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https://issues.apache.org/jira/browse/YARN-8872?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16648396#comment-16648396
]
Hadoop QA commented on YARN-8872:
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| (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
25s{color} | {color:blue} Docker mode activated. {color} |
|| || || || {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:red}-1{color} | {color:red} test4tests {color} | {color:red} 0m
0s{color} | {color:red} The patch doesn't appear to include any new or modified
tests. Please justify why no new tests are needed for this patch. Also please
list what manual steps were performed to verify this patch. {color} |
|| || || || {color:brown} trunk Compile Tests {color} ||
| {color:blue}0{color} | {color:blue} mvndep {color} | {color:blue} 1m
7s{color} | {color:blue} Maven dependency ordering for branch {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 20m
11s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 1m
54s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green} 0m
45s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green} 1m
6s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} shadedclient {color} | {color:green}
13m 54s{color} | {color:green} branch has no errors when building and testing
our client artifacts. {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green} 1m
51s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 0m
48s{color} | {color:green} trunk passed {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
18s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 2m
32s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green} 2m
32s{color} | {color:green} the patch passed {color} |
| {color:orange}-0{color} | {color:orange} checkstyle {color} | {color:orange}
0m 55s{color} | {color:orange}
hadoop-mapreduce-project/hadoop-mapreduce-client: The patch generated 6 new +
179 unchanged - 6 fixed = 185 total (was 185) {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green} 1m
7s{color} | {color:green} the patch passed {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} shadedclient {color} | {color:green}
13m 8s{color} | {color:green} patch has no errors when building and testing
our client artifacts. {color} |
| {color:red}-1{color} | {color:red} findbugs {color} | {color:red} 1m
16s{color} | {color:red}
hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core
generated 1 new + 0 unchanged - 0 fixed = 1 total (was 0) {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} 4m
10s{color} | {color:green} hadoop-mapreduce-client-core in the patch passed.
{color} |
| {color:green}+1{color} | {color:green} unit {color} | {color:green} 3m
50s{color} | {color:green} hadoop-mapreduce-client-hs in the patch passed.
{color} |
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green} 0m
32s{color} | {color:green} The patch does not generate ASF License warnings.
{color} |
| {color:black}{color} | {color:black} {color} | {color:black} 72m 42s{color} |
{color:black} {color} |
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|| Reason || Tests ||
| FindBugs |
module:hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core
|
| | Inconsistent synchronization of
org.apache.hadoop.mapreduce.counters.FileSystemCounterGroup.map; locked 66% of
time Unsynchronized access at FileSystemCounterGroup.java:66% of time
Unsynchronized access at FileSystemCounterGroup.java:[line 281] |
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|| Subsystem || Report/Notes ||
| Docker | Client=17.05.0-ce Server=17.05.0-ce Image:yetus/hadoop:4b8c2b1 |
| JIRA Issue | YARN-8872 |
| JIRA Patch URL |
https://issues.apache.org/jira/secure/attachment/12943696/YARN-8872.02.patch |
| Optional Tests | dupname asflicense compile javac javadoc mvninstall
mvnsite unit shadedclient findbugs checkstyle |
| uname | Linux 2d60cf31047a 3.13.0-144-generic #193-Ubuntu SMP Thu Mar 15
17:03:53 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux |
| Build tool | maven |
| Personality | /testptch/patchprocess/precommit/personality/provided.sh |
| git revision | trunk / 85ccab7 |
| maven | version: Apache Maven 3.3.9 |
| Default Java | 1.8.0_181 |
| findbugs | v3.1.0-RC1 |
| checkstyle |
https://builds.apache.org/job/PreCommit-YARN-Build/22170/artifact/out/diff-checkstyle-hadoop-mapreduce-project_hadoop-mapreduce-client.txt
|
| findbugs |
https://builds.apache.org/job/PreCommit-YARN-Build/22170/artifact/out/new-findbugs-hadoop-mapreduce-project_hadoop-mapreduce-client_hadoop-mapreduce-client-core.html
|
| Test Results |
https://builds.apache.org/job/PreCommit-YARN-Build/22170/testReport/ |
| Max. process+thread count | 306 (vs. ulimit of 10000) |
| modules | C:
hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core
hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-hs U:
hadoop-mapreduce-project/hadoop-mapreduce-client |
| Console output |
https://builds.apache.org/job/PreCommit-YARN-Build/22170/console |
| Powered by | Apache Yetus 0.8.0 http://yetus.apache.org |
This message was automatically generated.
> Optimize collections used by Yarn JHS to reduce its memory
> ----------------------------------------------------------
>
> Key: YARN-8872
> URL: https://issues.apache.org/jira/browse/YARN-8872
> Project: Hadoop YARN
> Issue Type: Improvement
> Components: yarn
> Reporter: Misha Dmitriev
> Assignee: Misha Dmitriev
> Priority: Major
> Attachments: YARN-8872.01.patch, YARN-8872.02.patch,
> jhs-bad-collections.png
>
>
> We analyzed, using jxray (www.jxray.com) a heap dump of JHS running with big
> heap in a large clusters, handling large MapReduce jobs. The heap is large
> (over 32GB) and 21.4% of it is wasted due to various suboptimal Java
> collections, mostly maps and lists that are either empty or contain only one
> element. In such under-populated collections considerable amount of memory is
> still used by just the internal implementation objects. See the attached
> excerpt from the jxray report for the details. If certain collections are
> almost always empty, they should be initialized lazily. If others almost
> always have just 1 or 2 elements, they should be initialized with the
> appropriate initial capacity of 1 or 2 (the default capacity is 16 for
> HashMap and 10 for ArrayList).
> Based on the attached report, we should do the following:
> # {{FileSystemCounterGroup.map}} - initialize lazily
> # {{CompletedTask.attempts}} - initialize with capacity 2, given most tasks
> only have one or two attempts
> # {{JobHistoryParser$TaskInfo.attemptsMap}} - initialize with capacity
> # {{CompletedTaskAttempt.diagnostics}} - initialize with capacity 1 since it
> contains one diagnostic message most of the time
> # {{CompletedTask.reportDiagnostics}} - switch to ArrayList (no reason to
> use the more wasteful LinkedList here) and initialize with capacity 1.
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