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https://issues.apache.org/jira/browse/HIVE-21686?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16839075#comment-16839075
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Hive QA commented on HIVE-21686:
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| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
|| || || || {color:brown} Prechecks {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:brown} master Compile Tests {color} ||
| {color:blue}0{color} | {color:blue} mvndep {color} | {color:blue} 1m
13s{color} | {color:blue} Maven dependency ordering for branch {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 8m
5s{color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 0m
37s{color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green} 0m
30s{color} | {color:green} master passed {color} |
| {color:blue}0{color} | {color:blue} findbugs {color} | {color:blue} 0m
33s{color} | {color:blue} common in master has 62 extant Findbugs warnings.
{color} |
| {color:blue}0{color} | {color:blue} findbugs {color} | {color:blue} 0m
45s{color} | {color:blue} llap-server in master has 81 extant Findbugs
warnings. {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 0m
29s{color} | {color:green} master passed {color} |
|| || || || {color:brown} Patch Compile Tests {color} ||
| {color:blue}0{color} | {color:blue} mvndep {color} | {color:blue} 0m
29s{color} | {color:blue} Maven dependency ordering for patch {color} |
| {color:red}-1{color} | {color:red} mvninstall {color} | {color:red} 0m
20s{color} | {color:red} llap-server in the patch failed. {color} |
| {color:red}-1{color} | {color:red} compile {color} | {color:red} 0m
21s{color} | {color:red} llap-server in the patch failed. {color} |
| {color:red}-1{color} | {color:red} javac {color} | {color:red} 0m 21s{color}
| {color:red} llap-server in the patch failed. {color} |
| {color:red}-1{color} | {color:red} checkstyle {color} | {color:red} 0m
14s{color} | {color:red} llap-server: The patch generated 12 new + 85 unchanged
- 15 fixed = 97 total (was 100) {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} findbugs {color} | {color:red} 0m
20s{color} | {color:red} llap-server in the patch failed. {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 0m
30s{color} | {color:green} the patch passed {color} |
|| || || || {color:brown} Other Tests {color} ||
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green} 0m
13s{color} | {color:green} The patch does not generate ASF License warnings.
{color} |
| {color:black}{color} | {color:black} {color} | {color:black} 16m 41s{color} |
{color:black} {color} |
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|| Subsystem || Report/Notes ||
| Optional Tests | asflicense javac javadoc findbugs checkstyle compile |
| uname | Linux hiveptest-server-upstream 3.16.0-4-amd64 #1 SMP Debian
3.16.43-2+deb8u5 (2017-09-19) x86_64 GNU/Linux |
| Build tool | maven |
| Personality |
/data/hiveptest/working/yetus_PreCommit-HIVE-Build-17202/dev-support/hive-personality.sh
|
| git revision | master / af97e84 |
| Default Java | 1.8.0_111 |
| findbugs | v3.0.0 |
| mvninstall |
http://104.198.109.242/logs//PreCommit-HIVE-Build-17202/yetus/patch-mvninstall-llap-server.txt
|
| compile |
http://104.198.109.242/logs//PreCommit-HIVE-Build-17202/yetus/patch-compile-llap-server.txt
|
| javac |
http://104.198.109.242/logs//PreCommit-HIVE-Build-17202/yetus/patch-compile-llap-server.txt
|
| checkstyle |
http://104.198.109.242/logs//PreCommit-HIVE-Build-17202/yetus/diff-checkstyle-llap-server.txt
|
| findbugs |
http://104.198.109.242/logs//PreCommit-HIVE-Build-17202/yetus/patch-findbugs-llap-server.txt
|
| modules | C: common llap-server U: . |
| Console output |
http://104.198.109.242/logs//PreCommit-HIVE-Build-17202/yetus.txt |
| Powered by | Apache Yetus http://yetus.apache.org |
This message was automatically generated.
> Brute Force eviction can lead to a random uncontrolled eviction pattern.
> ------------------------------------------------------------------------
>
> Key: HIVE-21686
> URL: https://issues.apache.org/jira/browse/HIVE-21686
> Project: Hive
> Issue Type: Bug
> Reporter: slim bouguerra
> Assignee: slim bouguerra
> Priority: Major
> Labels: pull-request-available
> Attachments: Cache_hitrate_improvement.csv, HIVE-21686.2.patch,
> HIVE-21686.3.patch, HIVE-21686.4.patch, HIVE-21686.patch
>
> Time Spent: 3.5h
> Remaining Estimate: 0h
>
> Current logic used by brute force eviction can lead to a perpetual random
> eviction pattern.
> For instance if the cache build a small pocket of free memory where the total
> size is greater than incoming allocation request, the allocator will randomly
> evict block that fits a particular size.
> This can happen over and over therefore all the eviction will be random.
> In Addition this random eviction will lead a leak in the linked list
> maintained by the policy since it does not know anymore about what is evicted
> and what not.
> The improvement of this patch is very substantial to TPC-DS benchmark. I
> have tested it with 10TB scale 9 llap nodes and 32GB cache size per node.
> The patch has showed very noticeable difference in the Hit rate for raw
> number [^Cache_hitrate_improvement.csv]
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