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mingleizhang updated MAPREDUCE-6729: ------------------------------------ Comment: was deleted (was: Thanks Kai Zheng for review this code.) > Hitting performance and error when lots of files to write or read > ----------------------------------------------------------------- > > Key: MAPREDUCE-6729 > URL: https://issues.apache.org/jira/browse/MAPREDUCE-6729 > Project: Hadoop Map/Reduce > Issue Type: Improvement > Components: benchmarks, performance, test > Reporter: mingleizhang > Assignee: mingleizhang > Priority: Minor > Labels: performance, test > Attachments: MR-6729.txt > > > When doing DFSIO test as a distributed i/o benchmark tool. Then especially > writes plenty of files to disk or read from, both can cause performance issue > and imprecise value in a way. The question is that existing practices needs > to delete files when before running a job and that will cause extra time > consumption and furthermore cause performance issue, statistical time error > and imprecise throughput while the files are lots of. So we need to replace > or improve this hack to prevent this from happening in the future. > {code} > public static void testWrite() throws Exception { > FileSystem fs = cluster.getFileSystem(); > long tStart = System.currentTimeMillis(); > bench.writeTest(fs); // this line of code will cause extra time > consumption because of fs.delete(*,*) by the writeTest method > long execTime = System.currentTimeMillis() - tStart; > bench.analyzeResult(fs, TestType.TEST_TYPE_WRITE, execTime); > } > private void writeTest(FileSystem fs) throws IOException { > Path writeDir = getWriteDir(config); > fs.delete(getDataDir(config), true); > fs.delete(writeDir, true); > runIOTest(WriteMapper.class, writeDir); > } > {code} > [https://github.com/apache/hadoop/blob/trunk/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-jobclient/src/test/java/org/apache/hadoop/fs/TestDFSIO.java] -- This message was sent by Atlassian JIRA (v6.3.4#6332) --------------------------------------------------------------------- To unsubscribe, e-mail: mapreduce-issues-unsubscr...@hadoop.apache.org For additional commands, e-mail: mapreduce-issues-h...@hadoop.apache.org