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https://issues.apache.org/jira/browse/HDFS-9772?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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John Zhuge updated HDFS-9772:
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Component/s: test
> TestBlockReplacement#testThrottler doesn't work as expected
> -----------------------------------------------------------
>
> Key: HDFS-9772
> URL: https://issues.apache.org/jira/browse/HDFS-9772
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: test
> Affects Versions: 2.7.1
> Reporter: Yiqun Lin
> Assignee: Yiqun Lin
> Priority: Minor
> Labels: test
> Fix For: 2.8.0, 2.7.3, 3.0.0-alpha1
>
> Attachments: HDFS.001.patch
>
>
> In {{TestBlockReplacement#testThrottler}}, it use a fault variable to
> calculate the ended bandwidth. It use variable {{totalBytes}} rathe than
> final variable {{TOTAL_BYTES}}. And the value of {{TOTAL_BYTES}} is set to
> {{bytesToSend}}. The {{totalBytes}} looks no meaning here and this will make
> {{totalBytes*1000/(end-start)}} always be 0 and the comparison always true.
> The method code is below:
> {code}
> @Test
> public void testThrottler() throws IOException {
> Configuration conf = new HdfsConfiguration();
> FileSystem.setDefaultUri(conf, "hdfs://localhost:0");
> long bandwidthPerSec = 1024*1024L;
> final long TOTAL_BYTES =6*bandwidthPerSec;
> long bytesToSend = TOTAL_BYTES;
> long start = Time.monotonicNow();
> DataTransferThrottler throttler = new
> DataTransferThrottler(bandwidthPerSec);
> long totalBytes = 0L;
> long bytesSent = 1024*512L; // 0.5MB
> throttler.throttle(bytesSent);
> bytesToSend -= bytesSent;
> bytesSent = 1024*768L; // 0.75MB
> throttler.throttle(bytesSent);
> bytesToSend -= bytesSent;
> try {
> Thread.sleep(1000);
> } catch (InterruptedException ignored) {}
> throttler.throttle(bytesToSend);
> long end = Time.monotonicNow();
> assertTrue(totalBytes*1000/(end-start)<=bandwidthPerSec);
> }
> {code}
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