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HDFS-15633. Avoid redundant RPC calls for getDiskStatus. (#2386). Contributed by Ayush Saxena.

This commit is contained in:
Ayush Saxena 2020-10-16 10:36:24 +05:30
parent 162923e799
commit 8354ce680b
1 changed files with 11 additions and 2 deletions
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13
hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/DFSClient.java
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@ -1939,8 +1939,17 @@ public class DFSClient implements java.io.Closeable, RemotePeerFactory,
* @see ClientProtocol#getStats()
*/
public FsStatus getDiskStatus() throws IOException {
return new FsStatus(getStateByIndex(0),
getStateByIndex(1), getStateByIndex(2));
try (TraceScope ignored = tracer.newScope("getStats")) {
long[] states = namenode.getStats();
return new FsStatus(getStateAtIndex(states, 0),
getStateAtIndex(states, 1), getStateAtIndex(states, 2));
} catch (RemoteException re) {
throw re.unwrapRemoteException();
}
}
private long getStateAtIndex(long[] states, int index) {
return states.length > index ? states[index] : -1;
}
/**