omalley commented on code in PR #5322:
URL: https://github.com/apache/hadoop/pull/5322#discussion_r1120765825
##########
hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/DFSInputStream.java:
##########
@@ -955,6 +965,10 @@ private DNAddrPair chooseDataNode(LocatedBlock block,
}
}
+ /**
+ * RefetchLocations should only be called when there are no active requests
+ * to datanodes. In the hedged read case this means futures should be empty
+ */
Review Comment:
Thanks for adding the javadoc, but you should document the parameters too.
(Especially the modification of ignoredNodes.)
##########
hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/DFSInputStream.java:
##########
@@ -197,6 +197,15 @@ private void clearLocalDeadNodes() {
deadNodes.clear();
}
+ /**
+ * Clear list of ignored nodes used for hedged reads.
+ */
+ private void clearIgnoredNodes(Collection<DatanodeInfo> ignoredNodes) {
Review Comment:
If you are going to do that, I'd just expand the clearIgnoredNodes into it.
Do make sure to call out in the javadoc that you are clearing the passed in
list.
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