Daisuke Kobayashi created HDFS-14315: ----------------------------------------
Summary: 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 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. {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. -- This message was sent by Atlassian JIRA (v7.6.3#76005) --------------------------------------------------------------------- To unsubscribe, e-mail: hdfs-issues-unsubscr...@hadoop.apache.org For additional commands, e-mail: hdfs-issues-h...@hadoop.apache.org