HPE Ezmeral Data Fabric Event Store Java API Library

Use the HPE Ezmeral Data Fabric Event Store Admin Java API library as an alternative to maprcli commands and the REST APIs for performing administrative tasks on streams and topics. This library can also be used for analysis of the contents of streams.

Javadoc

The following Apache Kafka Java API versions are supported:

Table 1. Supported Apache Kafka APIs
MapR version	Apache Kafka API
As of 6.2	2.1.1
As of 6.1	1.1
As of 6.0.1	1.0
6.0.0 and earlier	0.90

See the following APIs for detailed information:

HPE Ezmeral Data Fabric Event Store Java APIs (as of 6.1 and 6.2)

The following HPE Ezmeral Data Fabric Event Store Java APIs are available as of MapR 6.1 and HPE Ezmeral Data Fabric 6.2:

Table 2. HPE Ezmeral Data Fabric Event Store Java APIs applicable for MapR 6.1 and HPE Ezmeral Data Fabric 6.2:
Interface	Method	Description
`StreamDescriptor`	`void setCompact(boolean compact)`	Sets log compaction on a stream.
`StreamDescriptor`	`boolean getCompact()`	Gets the log compaction on a stream. Returns true if the stream has log compaction on the stream.
`StreamDescriptor`	`void setMinCompactionLagMS(long ts)`	Sets the time in (milliseconds) that a message should remain uncompacted in the topic-partition. Applies only if log compaction is enabled on the stream.
`StreamDescriptor`	`long getMinCompactionLagMS()`	Returns the minimum time (in milliseconds) a message will remain uncompacted in the topic-partition. Applies only if log compaction is enabled on the stream.
`StreamDescriptor`	`void setDeleteRetentionMS(long ts)`	Sets the time (in milliseconds) for which deleted records are retained. Applies only if log compaction is enabled on the stream.
`StreamDescriptor`	`long getDeleteRetentionMS()`	Returns the time (in milliseconds) for which deleted records are retained. Applies only if log compaction is enabled on the stream.
`Producer`	`ProducerConfig` class	The idempotence producer option is set by setting the `enable.idempotence` value of true passed through the ProducerConfig class.

HPE Ezmeral Data Fabric Event Store Java APIs (as of 6.0.1)

The following table lists the new Interfaces and APIs for MapR 6.0.1. They are the delta between MapR 6.0.1 and 6.0.0, meaning, they are applicable to MapR 6.0.1 but not MapR 6.0.0.

Table 3. HPE Ezmeral Data Fabric Event Store APIs (as of 6.0.1)
Interface and Methods	Description
Admin.close	Long duration for TimeUnit.
Admin.createTopic	TopicDescriptor array for topic attributes.
Admin.editTopic	TopicDescriptor array for topic attributes.
Admin.getTopicDescriptor	Method for retrieving topic attributes.
Admin.listTopic	Method for listing all the topics in a stream.
Admin.streamExists	Method for determining whether a stream exists.
StreamDescriptor.getDefaultTimestampType	Method for retrieving the timestamp type.
StreamDescriptor.setDefaultTimestampType	Method for setting the timestamp type.
TopicDescriptor	New MapR interface.
TopicDescriptor.getPartitions	Method associated with the new interface.
TopicDescriptor.setPartitions	Method associated with the new interface.
TopicDescriptor.getTimestampType	Method associated with the new interface.
TopicDescriptor.setTimestampType	Method associated with the new interface.
Enum TimestampType	New Enum class and associated methods.

Backward Compatibility

As of MapR 6.0.1, Apache Kafka 1.0 is supported. The following pause, resume, seekToBeginning, and seekToEnd APIs support the Collection Interface. The deprecated APIs will continue to run unchanged, however, they may be removed in a future release.

Table 4. Deprecated MapR APIs (as of 6.0.1)
Replacement Collection APIs	Deprecated APIs
void pause(Collection<TopicPartition> partitions);	void pause(TopicPartition... partitions);
void resume(Collection<TopicPartition>partitions);	void resume(TopicPartition... partitions);
void seekToBeginning(Collection<TopicPartition>);	void seekToBeginning(TopicPartition... partitions);
void seekToEnd(Collection<TopicPartition>);	void seekToEnd(TopicPartition... partitions);

The following subscribe and assign APIs support the Collection Interface (which is more generalized) as well as the List Interface. Support for the List Interface has been retained for backward binary compatibility.

Table 5. Retained MapR APIs (as of 6.0.1)
Replacement Collection APIs	Retained APIs
void subscribe(Collection<String> topics);	void subscribe(java.util.List<java.lang.String> topics);
void subscribe(Collection<String> topics, ConsumerRebalanceListener);	void subscribe(java.util.List<java.lang.String> topics, ConsumerRebalanceListener listener);
void assign(Collection<TopicPartition> partitions);	void assign(java.util.List<TopicPartition> partitions);