lianetm commented on code in PR #14413:
URL: https://github.com/apache/kafka/pull/14413#discussion_r1333314252
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clients/src/main/java/org/apache/kafka/clients/consumer/internals/MembershipManagerImpl.java:
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@@ -19,56 +19,91 @@
import org.apache.kafka.common.message.ConsumerGroupHeartbeatResponseData;
import org.apache.kafka.common.protocol.Errors;
+import org.apache.kafka.common.requests.ConsumerGroupHeartbeatRequest;
+import org.apache.kafka.common.utils.LogContext;
+import org.slf4j.Logger;
import java.util.Optional;
/**
- * Membership manager that maintains group membership for a single member
following the new
+ * Membership manager that maintains group membership for a single member,
following the new
* consumer group protocol.
* <p/>
- * This keeps membership state and assignment updated in-memory, based on the
heartbeat responses
- * the member receives. It is also responsible for computing assignment for
the group based on
- * the metadata, if the member has been selected by the broker to do so.
+ * This is responsible for:
+ * <li>Keeping member info (ex. member id, member epoch, assignment, etc.)</li>
+ * <li>Keeping member state as defined in {@link MemberState}.</li>
+ * <p/>
+ * Member info and state are updated based on the heartbeat responses the
member receives.
*/
public class MembershipManagerImpl implements MembershipManager {
+ /**
+ * ID of the consumer group the member will be part of., provided when
creating the current
+ * membership manager.
+ */
private final String groupId;
+
+ /**
+ * Group instance ID to be used by the member, provided when creating the
current membership manager.
+ */
private final Optional<String> groupInstanceId;
+
+ /**
+ * Member ID assigned by the server to the member, received in a heartbeat
response when
+ * joining the group specified in {@link #groupId}
+ */
private String memberId;
+
+ /**
+ * Current epoch of the member. It will be set to 0 by the member, and
provided to the server
+ * on the heartbeat request, to join the group. It will be then maintained
by the server,
+ * incremented as the member reconciles and acknowledges the assignments
it receives.
+ */
private int memberEpoch;
+
+ /**
+ * Current state of this member a part of the consumer group, as defined
in {@link MemberState}
+ */
private MemberState state;
+
+ /**
+ * Assignor type selection for the member. If non-null, the member will
send its selection to
+ * the server on the {@link ConsumerGroupHeartbeatRequest}. If null, the
server will select a
+ * default assignor for the member, which the member does not need to
track.
+ */
private AssignorSelection assignorSelection;
Review Comment:
I personally like optional in cases like this just because if more explicit,
so updating it.
This wasn't "optional" initially because we had a default on the cient, but
that decision changed (we leave the server to determine a default), so makes
sense to have this Optional here.
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