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From GitBox <...@apache.org>
Subject [GitHub] [hadoop] imbajin commented on a change in pull request #2265: HDFS-15551. Tiny Improve for DeadNode detector
Date Wed, 02 Sep 2020 02:12:07 GMT

imbajin commented on a change in pull request #2265:
URL: https://github.com/apache/hadoop/pull/2265#discussion_r481554949

File path: hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/DFSInputStream.java
@@ -181,6 +181,8 @@ private boolean isPeriodicRefreshEnabled() {
   private byte[] oneByteBuf; // used for 'int read()'
   protected void addToLocalDeadNodes(DatanodeInfo dnInfo) {
+    DFSClient.LOG.debug("Add {} to local dead nodes, previously was {}",

Review comment:
       1. From the statistics of the production environment, the log output of local `deadnode`
information is too few, so that it is troublesome to find the problem reason, now add it as
   2. The reason to use the `DEBUG` log level is to separate from the `INFO` log level of
the detector, and the impact is small.
   3. Remove logs can be added at the same time(I think both are OK). It was not added before
considering that the local dead node removal method will almost never be called, unless the
detector is turned on and then called, and there is already log output there.

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