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https://issues.apache.org/jira/browse/HBASE-21098?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16640496#comment-16640496
 ] 

Hadoop QA commented on HBASE-21098:
-----------------------------------

| (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 
31s{color} | {color:blue} Docker mode activated. {color} |
|| || || || {color:brown} Prechecks {color} ||
| {color:blue}0{color} | {color:blue} findbugs {color} | {color:blue}  0m  
1s{color} | {color:blue} Findbugs executables are not available. {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 8 new or modified test 
files. {color} |
|| || || || {color:brown} branch-1 Compile Tests {color} ||
| {color:blue}0{color} | {color:blue} mvndep {color} | {color:blue}  5m 
45s{color} | {color:blue} Maven dependency ordering for branch {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green}  3m 
16s{color} | {color:green} branch-1 passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  0m 
50s{color} | {color:green} branch-1 passed with JDK v1.8.0_181 {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  0m 
56s{color} | {color:green} branch-1 passed with JDK v1.7.0_191 {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  1m 
53s{color} | {color:green} branch-1 passed {color} |
| {color:blue}0{color} | {color:blue} refguide {color} | {color:blue}  2m 
52s{color} | {color:blue} branch has no errors when building the reference 
guide. See footer for rendered docs, which you should manually inspect. {color} 
|
| {color:green}+1{color} | {color:green} shadedjars {color} | {color:green}  2m 
39s{color} | {color:green} branch has no errors when building our shaded 
downstream artifacts. {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  0m 
42s{color} | {color:green} branch-1 passed with JDK v1.8.0_181 {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  0m 
54s{color} | {color:green} branch-1 passed with JDK v1.7.0_191 {color} |
|| || || || {color:brown} Patch Compile Tests {color} ||
| {color:blue}0{color} | {color:blue} mvndep {color} | {color:blue}  0m 
12s{color} | {color:blue} Maven dependency ordering for patch {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green}  1m 
35s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  0m 
49s{color} | {color:green} the patch passed with JDK v1.8.0_181 {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green}  0m 
49s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  0m 
57s{color} | {color:green} the patch passed with JDK v1.7.0_191 {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green}  0m 
57s{color} | {color:green} the patch passed {color} |
| {color:red}-1{color} | {color:red} checkstyle {color} | {color:red}  1m 
25s{color} | {color:red} hbase-server: The patch generated 2 new + 434 
unchanged - 1 fixed = 436 total (was 435) {color} |
| {color:green}+1{color} | {color:green} whitespace {color} | {color:green}  0m 
 0s{color} | {color:green} The patch has no whitespace issues. {color} |
| {color:red}-1{color} | {color:red} xml {color} | {color:red}  0m  0s{color} | 
{color:red} The patch has 1 ill-formed XML file(s). {color} |
| {color:blue}0{color} | {color:blue} refguide {color} | {color:blue}  2m 
34s{color} | {color:blue} patch has no errors when building the reference 
guide. See footer for rendered docs, which you should manually inspect. {color} 
|
| {color:green}+1{color} | {color:green} shadedjars {color} | {color:green}  2m 
37s{color} | {color:green} patch has no errors when building our shaded 
downstream artifacts. {color} |
| {color:green}+1{color} | {color:green} hadoopcheck {color} | {color:green}  
1m 37s{color} | {color:green} Patch does not cause any errors with Hadoop 
2.7.4. {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  0m 
42s{color} | {color:green} the patch passed with JDK v1.8.0_181 {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  0m 
55s{color} | {color:green} the patch passed with JDK v1.7.0_191 {color} |
|| || || || {color:brown} Other Tests {color} ||
| {color:green}+1{color} | {color:green} unit {color} | {color:green}  2m  
5s{color} | {color:green} hbase-common in the patch passed. {color} |
| {color:red}-1{color} | {color:red} unit {color} | {color:red}112m 42s{color} 
| {color:red} hbase-server in the patch failed. {color} |
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green}  0m 
42s{color} | {color:green} The patch does not generate ASF License warnings. 
{color} |
| {color:black}{color} | {color:black} {color} | {color:black}150m 20s{color} | 
{color:black} {color} |
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|| Reason || Tests ||
| XML | Parsing Error(s): |
|   | hbase-common/src/main/resources/hbase-default.xml |
| Failed junit tests | hadoop.hbase.regionserver.TestEndToEndSplitTransaction |
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|| Subsystem || Report/Notes ||
| Docker | Client=17.05.0-ce Server=17.05.0-ce Image:yetus/hbase:61288f8 |
| JIRA Issue | HBASE-21098 |
| JIRA Patch URL | 
https://issues.apache.org/jira/secure/attachment/12942617/HBASE-21098.branch-1.002.patch
 |
| Optional Tests |  dupname  asflicense  javac  javadoc  unit  refguide  xml  
findbugs  shadedjars  hadoopcheck  hbaseanti  checkstyle  compile  |
| uname | Linux 06ba5f82271e 3.13.0-153-generic #203-Ubuntu SMP Thu Jun 14 
08:52:28 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux |
| Build tool | maven |
| Personality | 
/home/jenkins/jenkins-slave/workspace/PreCommit-HBASE-Build/component/dev-support/hbase-personality.sh
 |
| git revision | branch-1 / ae606c3 |
| maven | version: Apache Maven 3.0.5 |
| Default Java | 1.7.0_191 |
| Multi-JDK versions |  /usr/lib/jvm/java-8-openjdk-amd64:1.8.0_181 
/usr/lib/jvm/java-7-openjdk-amd64:1.7.0_191 |
| refguide | 
https://builds.apache.org/job/PreCommit-HBASE-Build/14581/artifact/patchprocess/branch-site/book.html
 |
| checkstyle | 
https://builds.apache.org/job/PreCommit-HBASE-Build/14581/artifact/patchprocess/diff-checkstyle-hbase-server.txt
 |
| xml | 
https://builds.apache.org/job/PreCommit-HBASE-Build/14581/artifact/patchprocess/xml.txt
 |
| refguide | 
https://builds.apache.org/job/PreCommit-HBASE-Build/14581/artifact/patchprocess/patch-site/book.html
 |
| unit | 
https://builds.apache.org/job/PreCommit-HBASE-Build/14581/artifact/patchprocess/patch-unit-hbase-server.txt
 |
|  Test Results | 
https://builds.apache.org/job/PreCommit-HBASE-Build/14581/testReport/ |
| Max. process+thread count | 4040 (vs. ulimit of 10000) |
| modules | C: hbase-common hbase-server U: . |
| Console output | 
https://builds.apache.org/job/PreCommit-HBASE-Build/14581/console |
| Powered by | Apache Yetus 0.8.0   http://yetus.apache.org |


This message was automatically generated.



> Improve Snapshot Performance with Temporary Snapshot Directory when rootDir 
> on S3
> ---------------------------------------------------------------------------------
>
>                 Key: HBASE-21098
>                 URL: https://issues.apache.org/jira/browse/HBASE-21098
>             Project: HBase
>          Issue Type: Improvement
>    Affects Versions: 3.0.0, 1.4.8, 2.1.1
>            Reporter: Tyler Mi
>            Priority: Major
>             Fix For: 3.0.0, 2.2.0
>
>         Attachments: HBASE-21098.branch-1.001.patch, 
> HBASE-21098.branch-1.002.patch, HBASE-21098.master.001.patch, 
> HBASE-21098.master.002.patch, HBASE-21098.master.003.patch, 
> HBASE-21098.master.004.patch, HBASE-21098.master.005.patch, 
> HBASE-21098.master.006.patch, HBASE-21098.master.007.patch, 
> HBASE-21098.master.008.patch, HBASE-21098.master.009.patch, 
> HBASE-21098.master.010.patch, HBASE-21098.master.011.patch, 
> HBASE-21098.master.012.patch, HBASE-21098.master.013.patch
>
>
> When using Apache HBase, the snapshot feature can be used to make a point in 
> time recovery. To do this, HBase creates a manifest of all the files in all 
> of the Regions so that those files can be referenced again when a user 
> restores a snapshot. With HBase's S3 storage mode, developers can store their 
> data off-cluster on Amazon S3. However, utilizing S3 as a file system is 
> inefficient in some operations, namely renames. Most Hadoop ecosystem 
> applications use an atomic rename as a method of committing data. However, 
> with S3, a rename is a separate copy and then a delete of every file which is 
> no longer atomic and, in fact, quite costly. In addition, puts and deletes on 
> S3 have latency issues that traditional filesystems do not encounter when 
> manipulating the region snapshots to consolidate into a single manifest. When 
> HBase on S3 users have a significant amount of regions, puts, deletes, and 
> renames (the final commit stage of the snapshot) become the bottleneck 
> causing snapshots to take many minutes or even hours to complete.
> The purpose of this patch is to increase the overall performance of snapshots 
> while utilizing HBase on S3 through the use of a temporary directory for the 
> snapshots that exists on a traditional filesystem like HDFS to circumvent the 
> bottlenecks.



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