phoenix-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Bin Shi (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (PHOENIX-5069) Use asynchronous refresh to provide non-blocking Phoenix Stats Client Cache
Date Tue, 05 Feb 2019 23:47:00 GMT

     [ https://issues.apache.org/jira/browse/PHOENIX-5069?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Bin Shi updated PHOENIX-5069:
-----------------------------
    Attachment: PHOENIX-5069.4.x-HBase-1.4.001.patch

> Use asynchronous refresh to provide non-blocking Phoenix Stats Client Cache
> ---------------------------------------------------------------------------
>
>                 Key: PHOENIX-5069
>                 URL: https://issues.apache.org/jira/browse/PHOENIX-5069
>             Project: Phoenix
>          Issue Type: Improvement
>            Reporter: Bin Shi
>            Assignee: Bin Shi
>            Priority: Major
>         Attachments: PHOENIX-5069-4.14.1-hbase-1.3-phoenix-stats.001.patch, PHOENIX-5069-4.14.1-hbase-1.3-phoenix-stats.002.patch,
PHOENIX-5069.4.x-HBase-1.4.001.patch, PHOENIX-5069.master.001.patch, PHOENIX-5069.master.002.patch,
PHOENIX-5069.master.003.patch, PHOENIX-5069.patch
>
>          Time Spent: 6h 40m
>  Remaining Estimate: 0h
>
> The current Phoenix Stats Cache uses TTL based eviction policy. A cached entry will expire
after a given amount of time (900s by default) passed since the entry's been created. This
will lead to cache miss when Compiler/Optimizer fetches stats from cache at the next time.
As you can see from the above graph, fetching stats from the cache is a blocking operation
— when there is cache miss, it has a round trip over the wire to scan the SYSTEM.STATS Table
and to get the latest stats info, rebuild the cache and finally return the stats to the Compiler/Optimizer.
Whenever there is a cache miss, this blocking call causes significant performance penalty and
see periodic spikes.
> *This Jira suggests to use asynchronous refresh mechanism to provide a non-blocking
cache. For details, please see the linked design document below.*
> [~karanmehta93] [~twdsilva@gmail.com] [~dbwong] [~elserj] [~ankit@apache.org] [~sergey
soldatov] 



--
This message was sent by Atlassian JIRA
(v7.6.3#76005)

Mime
View raw message