Chao Sun created HDFS-12932:
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Summary: Confusing LOG message for block replication
Key: HDFS-12932
URL: https://issues.apache.org/jira/browse/HDFS-12932
Project: Hadoop HDFS
Issue Type: Improvement
Components: hdfs
Affects Versions: 2.8.3
Reporter: Chao Sun
Assignee: Chao Sun
Priority: Minor
In our cluster we see large number of log messages such as the following:
{code}
2017-12-15 22:55:54,603 INFO
org.apache.hadoop.hdfs.server.namenode.FSDirectory: Increasing replication from
3 to 3 for <HDFS file>
{code}
This is a little confusing since "from 3 to 3" is not "increasing". Digging
into it, it seems related to this piece of code:
{code}
if (oldBR != -1) {
if (oldBR > targetReplication) {
FSDirectory.LOG.info("Decreasing replication from {} to {} for {}",
oldBR, targetReplication, iip.getPath());
} else {
FSDirectory.LOG.info("Increasing replication from {} to {} for {}",
oldBR, targetReplication, iip.getPath());
}
}
{code}
Perhaps a {{oldBR == targetReplication}} case is missing?
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