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https://issues.apache.org/jira/browse/HBASE-27999?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17791894#comment-17791894
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Hudson commented on HBASE-27999:
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Results for branch branch-2.6
        [build #3 on 
builds.a.o|https://ci-hbase.apache.org/job/HBase%20Nightly/job/branch-2.6/3/]: 
(x) *{color:red}-1 overall{color}*
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details (if available):

(/) {color:green}+1 general checks{color}
-- For more information [see general 
report|https://ci-hbase.apache.org/job/HBase%20Nightly/job/branch-2.6/3/General_20Nightly_20Build_20Report/]


(x) {color:red}-1 jdk8 hadoop2 checks{color}
-- For more information [see jdk8 (hadoop2) 
report|https://ci-hbase.apache.org/job/HBase%20Nightly/job/branch-2.6/3/JDK8_20Nightly_20Build_20Report_20_28Hadoop2_29/]


(x) {color:red}-1 jdk8 hadoop3 checks{color}
-- For more information [see jdk8 (hadoop3) 
report|https://ci-hbase.apache.org/job/HBase%20Nightly/job/branch-2.6/3/JDK8_20Nightly_20Build_20Report_20_28Hadoop3_29/]


(x) {color:red}-1 jdk11 hadoop3 checks{color}
-- For more information [see jdk11 
report|https://ci-hbase.apache.org/job/HBase%20Nightly/job/branch-2.6/3/JDK11_20Nightly_20Build_20Report_20_28Hadoop3_29/]


(/) {color:green}+1 source release artifact{color}
-- See build output for details.


(/) {color:green}+1 client integration test{color}


> Implement cache aware load balancer
> -----------------------------------
>
>                 Key: HBASE-27999
>                 URL: https://issues.apache.org/jira/browse/HBASE-27999
>             Project: HBase
>          Issue Type: Sub-task
>          Components: Balancer
>            Reporter: Rahul Agarkar
>            Assignee: Rahul Agarkar
>            Priority: Major
>             Fix For: 3.0.0-beta-1, 4.0.0-alpha-1
>
>
> HBase uses ephemeral cache to cache the blocks by reading them from the slow 
> storages and storing them to the bucket cache. This cache is warmed up 
> everytime a region server is started. Depending on the data size and the 
> configured cache size, the cache warm up can take anywhere between a few 
> minutes to few hours. Doing this everytime the region server starts can be a 
> very expensive process. To eliminate this, HBASE-27313 implemented the cache 
> persistence feature where the region servers periodically persist the blocks 
> cached in the bucket cache. This persisted information is then used to 
> resurrect the cache in the event of a region server restart because of normal 
> restart or crash.
> This feature aims at enhancing this capability of HBase to enable the 
> balancer implementation considers the cache allocation of each region on 
> region servers when calculating a new assignment plan and uses the 
> region/region server cache allocation info reported by region servers which 
> takes into account to calculate the percentage of HFiles cached for each 
> region on the hosting server, and then use that as another factor when 
> deciding on an optimal, new assignment plan.
>  
> A design document describing the balancer can be found at 
> https://docs.google.com/document/d/1A8-eVeRhZjwL0hzFw9wmXl8cGP4BFomSlohX2QcaFg4/edit?usp=sharing



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