org.apache.flink.runtime.rest.handler.job.metrics

Class AbstractMetricsHandler<M extends MessageParameters>

java.lang.Object

org.apache.flink.shaded.netty4.io.netty.channel.ChannelHandlerAdapter

org.apache.flink.shaded.netty4.io.netty.channel.ChannelInboundHandlerAdapter

org.apache.flink.shaded.netty4.io.netty.channel.SimpleChannelInboundHandler<RoutedRequest>

org.apache.flink.runtime.rest.handler.LeaderRetrievalHandler<T>

org.apache.flink.runtime.rest.handler.AbstractHandler<T,R,M>

org.apache.flink.runtime.rest.handler.AbstractRestHandler<RestfulGateway,EmptyRequestBody,MetricCollectionResponseBody,M>

org.apache.flink.runtime.rest.handler.job.metrics.AbstractMetricsHandler<M>

Type Parameters:

M - Type of the concrete MessageParameters

All Implemented Interfaces:

AutoCloseable, org.apache.flink.shaded.netty4.io.netty.channel.ChannelHandler, org.apache.flink.shaded.netty4.io.netty.channel.ChannelInboundHandler, org.apache.flink.util.AutoCloseableAsync

Direct Known Subclasses:

JobManagerMetricsHandler, JobMetricsHandler, JobVertexMetricsHandler, SubtaskMetricsHandler, TaskManagerMetricsHandler

public abstract class AbstractMetricsHandler<M extends MessageParameters>
extends AbstractRestHandler<RestfulGateway,EmptyRequestBody,MetricCollectionResponseBody,M>

Request handler that returns for a given task a list of all available metrics or the values for a set of metrics.

If the query parameters do not contain a "get" parameter the list of all metrics is returned. {"available": [ { "name" : "X", "id" : "X" } ] }

If the query parameters do contain a "get" parameter, a comma-separated list of metric names is expected as a value. /metrics?get=X,Y The handler will then return a list containing the values of the requested metrics. [ { "id" : "X", "value" : "S" }, { "id" : "Y", "value" : "T" } ]

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.flink.shaded.netty4.io.netty.channel.ChannelHandler

org.apache.flink.shaded.netty4.io.netty.channel.ChannelHandler.Sharable

Field Summary

Fields inherited from class org.apache.flink.runtime.rest.handler.AbstractHandler

log, MAPPER

Fields inherited from class org.apache.flink.runtime.rest.handler.LeaderRetrievalHandler

leaderRetriever, logger, responseHeaders, timeout

Constructor Summary

Constructors

Constructor and Description
AbstractMetricsHandler(GatewayRetriever<? extends RestfulGateway> leaderRetriever, org.apache.flink.api.common.time.Time timeout, Map<String,String> headers, MessageHeaders<EmptyRequestBody,MetricCollectionResponseBody,M> messageHeaders, MetricFetcher metricFetcher)

Method Summary

Modifier and Type	Method and Description
protected abstract MetricStore.ComponentMetricStore	getComponentMetricStore(HandlerRequest<EmptyRequestBody> request, MetricStore metricStore) Returns the MetricStore.ComponentMetricStore that should be queried for metrics.
protected CompletableFuture<MetricCollectionResponseBody>	handleRequest(HandlerRequest<EmptyRequestBody> request, RestfulGateway gateway) This method is called for every incoming request and returns a CompletableFuture containing a the response.

Methods inherited from class org.apache.flink.runtime.rest.handler.AbstractRestHandler

getMessageHeaders, respondToRequest

Methods inherited from class org.apache.flink.runtime.rest.handler.AbstractHandler

closeAsync, closeHandlerAsync, respondAsLeader

Methods inherited from class org.apache.flink.runtime.rest.handler.LeaderRetrievalHandler

channelRead0

Methods inherited from class org.apache.flink.shaded.netty4.io.netty.channel.SimpleChannelInboundHandler

acceptInboundMessage, channelRead

Methods inherited from class org.apache.flink.shaded.netty4.io.netty.channel.ChannelInboundHandlerAdapter

channelActive, channelInactive, channelReadComplete, channelRegistered, channelUnregistered, channelWritabilityChanged, exceptionCaught, userEventTriggered

Methods inherited from class org.apache.flink.shaded.netty4.io.netty.channel.ChannelHandlerAdapter

ensureNotSharable, handlerAdded, handlerRemoved, isSharable

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.apache.flink.util.AutoCloseableAsync

close

Methods inherited from interface org.apache.flink.shaded.netty4.io.netty.channel.ChannelHandler

handlerAdded, handlerRemoved

Constructor Detail

AbstractMetricsHandler

public AbstractMetricsHandler(GatewayRetriever<? extends RestfulGateway> leaderRetriever,
                              org.apache.flink.api.common.time.Time timeout,
                              Map<String,String> headers,
                              MessageHeaders<EmptyRequestBody,MetricCollectionResponseBody,M> messageHeaders,
                              MetricFetcher metricFetcher)

Method Detail

handleRequest

protected final CompletableFuture<MetricCollectionResponseBody> handleRequest(@Nonnull
                                                                              HandlerRequest<EmptyRequestBody> request,
                                                                              @Nonnull
                                                                              RestfulGateway gateway)
                                                                       throws RestHandlerException

Description copied from class: AbstractRestHandler

This method is called for every incoming request and returns a CompletableFuture containing a the response.

Implementations may decide whether to throw RestHandlerExceptions or fail the returned CompletableFuture with a RestHandlerException.

Failing the future with another exception type or throwing unchecked exceptions is regarded as an implementation error as it does not allow us to provide a meaningful HTTP status code. In this case a HttpResponseStatus.INTERNAL_SERVER_ERROR will be returned.

Specified by:

handleRequest in class AbstractRestHandler<RestfulGateway,EmptyRequestBody,MetricCollectionResponseBody,M extends MessageParameters>

Parameters:

request - request that should be handled

gateway - leader gateway

Returns:

future containing a handler response

Throws:

RestHandlerException - if the handling failed

getComponentMetricStore

@Nullable
protected abstract MetricStore.ComponentMetricStore getComponentMetricStore(HandlerRequest<EmptyRequestBody> request,
                                                                                      MetricStore metricStore)

Returns the MetricStore.ComponentMetricStore that should be queried for metrics.