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https://issues.apache.org/jira/browse/YARN-3134?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14534291#comment-14534291
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Junping Du commented on YARN-3134:
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bq. For now, I'm removing the connection cache to make the first step right. 
I'll change the description of YARN-3595 for the connection cache. 
+1. The plan sounds reasonable.

> [Storage implementation] Exploiting the option of using Phoenix to access 
> HBase backend
> ---------------------------------------------------------------------------------------
>
>                 Key: YARN-3134
>                 URL: https://issues.apache.org/jira/browse/YARN-3134
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: timelineserver
>            Reporter: Zhijie Shen
>            Assignee: Li Lu
>         Attachments: SettingupPhoenixstorageforatimelinev2end-to-endtest.pdf, 
> YARN-3134-040915_poc.patch, YARN-3134-041015_poc.patch, 
> YARN-3134-041415_poc.patch, YARN-3134-042115.patch, YARN-3134-042715.patch, 
> YARN-3134-YARN-2928.001.patch, YARN-3134-YARN-2928.002.patch, 
> YARN-3134-YARN-2928.003.patch, YARN-3134-YARN-2928.004.patch, 
> YARN-3134-YARN-2928.005.patch, YARN-3134-YARN-2928.006.patch, 
> YARN-3134DataSchema.pdf, 
> hadoop-zshen-nodemanager-d-128-95-184-84.dhcp4.washington.edu.out
>
>
> Quote the introduction on Phoenix web page:
> {code}
> Apache Phoenix is a relational database layer over HBase delivered as a 
> client-embedded JDBC driver targeting low latency queries over HBase data. 
> Apache Phoenix takes your SQL query, compiles it into a series of HBase 
> scans, and orchestrates the running of those scans to produce regular JDBC 
> result sets. The table metadata is stored in an HBase table and versioned, 
> such that snapshot queries over prior versions will automatically use the 
> correct schema. Direct use of the HBase API, along with coprocessors and 
> custom filters, results in performance on the order of milliseconds for small 
> queries, or seconds for tens of millions of rows.
> {code}
> It may simply our implementation read/write data from/to HBase, and can 
> easily build index and compose complex query.



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