Shashikant Banerjee created HDFS-16145:
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Summary: CopyListing fails with FNF exception with snapshot diff
Key: HDFS-16145
URL: https://issues.apache.org/jira/browse/HDFS-16145
Project: Hadoop HDFS
Issue Type: Bug
Components: distcp
Reporter: Shashikant Banerjee
Assignee: Shashikant Banerjee
Distcp with snapshotdiff and with filters, marks a Rename as a delete opeartion
on the target if the rename target is to a directory which is exluded by the
filter. But, in cases, where files/subdirs created/modified prior to the Rename
post the old snapshot will still be present as modified/created entries in the
final copy list. Since, the parent diretory is marked for deletion, these
subsequent create/modify entries should be ignored while building the final
copy list.
With such cases, when the final copy list is built, distcp tries to do a lookup
for each create/modified file in the l\newer snapshot which will fail as, the
parent dir is already moved to a new location in later snapshot.
{code:java}
sudo -u kms hadoop key create testkey
hadoop fs -mkdir -p /data/gcgdlknnasg/
hdfs crypto -createZone -keyName testkey -path /data/gcgdlknnasg/
hadoop fs -mkdir -p /dest/gcgdlknnasg
hdfs crypto -createZone -keyName testkey -path /dest/gcgdlknnasg
hdfs dfs -mkdir /data/gcgdlknnasg/dir1
hdfs dfsadmin -allowSnapshot /data/gcgdlknnasg/
hdfs dfsadmin -allowSnapshot /dest/gcgdlknnasg/
[root@nightly62x-1 logs]# hdfs dfs -ls -R /data/gcgdlknnasg/
drwxrwxrwt - hdfs supergroup 0 2021-07-16 14:05
/data/gcgdlknnasg/.Trash
drwxr-xr-x - hdfs supergroup 0 2021-07-16 13:07
/data/gcgdlknnasg/dir1
[root@nightly62x-1 logs]# hdfs dfs -ls -R /dest/gcgdlknnasg/
[root@nightly62x-1 logs]#
hdfs dfs -put /etc/hosts /data/gcgdlknnasg/dir1/
hdfs dfs -rm -r /data/gcgdlknnasg/dir1/
hdfs dfs -mkdir /data/gcgdlknnasg/dir1/
===> Run BDR with “Abort on Snapshot Diff Failures” CHECKED now in the
replication schedule. You get into below error and failure of the BDR job.
21/07/16 15:02:30 INFO distcp.DistCp: Failed to use snapshot diff -
java.io.FileNotFoundException: File does not exist:
/data/gcgdlknnasg/.snapshot/distcp-5-46485360-new/dir1/hosts
at
org.apache.hadoop.hdfs.DistributedFileSystem$29.doCall(DistributedFileSystem.java:1494)
at
org.apache.hadoop.hdfs.DistributedFileSystem$29.doCall(DistributedFileSystem.java:1487)
……..
{code}
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