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clickhouse-kafka-connect's Issues

Failed to connect kafka and clickhouse

I run command:
./confluent-5.1.1/bin/connect-standalone ./configuration/connect-standalone.properties ./configuration/clickhouse-sink.properties
Then, I get some errors:

ERROR Failed to create job for ./configuration/clickhouse-sink.properties (org.apache.kafka.connect.cli.ConnectStandalone:108)
[2019-02-15 02:13:10,943] ERROR Stopping after connector error (org.apache.kafka.connect.cli.ConnectStandalone:119)
java.util.concurrent.ExecutionException: org.apache.kafka.connect.errors.ConnectException: Failed to find any class that implements Connector and which name matches com.grabds.kafka.connect.ClickhouseSink, available connectors are: PluginDesc{klass=class org.apache.kafka.connect.file.FileStreamSinkConnector, name='org.apache.kafka.connect.file.FileStreamSinkConnector', version='2.1.0-cp2', encodedVersion=2.1.0-cp2, type=sink, typeName='sink', location='classpath'}, PluginDesc{klass=class org.apache.kafka.connect.file.FileStreamSourceConnector, name='org.apache.kafka.connect.file.FileStreamSourceConnector', version='2.1.0-cp2', encodedVersion=2.1.0-cp2, type=source, typeName='source', location='classpath'}, PluginDesc{klass=class org.apache.kafka.connect.tools.MockConnector, name='org.apache.kafka.connect.tools.MockConnector', version='2.1.0-cp2', encodedVersion=2.1.0-cp2, type=connector, typeName='connector', location='classpath'}, PluginDesc{klass=class org.apache.kafka.connect.tools.MockSinkConnector, name='org.apache.kafka.connect.tools.MockSinkConnector', version='2.1.0-cp2', encodedVersion=2.1.0-cp2, type=sink, typeName='sink', location='classpath'}, PluginDesc{klass=class org.apache.kafka.connect.tools.MockSourceConnector, name='org.apache.kafka.connect.tools.MockSourceConnector', version='2.1.0-cp2', encodedVersion=2.1.0-cp2, type=source, typeName='source', location='classpath'}, PluginDesc{klass=class org.apache.kafka.connect.tools.SchemaSourceConnector, name='org.apache.kafka.connect.tools.SchemaSourceConnector', version='2.1.0-cp2', encodedVersion=2.1.0-cp2, type=source, typeName='source', location='classpath'}, PluginDesc{klass=class org.apache.kafka.connect.tools.VerifiableSinkConnector, name='org.apache.kafka.connect.tools.VerifiableSinkConnector', version='2.1.0-cp2', encodedVersion=2.1.0-cp2, type=source, typeName='source', location='classpath'}, PluginDesc{klass=class org.apache.kafka.connect.tools.VerifiableSourceConnector, name='org.apache.kafka.connect.tools.VerifiableSourceConnector', version='2.1.0-cp2', encodedVersion=2.1.0-cp2, type=source, typeName='source', location='classpath'}
	at org.apache.kafka.connect.util.ConvertingFutureCallback.result(ConvertingFutureCallback.java:79)
	at org.apache.kafka.connect.util.ConvertingFutureCallback.get(ConvertingFutureCallback.java:66)
	at org.apache.kafka.connect.cli.ConnectStandalone.main(ConnectStandalone.java:116)

What can I do to fix these errors ?? Please help !!

Ingestion fails if a field name in the clickhouse table contains characters other than alphanumeric

@DmitryBe

Ingestion in clickhouse fails through this connector if field name in the clickhouse schema contains characters other than alphanumeric.
E.g:-
CREATE TABLE sample (Event-Name String, Unique-ID String, Event-Time DateTime)
ENGINE = MergeTree() PARTITION BY toYYYYMM(Event-Time) ORDER BY (toYYYYMM(Event-Time), Event-Name) SETTINGS index_granularity = 8192

In the above schema all the fields have "-" in their names.

This might be required if we want to have direct mapping from field names in kafka event to schema fields in clickhouse table.

There is a small fix for this. I want to create a pull request for this. Please let me know.

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