nishantmonu51 commented on a change in pull request #7363: Implementing dropwizard emitter for druid URL: https://github.com/apache/incubator-druid/pull/7363#discussion_r297757688
########## File path: docs/content/development/extensions-contrib/dropwizard.md ########## @@ -0,0 +1,86 @@ +--- +layout: doc_page +title: "Dropwizard metrics emitter" +--- + +<!-- + ~ Licensed to the Apache Software Foundation (ASF) under one + ~ or more contributor license agreements. See the NOTICE file + ~ distributed with this work for additional information + ~ regarding copyright ownership. The ASF licenses this file + ~ to you under the Apache License, Version 2.0 (the + ~ "License"); you may not use this file except in compliance + ~ with the License. You may obtain a copy of the License at + ~ + ~ http://www.apache.org/licenses/LICENSE-2.0 + ~ + ~ Unless required by applicable law or agreed to in writing, + ~ software distributed under the License is distributed on an + ~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY + ~ KIND, either express or implied. See the License for the + ~ specific language governing permissions and limitations + ~ under the License. + --> + +# Dropwizard Emitter + +To use this extension, make sure to [include](../../operations/including-extensions.html) `dropwizard-emitter` extension. + +## Introduction + +This extension integrates [Dropwizard](http://metrics.dropwizard.io/3.1.0/getting-started/#) metrics library with druid so that dropwizard users can easily absorb druid into their monitoring ecosystem. +It accumulates druid metrics as dropwizard metrics, and emits them to various sinks via dropwizard supported reporters. Review comment: the accumulation does not mean it queues things up, it stores the latest values in the metrics registry, the memory usage depends on the number of metrics and metric types. Note: We are not handling all individual query metrics here, it's just the metrics defined in the extension config which are counters, gauges and timers. So have minimal impact on heap usage.e.g. for a counter it uses a single AtomicLong, for gauge it gives an instantaneous value and we are caching that in the metrics extensions impl. https://metrics.dropwizard.io/4.0.0/getting-started.html has more details on the individual event types. ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: [email protected] With regards, Apache Git Services --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
