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HDDS-1749 : Ozone Client should randomize the list of nodes in pipeline for reads. (#1124)

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avijayanhwx 2019-07-25 07:54:46 -07:00 committed by bshashikant
parent 62deab17a3
commit ba43233451
1 changed files with 4 additions and 0 deletions
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4
hadoop-hdds/client/src/main/java/org/apache/hadoop/hdds/scm/XceiverClientGrpc.java
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@ -54,6 +54,7 @@
import java.io.File;
import java.io.IOException;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
@ -269,6 +270,9 @@ private XceiverClientReply sendCommandWithRetry(
datanodeList = pipeline.getNodesInOrder();
} else {
datanodeList = pipeline.getNodes();
// Shuffle datanode list so that clients do not read in the same order
// every time.
Collections.shuffle(datanodeList);
}
for (DatanodeDetails dn : datanodeList) {
try {