shahrs87 commented on a change in pull request #4003:
URL: https://github.com/apache/hbase/pull/4003#discussion_r778831645
##########
File path:
hbase-mapreduce/src/main/java/org/apache/hadoop/hbase/mapreduce/WALPlayer.java
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@@ -344,6 +345,9 @@ public Job createSubmittableJob(String[] args) throws
IOException {
try {
TableMapReduceUtil.addDependencyJarsForClasses(job.getConfiguration(),
Class.forName(codecCls));
+ // get delegation token for the filesystem
+ TokenCache.obtainTokensForNamenodes(job.getCredentials(), new Path[] {
new Path(inputDirs) },
Review comment:
@mymeiyi
We do get credentials from namenode
[here](https://github.com/apache/hadoop/blob/trunk/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapreduce/JobSubmitter.java#L170)
I don't know much about WALPlayer internals. Does this MR job access 2
different namenodes ?
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