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https://issues.apache.org/jira/browse/HDFS-14315?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16790679#comment-16790679
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Istvan Fajth commented on HDFS-14315:
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Also this might be related to HDFS-11146 but I am not 100% sure on that either
again, limited knowledge about block replica states... :S
> Add more detailed log message when decreasing replication factor < max in
> snapshots
> -----------------------------------------------------------------------------------
>
> Key: HDFS-14315
> URL: https://issues.apache.org/jira/browse/HDFS-14315
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: hdfs
> Affects Versions: 3.1.2
> Reporter: Daisuke Kobayashi
> Assignee: Daisuke Kobayashi
> Priority: Minor
> Attachments: HDFS-14315.000.patch, HDFS-14315.001.patch
>
>
> When changing replication factor for a given file, the following 3 types of
> logging appear in the namenode log, but more detailed message would be useful
> especially when the file is in snapshot(s).
> {noformat}
> Decreasing replication from X to Y for FILE
> Increasing replication from X to Y for FILE
> Replication remains unchanged at X for FILE
> {noformat}
> I have added additional log messages as well as further test scenarios to
> org.apache.hadoop.hdfs.server.namenode.snapshot.TestSnapshotReplication#testReplicationWithSnapshot.
> The test sequence is:
> 1) A file is created with replication factor 1 (there are 5 datanodes)
> 2) Take a snapshot and increase the factor by 1. Continue this loop up to 5.
> 3) Setrep back to 3, but the target replication is decided to 4, which is the
> maximum in snapshots.
> {noformat}
> 2019-02-25 17:17:26,800 [IPC Server handler 9 on default port 55726] INFO
> namenode.FSDirectory (FSDirAttrOp.java:unprotectedSetReplication(408)) -
> Decreasing replication from 5 to 4 for /TestSnapshot/sub1/file1. Requested
> value is 3, but 4 is the maximum in snapshots
> {noformat}
> 4) Setrep to 3 again, but it's unchanged as follows. Both 3) and 4) are
> expected.
> {noformat}
> 2019-02-25 17:17:26,804 [IPC Server handler 6 on default port 55726] INFO
> namenode.FSDirectory (FSDirAttrOp.java:unprotectedSetReplication(420)) -
> Replication remains unchanged at 4 for /TestSnapshot/sub1/file1 . Requested
> value is 3, but 4 is the maximum in snapshots.
> {noformat}
> 5) Make sure the number of replicas in datanodes remains 4.
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