakeyaml.constructor.BaseConstructor.getSingleData(BaseConstructor.java:122)
at org.yaml.snakeyaml.Loader.load(Loader.java:52)
at org.yaml.snakeyaml.Yaml.load(Yaml.java:166)
at
org.apache.cassandra.config.DatabaseDescriptor.<clinit>(DatabaseDescriptor.java:133)
at
org.apache.cassandra.service.AbstractCassandraDaemon.setup(AbstractCassandraDaemon.java:125)
at com.datastax.bdp.server.DseDaemon.setup(DseDaemon.java:89)
at
org.apache.cassandra.service.AbstractCassandraDaemon.init(AbstractCassandraDaemon.java:238)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.commons.daemon.support.DaemonLoader.load(DaemonLoader.java:212)
Caused by: org.yaml.snakeyaml.error.YAMLException: Cannot create
property=seed_provider for JavaBean=org.apache.cassandra.config.Config@3c50507;
java.lang.reflect.InvocationTargetException
at
org.yaml.snakeyaml.constructor.Constructor$ConstructMapping.constructJavaBean2ndStep(Constructor.java:305)
at
org.yaml.snakeyaml.constructor.Constructor$ConstructMapping.construct(Constructor.java:184)
at
org.yaml.snakeyaml.constructor.Constructor$ConstructYamlObject.construct(Constructor.java:370)
... 14 more
Caused by: org.yaml.snakeyaml.error.YAMLException:
java.lang.reflect.InvocationTargetException
at
org.yaml.snakeyaml.constructor.Constructor$ConstructSequence.construct(Constructor.java:589)
at
org.yaml.snakeyaml.constructor.BaseConstructor.constructObject(BaseConstructor.java:177)
at
org.yaml.snakeyaml.constructor.Constructor$ConstructMapping.constructJavaBean2ndStep(Constructor.java:298)
... 16 more
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at
sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
at
sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
at
org.yaml.snakeyaml.constructor.Constructor$ConstructSequence.construct(Constructor.java:587)
... 18 more
Caused by: java.lang.NullPointerException
at org.apache.cassandra.config.SeedProviderDef.<init>(SeedProviderDef.java:34)
... 23 more
{code}
If you then add parameters you get a java.lang.NoSuchMethodException. The
workaround being you create a constructor that takes a Map argument, set the
parameters to anything and ignore them, which is fine but then has to be
documented as they are options that do not mean anything. Would be nice to
make the parameters optional. I attached a very simple example and a patch
that I think would work.
> Allow configuration parameters for custom Snitches
> --------------------------------------------------
>
> Key: CASSANDRA-2040
> URL: https://issues.apache.org/jira/browse/CASSANDRA-2040
> Project: Cassandra
> Issue Type: New Feature
> Components: Core
> Reporter: Jonathan Ellis
> Attachments: DnsSeedProvider.java, patch.txt
>
>
> Similar to what we did for seeds in CASSANDRA-1669
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