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https://issues.apache.org/jira/browse/MAPREDUCE-7370?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17585388#comment-17585388
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ASF GitHub Bot commented on MAPREDUCE-7370:
-------------------------------------------
ashutoshcipher commented on code in PR #4248:
URL: https://github.com/apache/hadoop/pull/4248#discussion_r956070828
##########
hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-jobclient/src/test/java/org/apache/hadoop/mapred/lib/TestMultipleOutputs.java:
##########
@@ -70,6 +76,20 @@ public void testWithCounters() throws Exception {
_testMOWithJavaSerialization(true);
}
+ @Test(expected=IOException.class)
+ public void testParallelClose() throws IOException, InterruptedException {
Review Comment:
Makes sense, I will change it in my next commit.
> Parallelize MultipleOutputs#close call
> --------------------------------------
>
> Key: MAPREDUCE-7370
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-7370
> Project: Hadoop Map/Reduce
> Issue Type: Improvement
> Affects Versions: 3.3.0
> Reporter: Prabhu Joseph
> Assignee: groot
> Priority: Major
> Labels: pull-request-available
> Time Spent: 2h 20m
> Remaining Estimate: 0h
>
> This call takes more time when there are lot of files to close and there is a
> high latency to close. Parallelize MultipleOutputs#close call to improve the
> speed.
> {code}
> public void close() throws IOException {
> for (RecordWriter writer : recordWriters.values()) {
> writer.close(null);
> }
> }
> {code}
> Idea is from [[email protected]]
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