haiyang1987 edited a comment on pull request #3471:
URL: https://github.com/apache/hadoop/pull/3471#issuecomment-926538825
@ferhui Thanks for your reply！
There are two problems:
1.Current code error MetricsName, unable to get actual metrics，e.g
TotalPacketsReceived，TotalPacketsSlowWriteToMirror，TotalPacketsSlowWriteToDisk，TotalPacketsSlowWriteToOsCache
MetricsRecordBuilder dnMetrics =
getMetrics(datanode.getMetrics().name());
assertTrue("More than 1 packet received",
getLongCounter("TotalPacketsReceived", dnMetrics) > 1L);
assertTrue("More than 1 slow packet to mirror",
getLongCounter("TotalPacketsSlowWriteToMirror", dnMetrics) > 1L);
assertCounter("TotalPacketsSlowWriteToDisk", 1L, dnMetrics);
assertCounter("TotalPacketsSlowWriteToOsCache", 0L, dnMetrics);
2.Current, we need to get the first or second DataNode of the pipline that
writes data to get ReceivePacketSlowMetrics of the DataNode
```
List<DataNode> datanodes = cluster.getDataNodes();
DataNode datanode = datanodes.get(0);
//If the datanode obtained here is the third node of the pipline to write
data, such as PacketsSlowWriteToMirror unable to get
MetricsRecordBuilder dnMetrics = getMetrics(datanode.getMetrics().name());
```
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