Examples with SnapshotReader io.atomix.protocols.raft.storage.snapshot.SnapshotReader used on opensource projects

Example 1 with SnapshotReader

use of io.atomix.protocols.raft.storage.snapshot.SnapshotReader in project atomix by atomix.

the class AbstractAppender method buildInstallRequest.

/**
 * Builds an install request for the given member.
 */
protected InstallRequest buildInstallRequest(RaftMemberContext member, Snapshot snapshot) {
    if (member.getNextSnapshotIndex() != snapshot.index()) {
        member.setNextSnapshotIndex(snapshot.index());
        member.setNextSnapshotOffset(0);
    }
    InstallRequest request;
    synchronized (snapshot) {
        // Open a new snapshot reader.
        try (SnapshotReader reader = snapshot.openReader()) {
            // Skip to the next batch of bytes according to the snapshot chunk size and current offset.
            reader.skip(member.getNextSnapshotOffset() * MAX_BATCH_SIZE);
            byte[] data = new byte[Math.min(MAX_BATCH_SIZE, reader.remaining())];
            reader.read(data);
            // Create the install request, indicating whether this is the last chunk of data based on the number
            // of bytes remaining in the buffer.
            DefaultRaftMember leader = raft.getLeader();
            request = InstallRequest.builder().withTerm(raft.getTerm()).withLeader(leader != null ? leader.nodeId() : null).withIndex(snapshot.index()).withOffset(member.getNextSnapshotOffset()).withData(data).withComplete(!reader.hasRemaining()).build();
        }
    }
    return request;
}

Example 2 with SnapshotReader

use of io.atomix.protocols.raft.storage.snapshot.SnapshotReader in project atomix by atomix.

the class RaftServiceManager method install.

/**
 * Prepares sessions for the given index.
 *
 * @param index the index for which to install snapshots
 */
private void install(long index) {
    Snapshot snapshot = raft.getSnapshotStore().getSnapshot(index - 1);
    // If snapshots exist for the prior index, iterate through snapshots and populate services/sessions.
    if (snapshot != null) {
        logger.debug("Installing snapshot {}", snapshot);
        try (SnapshotReader reader = snapshot.openReader()) {
            while (reader.hasRemaining()) {
                int length = reader.readInt();
                if (length > 0) {
                    SnapshotReader serviceReader = new SnapshotReader(reader.buffer().slice(length), reader.snapshot());
                    installService(serviceReader);
                    reader.skip(length);
                }
            }
        }
    }
}