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https://issues.apache.org/jira/browse/HBASE-22127?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16808889#comment-16808889
 ] 

Hadoop QA commented on HBASE-22127:
-----------------------------------

| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | {color:blue} reexec {color} | {color:blue}  0m 
12s{color} | {color:blue} Docker mode activated. {color} |
|| || || || {color:brown} Prechecks {color} ||
| {color:green}+1{color} | {color:green} hbaseanti {color} | {color:green}  0m  
0s{color} | {color:green} Patch does not have any anti-patterns. {color} |
| {color:green}+1{color} | {color:green} @author {color} | {color:green}  0m  
0s{color} | {color:green} The patch does not contain any @author tags. {color} |
| {color:green}+1{color} | {color:green} test4tests {color} | {color:green}  0m 
 0s{color} | {color:green} The patch appears to include 9 new or modified test 
files. {color} |
|| || || || {color:brown} HBASE-21879 Compile Tests {color} ||
| {color:blue}0{color} | {color:blue} mvndep {color} | {color:blue}  0m 
30s{color} | {color:blue} Maven dependency ordering for branch {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green}  4m 
18s{color} | {color:green} HBASE-21879 passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  3m 
26s{color} | {color:green} HBASE-21879 passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  1m 
43s{color} | {color:green} HBASE-21879 passed {color} |
| {color:green}+1{color} | {color:green} shadedjars {color} | {color:green}  4m 
35s{color} | {color:green} branch has no errors when building our shaded 
downstream artifacts. {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green}  3m  
1s{color} | {color:green} HBASE-21879 passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  0m 
48s{color} | {color:green} HBASE-21879 passed {color} |
|| || || || {color:brown} Patch Compile Tests {color} ||
| {color:blue}0{color} | {color:blue} mvndep {color} | {color:blue}  0m 
14s{color} | {color:blue} Maven dependency ordering for patch {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green}  4m 
12s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  3m 
22s{color} | {color:green} the patch passed {color} |
| {color:red}-1{color} | {color:red} javac {color} | {color:red}  2m 44s{color} 
| {color:red} hbase-server generated 1 new + 193 unchanged - 1 fixed = 194 
total (was 194) {color} |
| {color:red}-1{color} | {color:red} checkstyle {color} | {color:red}  0m 
24s{color} | {color:red} hbase-common: The patch generated 1 new + 0 unchanged 
- 0 fixed = 1 total (was 0) {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  1m 
18s{color} | {color:green} hbase-server: The patch generated 0 new + 137 
unchanged - 4 fixed = 137 total (was 141) {color} |
| {color:green}+1{color} | {color:green} whitespace {color} | {color:green}  0m 
 0s{color} | {color:green} The patch has no whitespace issues. {color} |
| {color:green}+1{color} | {color:green} shadedjars {color} | {color:green}  4m 
32s{color} | {color:green} patch has no errors when building our shaded 
downstream artifacts. {color} |
| {color:green}+1{color} | {color:green} hadoopcheck {color} | {color:green} 
10m 23s{color} | {color:green} Patch does not cause any errors with Hadoop 
2.7.4 or 3.0.0. {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green}  3m 
18s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  0m 
47s{color} | {color:green} the patch passed {color} |
|| || || || {color:brown} Other Tests {color} ||
| {color:green}+1{color} | {color:green} unit {color} | {color:green}  2m 
31s{color} | {color:green} hbase-common in the patch passed. {color} |
| {color:red}-1{color} | {color:red} unit {color} | {color:red}143m 11s{color} 
| {color:red} hbase-server in the patch failed. {color} |
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green}  0m 
44s{color} | {color:green} The patch does not generate ASF License warnings. 
{color} |
| {color:black}{color} | {color:black} {color} | {color:black}194m 24s{color} | 
{color:black} {color} |
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|| Reason || Tests ||
| Failed junit tests | 
hadoop.hbase.replication.TestSyncReplicationStandbyKillRS |
|   | hadoop.hbase.client.TestAsyncDecommissionAdminApi |
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|| Subsystem || Report/Notes ||
| Docker | Client=17.05.0-ce Server=17.05.0-ce Image:yetus/hbase:b002b0b |
| JIRA Issue | HBASE-22127 |
| JIRA Patch URL | 
https://issues.apache.org/jira/secure/attachment/12964698/HBASE-22127.HBASE-21879.v4.patch
 |
| Optional Tests |  dupname  asflicense  javac  javadoc  unit  findbugs  
shadedjars  hadoopcheck  hbaseanti  checkstyle  compile  |
| uname | Linux 747a12b64679 4.4.0-131-generic #157~14.04.1-Ubuntu SMP Fri Jul 
13 08:53:17 UTC 2018 x86_64 GNU/Linux |
| Build tool | maven |
| Personality | 
/home/jenkins/jenkins-slave/workspace/PreCommit-HBASE-Build/component/dev-support/hbase-personality.sh
 |
| git revision | HBASE-21879 / 5da82994b3 |
| maven | version: Apache Maven 3.5.4 
(1edded0938998edf8bf061f1ceb3cfdeccf443fe; 2018-06-17T18:33:14Z) |
| Default Java | 1.8.0_181 |
| findbugs | v3.1.11 |
| javac | 
https://builds.apache.org/job/PreCommit-HBASE-Build/16631/artifact/patchprocess/diff-compile-javac-hbase-server.txt
 |
| checkstyle | 
https://builds.apache.org/job/PreCommit-HBASE-Build/16631/artifact/patchprocess/diff-checkstyle-hbase-common.txt
 |
| unit | 
https://builds.apache.org/job/PreCommit-HBASE-Build/16631/artifact/patchprocess/patch-unit-hbase-server.txt
 |
|  Test Results | 
https://builds.apache.org/job/PreCommit-HBASE-Build/16631/testReport/ |
| Max. process+thread count | 5107 (vs. ulimit of 10000) |
| modules | C: hbase-common hbase-server U: . |
| Console output | 
https://builds.apache.org/job/PreCommit-HBASE-Build/16631/console |
| Powered by | Apache Yetus 0.8.0   http://yetus.apache.org |


This message was automatically generated.



> Ensure that the block cached in the LRUBlockCache offheap is allocated from 
> heap
> --------------------------------------------------------------------------------
>
>                 Key: HBASE-22127
>                 URL: https://issues.apache.org/jira/browse/HBASE-22127
>             Project: HBase
>          Issue Type: Sub-task
>            Reporter: Zheng Hu
>            Assignee: Zheng Hu
>            Priority: Major
>         Attachments: HBASE-22127.HBASE-21879.v1.patch, 
> HBASE-22127.HBASE-21879.v2.patch, HBASE-22127.HBASE-21879.v3.patch, 
> HBASE-22127.HBASE-21879.v4.patch
>
>
> In here [1], [~anoop.hbase] pointed out  an crtial problem , I pasted here: 
> bq. So if we read from HDFS into a pooled BB and then give to LRU cache for 
> caching (ya mostly cache on read might be true) we will cache the block which 
> is backed by this pooled DBB? Unless the block is evicted , this BB wont go 
> back to pool.  I think this is some thing we can not livw with !!  For LRU 
> cache the sizing itself is based on what % of heap size we can grow. But here 
> in effect we are occupying the off heap space for the cached blocks.  All the 
> sizing assumptions and calc going out of control !
> It's indeed an big problem here. so we can only make the block ref to an heap 
> area if we use LRUCache (both LruBlockCache and CombinedBlockCache case). Or 
> we can also  make the lru cache offheap ? 
> I think we can introduce an switch indicate that whether the lru block cache 
> offheap or not, if heap, then coping those bytes from ByteBuff to heap.
> https://reviews.apache.org/r/70153/diff/6?file=2133545#file2133545line398



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