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Status

Current state: Under Discussion Accepted

Discussion thread: here

JIRA: KAFKA-15876

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package org.apache.kafka.common.errors;

/**
 * An exception that indicates remote storage is not ready to receive the requests yet.
 */
public class RemoteStorageNotReadyException extends RetriableException {

    private static final long serialVersionUID = 1L;

    public RemoteStorageNotReadyException(String message, Throwable cause) {
        super(message, cause);
    }

    public RemoteStorageNotReadyException(String message, Throwable cause) {
        super(message, cause);
    }

    public RemoteStorageNotReadyException(Throwable cause) {
        super(cause);
    }

    public RemoteStorageNotReadyException() {
    }
}

Proposed Changes

Describe the new thing you want to do in appropriate detail. This may be fairly extensive and have large subsections of its own. Or it may be a few sentences. Use judgement based on the scope of the change.
When the metadata is not ready, instead of returning ReplicaNotAvailableException in RemotePartitionMetadataStore, we will return the new RemoteStorageNotReadyException.

The consumer can read the local data as long as it knows the offset from where to fetch the data from. When there is no initial offset, the consumer decides the offset based on the below config: 

auto.offset.reset = earliest / latest / none

• For `earliest` offset policy and any offset that lies in the remote storage, the consumer (FETCH request) cannot be able to make progress until the remote log metadata gets synced.
• In a FETCH request, when there are multiple partitions where a subset of them are consuming from local and others from remote, then only the partitions which are consuming from the remote cannot make progress and the partitions that fetch data from local storage should be able to make progress.
• In a FETCH request, when the fetch-offset for a partition is within the local-storage, then it should be able to consume the messages.
• All the calls to LIST_OFFETS will fail until the remote log metadata gets synced.

Compatibility, Deprecation, and Migration Plan

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