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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (PHOENIX-5069) Use asynchronous refresh to provide non-blocking Phoenix Stats Client Cache
Date Wed, 13 Feb 2019 01:19:00 GMT

    [ https://issues.apache.org/jira/browse/PHOENIX-5069?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16766632#comment-16766632
] 

Hudson commented on PHOENIX-5069:
---------------------------------

ABORTED: Integrated in Jenkins build Phoenix-4.x-HBase-1.4 #72 (See [https://builds.apache.org/job/Phoenix-4.x-HBase-1.4/72/])
PHOENIX-5069 Use asynchronous refresh to provide non-blocking Phoenix (karanmehta93: rev ffbfc8012027fa399bdba9ee4ab1074fc30229cb)
* (edit) phoenix-core/src/main/java/org/apache/phoenix/query/QueryServices.java
* (edit) phoenix-core/src/main/java/org/apache/phoenix/query/QueryServicesOptions.java
* (edit) phoenix-core/src/main/java/org/apache/phoenix/schema/stats/GuidePostsInfo.java
* (add) phoenix-core/src/test/java/org/apache/phoenix/query/PhoenixStatsCacheLoaderTest.java
* (edit) phoenix-core/src/main/java/org/apache/phoenix/query/GuidePostsCache.java
* (add) phoenix-core/src/main/java/org/apache/phoenix/query/PhoenixStatsCacheLoader.java
* (add) phoenix-core/src/main/java/org/apache/phoenix/query/PhoenixStatsLoader.java


> 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.master.004.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] 



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