secfree created HDFS-16406:
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Summary: DataNode metric ReadsFromLocalClient does not count
short-circuit reads
Key: HDFS-16406
URL: https://issues.apache.org/jira/browse/HDFS-16406
Project: Hadoop HDFS
Issue Type: Bug
Reporter: secfree
Assignee: secfree
The following test case failed.
{code}
@Test
public void testNodeLocalMetrics() throws Exception {
Assume.assumeTrue(null == DomainSocket.getLoadingFailureReason());
Configuration conf = new HdfsConfiguration();
conf.setBoolean(HdfsClientConfigKeys.Read.ShortCircuit.KEY, true);
TemporarySocketDirectory sockDir = new TemporarySocketDirectory();
DomainSocket.disableBindPathValidation();
conf.set(DFSConfigKeys.DFS_DOMAIN_SOCKET_PATH_KEY,
new File(sockDir.getDir(),
"testNodeLocalMetrics._PORT.sock").getAbsolutePath());
MiniDFSCluster cluster = new
MiniDFSCluster.Builder(conf).numDataNodes(1).build();
try {
cluster.waitActive();
FileSystem fs = cluster.getFileSystem();
Path testFile = new Path("/testNodeLocalMetrics.txt");
long file_len = 10;
DFSTestUtil.createFile(fs, testFile, file_len, (short)1, 1L);
DFSTestUtil.readFile(fs, testFile);
List<DataNode> datanodes = cluster.getDataNodes();
assertEquals(datanodes.size(), 1);
DataNode datanode = datanodes.get(0);
MetricsRecordBuilder rb = getMetrics(datanode.getMetrics().name());
// Write related metrics
assertCounter("WritesFromLocalClient", 1L, rb);
// Read related metrics
assertCounter("ReadsFromLocalClient", 1L, rb); // failed here
} finally {
if (cluster != null) {
cluster.shutdown();
}
}
}
{code}
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