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https://issues.apache.org/jira/browse/YARN-5814?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15665393#comment-15665393
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Li Lu commented on YARN-5814:
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Thanks [~BINGXUE QIU] for the doc! I have some quick questions:
1. According to the Design section, the writer may require tranquility and/or
kafka as intermediate layers. I'm wondering if there are any issues with these
dependencies?
2. For the table design, right now in timeline v.2, container is not a
top-level concept (although it is a top-level concept for YARN). Therefore I'm
not sure if it is helpful to generalize the container table to an entity table,
just as the HBase implementation? We may still put container level data into
this table, but maybe it's possible to not to limit this table to container
only?
> Add druid as storage backend in YARN Timeline Service
> ------------------------------------------------------
>
> Key: YARN-5814
> URL: https://issues.apache.org/jira/browse/YARN-5814
> Project: Hadoop YARN
> Issue Type: New Feature
> Components: ATSv2
> Affects Versions: 3.0.0-alpha2
> Reporter: Bingxue Qiu
> Attachments: Add-Druid-in-YARN-Timeline-Service.pdf
>
>
> h3. Introduction
> I propose to add druid as storage backend in YARN Timeline Service.
> We run more than 6000 applications and generate 450 million metrics daily in
> Alibaba Clusters with thousands of nodes. We need to collect and store
> meta/events/metrics data, online analyze the utilization reports of various
> dimensions and display the trends of allocation/usage resources for cluster
> by joining and aggregating data. It helps us to manage and optimize the
> cluster by tracking resource utilization.
> To achieve our goal we have changed to use druid as the storage instead of
> HBase and have achieved sub-second OLAP performance in our production
> environment for few months.
> h3. Analysis
> Currently YARN Timeline Service only supports aggregating metrics at a) flow
> level by FlowRunCoprocessor and b) application level metrics aggregating by
> AppLevelTimelineCollector, offline (time-based periodic) aggregation for
> flows/users/queues for reporting and analysis is planned but not yet
> implemented. YARN Timeline Service chooses Apache HBase as the primary
> storage backend. As we all know that HBase doesn't fit for OLAP.
> For arbitrary exploration of data,such as online analyze the utilization
> reports of various dimensions(Queue,Flow,Users,Application,CPU,Memory) by
> joining and aggregating data, Druid's custom column format enables ad-hoc
> queries without pre-computation. The format also enables fast scans on
> columns, which is important for good aggregation performance.
> To achieve our goal that support to online analyze the utilization reports of
> various dimensions, display the variation trends of allocation/usage
> resources for cluster, and arbitrary exploration of data, we propose to add
> druid storage and implement DruidWriter /DruidReader in YARN Timeline Service.
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