xinglin commented on code in PR #6446:
URL: https://github.com/apache/hadoop/pull/6446#discussion_r1456687729
##########
hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/DFSInputStream.java:
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@@ -786,6 +786,7 @@ private synchronized int readBuffer(ReaderStrategy reader,
int len,
while (true) {
// retry as many times as seekToNewSource allows.
try {
+ DFSClientFaultInjector.get().fetchFromDatanodeException();
Review Comment:
this is used so that in unit test we can inject an error. we will mock
fetchFromDatanodeException() in unit test, to throw IOException.
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