ferhui commented on a change in pull request #3471:
URL: https://github.com/apache/hadoop/pull/3471#discussion_r716051187
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File path:
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/TestDataNodeMetrics.java
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@@ -190,18 +190,28 @@ public Object answer(InvocationOnMock invocationOnMock)
DataNodeFaultInjector.set(injector);
Path testFile = new Path("/testFlushNanosMetric.txt");
FSDataOutputStream fout = fs.create(testFile);
+ DFSOutputStream dout = (DFSOutputStream) fout.getWrappedStream();
fout.write(new byte[1]);
fout.hsync();
+ DatanodeInfo[] pipeline = dout.getPipeline();
fout.close();
+ dout.close();
+ DatanodeInfo headDatanodeInfo = pipeline[0];
+ DataNode headNode = null;
List<DataNode> datanodes = cluster.getDataNodes();
- DataNode datanode = datanodes.get(0);
- MetricsRecordBuilder dnMetrics =
getMetrics(datanode.getMetrics().name());
+ for (DataNode datanode : datanodes) {
Review comment:
Could we change this to lambda like this
` DataNode headNode = datanodes.stream()
.filter(d -> d.getDatanodeId().equals(headDatanodeInfo))
.findFirst().orElseGet(() -> null);
`
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