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https://issues.apache.org/jira/browse/HBASE-20542?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16540173#comment-16540173
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Hudson commented on HBASE-20542:
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Results for branch master
        [build #393 on 
builds.a.o|https://builds.apache.org/job/HBase%20Nightly/job/master/393/]: (x) 
*{color:red}-1 overall{color}*
----
details (if available):

(/) {color:green}+1 general checks{color}
-- For more information [see general 
report|https://builds.apache.org/job/HBase%20Nightly/job/master/393//General_Nightly_Build_Report/]




(/) {color:green}+1 jdk8 hadoop2 checks{color}
-- For more information [see jdk8 (hadoop2) 
report|https://builds.apache.org/job/HBase%20Nightly/job/master/393//JDK8_Nightly_Build_Report_(Hadoop2)/]


(x) {color:red}-1 jdk8 hadoop3 checks{color}
-- For more information [see jdk8 (hadoop3) 
report|https://builds.apache.org/job/HBase%20Nightly/job/master/393//JDK8_Nightly_Build_Report_(Hadoop3)/]


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


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


> Better heap utilization for IMC with MSLABs
> -------------------------------------------
>
>                 Key: HBASE-20542
>                 URL: https://issues.apache.org/jira/browse/HBASE-20542
>             Project: HBase
>          Issue Type: Sub-task
>          Components: in-memory-compaction
>            Reporter: Eshcar Hillel
>            Assignee: Eshcar Hillel
>            Priority: Major
>             Fix For: 3.0.0, 2.2.0
>
>         Attachments: HBASE-20542-addendum.master.005.patch, 
> HBASE-20542.branch-2.001.patch, HBASE-20542.branch-2.003.patch, 
> HBASE-20542.branch-2.004.patch, HBASE-20542.branch-2.005.patch, 
> HBASE-20542.master.003.patch, HBASE-20542.master.005-addendum.patch, run.sh, 
> workloada, workloadc, workloadx, workloady
>
>
> Following HBASE-20188 we realized in-memory compaction combined with MSLABs 
> may suffer from heap under-utilization due to internal fragmentation. This 
> jira presents a solution to circumvent this problem. The main idea is to have 
> each update operation check if it will cause overflow in the active segment 
> *before* it is writing the new value (instead of checking the size after the 
> write is completed), and if it is then the active segment is atomically 
> swapped with a new empty segment, and is pushed (full-yet-not-overflowed) to 
> the compaction pipeline. Later on the IMC deamon will run its compaction 
> operation (flatten index/merge indices/data compaction) in the background. 
> Some subtle concurrency issues should be handled with care. We next elaborate 
> on them.



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