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https://issues.apache.org/jira/browse/MAPREDUCE-7057?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16626103#comment-16626103
]
Hadoop QA commented on MAPREDUCE-7057:
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| (/) *{color:green}+1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | {color:blue} reexec {color} | {color:blue} 0m
20s{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:green}+1{color} | {color:green} test4tests {color} | {color:green} 0m
0s{color} | {color:green} The patch appears to include 1 new or modified test
files. {color} |
|| || || || {color:brown} trunk Compile Tests {color} ||
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 22m
58s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 0m
32s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green} 0m
28s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green} 0m
42s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} shadedclient {color} | {color:green}
13m 32s{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
12s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 0m
37s{color} | {color:green} trunk passed {color} |
|| || || || {color:brown} Patch Compile Tests {color} ||
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 0m
43s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 0m
37s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green} 0m
37s{color} | {color:green} the patch passed {color} |
| {color:orange}-0{color} | {color:orange} checkstyle {color} | {color:orange}
0m 27s{color} | {color:orange}
hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core:
The patch generated 2 new + 25 unchanged - 19 fixed = 27 total (was 44) {color}
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| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green} 0m
41s{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}
14m 54s{color} | {color:green} patch has no errors when building and testing
our client artifacts. {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green} 1m
11s{color} | {color:green} the patch passed {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} unit {color} | {color:green} 4m
2s{color} | {color:green} hadoop-mapreduce-client-core in the patch passed.
{color} |
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green} 0m
27s{color} | {color:green} The patch does not generate ASF License warnings.
{color} |
| {color:black}{color} | {color:black} {color} | {color:black} 63m 59s{color} |
{color:black} {color} |
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|| Subsystem || Report/Notes ||
| Docker | Client=17.05.0-ce Server=17.05.0-ce Image:yetus/hadoop:4b8c2b1 |
| JIRA Issue | MAPREDUCE-7057 |
| JIRA Patch URL |
https://issues.apache.org/jira/secure/attachment/12941066/MAPREDUCE-7057.4.patch
|
| Optional Tests | dupname asflicense compile javac javadoc mvninstall
mvnsite unit shadedclient findbugs checkstyle |
| uname | Linux b39b53db0ead 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 | /testptch/patchprocess/precommit/personality/provided.sh |
| git revision | trunk / 32a35dc |
| 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-MAPREDUCE-Build/7486/artifact/out/diff-checkstyle-hadoop-mapreduce-project_hadoop-mapreduce-client_hadoop-mapreduce-client-core.txt
|
| Test Results |
https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/7486/testReport/ |
| Max. process+thread count | 301 (vs. ulimit of 10000) |
| modules | C:
hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core
U:
hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core |
| Console output |
https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/7486/console |
| Powered by | Apache Yetus 0.8.0 http://yetus.apache.org |
This message was automatically generated.
> MergeThread Review
> ------------------
>
> Key: MAPREDUCE-7057
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-7057
> Project: Hadoop Map/Reduce
> Issue Type: Improvement
> Components: mrv2
> Affects Versions: 3.0.0
> Reporter: BELUGA BEHR
> Priority: Minor
> Attachments: MAPREDUCE-7057.1.patch, MAPREDUCE-7057.2.2.patch,
> MAPREDUCE-7057.2.patch, MAPREDUCE-7057.4.patch
>
>
> Source:
>
> [MergeThread.java|https://github.com/apache/hadoop/blob/178751ed8c9d47038acf8616c226f1f52e884feb/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapreduce/task/reduce/MergeThread.java]
> Update this class to use Java 1.8 concurrent package. There also some
> corner-cases not being addressed with the current implementation:
> {code:java|title=MergeThread.java}
> // There is a scenario here where N threads have submitted inputs and are all
> waiting for the 'pendingToBeMerged' object. At this point, imagine the
> 'close' method is called. The close method will run, see nothing in the
> queue, interrupt the processing thread, and cause it to exit. Afterwards,
> the 'startMerge' threads will all be triggered and add the inputs to a queue
> for which there is no consumer. At this point, the T items have been removed
> from the inputs with no way to recover them. In practice, this may not ever
> be the case, but it can be tightened up.
> public void startMerge(Set<T> inputs) {
> if (!closed) {
> numPending.incrementAndGet();
> List<T> toMergeInputs = new ArrayList<T>();
> Iterator<T> iter=inputs.iterator();
> for (int ctr = 0; iter.hasNext() && ctr < mergeFactor; ++ctr) {
> toMergeInputs.add(iter.next());
> iter.remove();
> }
> LOG.info(getName() + ": Starting merge with " + toMergeInputs.size() +
> " segments, while ignoring " + inputs.size() + " segments");
> synchronized(pendingToBeMerged) {
> pendingToBeMerged.addLast(toMergeInputs);
> pendingToBeMerged.notifyAll();
> }
> }
> }
> public synchronized void close() throws InterruptedException {
> closed = true;
> waitForMerge();
> interrupt();
> }
> {code}
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