apoorvmittal10 commented on code in PR #14699:
URL: https://github.com/apache/kafka/pull/14699#discussion_r1398479915
##########
core/src/main/java/kafka/server/ClientMetricsManager.java:
##########
@@ -30,17 +69,376 @@ public class ClientMetricsManager implements Closeable {
private static final Logger log =
LoggerFactory.getLogger(ClientMetricsManager.class);
private static final ClientMetricsManager INSTANCE = new
ClientMetricsManager();
+ private static final List<Byte> SUPPORTED_COMPRESSION_TYPES =
Collections.unmodifiableList(
+ Arrays.asList(CompressionType.ZSTD.id, CompressionType.LZ4.id,
CompressionType.GZIP.id, CompressionType.SNAPPY.id));
public static ClientMetricsManager instance() {
return INSTANCE;
}
+ // Max cache size (16k active client connections per broker)
+ private static final int CM_CACHE_MAX_SIZE = 16384;
+ private final Cache<Uuid, ClientMetricsInstance> clientInstanceCache;
+ private final Map<String, SubscriptionInfo> subscriptionMap;
+ private final Time time;
+
+ // The latest subscription version is used to determine if subscription
has changed and needs
+ // to re-evaluate the client instance subscription id as per changed
subscriptions.
+ private final AtomicInteger subscriptionUpdateVersion;
+
+ private ClientMetricsManager() {
+ this(Time.SYSTEM);
+ }
+
+ // Visible for testing
+ ClientMetricsManager(Time time) {
+ this.subscriptionMap = new ConcurrentHashMap<>();
+ this.subscriptionUpdateVersion = new AtomicInteger(0);
+ this.clientInstanceCache = new SynchronizedCache<>(new
LRUCache<>(CM_CACHE_MAX_SIZE));
+ this.time = time;
+ }
public void updateSubscription(String subscriptionName, Properties
properties) {
- // TODO: Implement the update logic to manage subscriptions.
+ // Validate the subscription properties.
+ ClientMetricsConfigs.validate(subscriptionName, properties);
+ // IncrementalAlterConfigs API will send empty configs when all the
configs are deleted
+ // for respective subscription. In that case, we need to remove the
subscription from the map.
+ if (properties.isEmpty()) {
+ // Remove the subscription from the map if it exists, else ignore
the config update.
+ if (subscriptionMap.containsKey(subscriptionName)) {
+ log.info("Removing subscription [{}] from the subscription
map", subscriptionName);
+ subscriptionMap.remove(subscriptionName);
+ this.subscriptionUpdateVersion.incrementAndGet();
+ }
+ return;
+ }
+
+ updateClientSubscription(subscriptionName, new
ClientMetricsConfigs(properties));
+ }
+
+ public GetTelemetrySubscriptionsResponse
processGetTelemetrySubscriptionRequest(
+ GetTelemetrySubscriptionsRequest request, int telemetryMaxBytes,
RequestContext requestContext, int throttleMs) {
+
+ long now = time.milliseconds();
+ Uuid clientInstanceId =
Optional.ofNullable(request.data().clientInstanceId())
+ .filter(id -> !id.equals(Uuid.ZERO_UUID))
+ .orElse(generateNewClientId());
+
+ /*
+ Get the client instance from the cache or create a new one. If
subscription has changed
+ since the last request, then the client instance will be
re-evaluated. Validation of the
+ request will be done after the client instance is created. If client
issues another get
+ telemetry request prior to push interval, then the client should get
a throttle error but if
+ the subscription has changed since the last request then the client
should get the updated
+ subscription immediately.
+ */
+ ClientMetricsInstance clientInstance =
clientInstance(clientInstanceId, requestContext);
+
+ try {
+ // Validate the get request parameters for the client instance.
+ validateGetRequest(request, clientInstance, now);
+ } catch (ApiException exception) {
+ return request.getErrorResponse(throttleMs, exception);
+ }
+
+ clientInstance.lastKnownError(Errors.NONE);
+ return createGetSubscriptionResponse(clientInstanceId, clientInstance,
telemetryMaxBytes, throttleMs);
+ }
+
+ public PushTelemetryResponse
processPushTelemetryRequest(PushTelemetryRequest request,
+ int telemetryMaxBytes, RequestContext requestContext, int throttleMs) {
+
+ Uuid clientInstanceId = request.data().clientInstanceId();
+ if (clientInstanceId == null ||
Uuid.RESERVED.contains(clientInstanceId)) {
+ String msg = String.format("Invalid request from the client [%s],
invalid client instance id",
+ clientInstanceId);
+ return request.getErrorResponse(throttleMs, new
InvalidRequestException(msg));
+ }
+
+ long now = time.milliseconds();
+ ClientMetricsInstance clientInstance =
clientInstance(clientInstanceId, requestContext);
+
+ try {
+ // Validate the push request parameters for the client instance.
+ validatePushRequest(request, telemetryMaxBytes, clientInstance,
now);
+ } catch (ApiException exception) {
+ log.debug("Error validating push telemetry request from client
[{}]", clientInstanceId, exception);
+ clientInstance.lastKnownError(Errors.forException(exception));
+ return request.getErrorResponse(throttleMs, exception);
+ } finally {
+ // Update the client instance with the latest push request
parameters.
+ clientInstance.terminating(request.data().terminating());
+ }
+
+ // Push the metrics to the external client receiver plugin.
+ byte[] metrics = request.data().metrics();
+ if (metrics != null && metrics.length > 0) {
+ try {
+
ClientMetricsReceiverPlugin.instance().exportMetrics(requestContext, request);
+ } catch (Exception exception) {
+ clientInstance.lastKnownError(Errors.INVALID_RECORD);
+ return request.errorResponse(throttleMs,
Errors.INVALID_RECORD);
+ }
+ }
+
+ clientInstance.lastKnownError(Errors.NONE);
+ return new PushTelemetryResponse(new
PushTelemetryResponseData().setThrottleTimeMs(throttleMs));
}
@Override
public void close() throws IOException {
- // TODO: Implement the close logic to close the client metrics manager.
+ subscriptionMap.clear();
+ }
+
+ private void updateClientSubscription(String subscriptionName,
ClientMetricsConfigs configs) {
+ List<String> metrics =
configs.getList(ClientMetricsConfigs.SUBSCRIPTION_METRICS);
+ int pushInterval =
configs.getInt(ClientMetricsConfigs.PUSH_INTERVAL_MS);
+ List<String> clientMatchPattern =
configs.getList(ClientMetricsConfigs.CLIENT_MATCH_PATTERN);
+
+ /*
+ Update last subscription updated time to current time to indicate
that there is a change
+ in the subscription. This will be used to determine if the next
telemetry request needs
+ to re-evaluate the subscription id as per changes subscriptions.
+ */
+ int version = this.subscriptionUpdateVersion.incrementAndGet();
Review Comment:
Corrected it, `this` should be used at places where there is a local
variable with same name else directly instance variables should be accessed.
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