Manoj Govindassamy created HDFS-11911:
-----------------------------------------
Summary: SnapshotDiff should maintain the order of file/dir
creation and deletion
Key: HDFS-11911
URL: https://issues.apache.org/jira/browse/HDFS-11911
Project: Hadoop HDFS
Issue Type: Improvement
Components: hdfs, snapshots
Affects Versions: 3.0.0-alpha1
Reporter: Manoj Govindassamy
Assignee: Manoj Govindassamy
{{DirectoryWithSnapshotFeature}} maintains a separate list for CREATED and
DELETED children but the ordering of these creation and deletion events are not
maintained. Assume a case like below, where the time is growing downwards...
{noformat}
|
+ CREATE File-1
|
+ Snap S1 created
|
+ DELETE File-1
|
+ Snap S2 created
|
+ CREATE File-1
|
+ Snap S3 created
|
|
V
{noformat}
The snapshot diff report which takes in the DirectoryWithSnapshotFeature diff
entries and just prints all the creation first and then the deletions, thereby
giving the perception that file-1 got created first and then got deleted. But
after S3, file-1 is still available.
{noformat}
The difference between snapshot S1 and snapshot S3 under the directory /:
M .
+ ./file-1
- ./file-1
{noformat}
Can we have DirectoryWithSnapshotFeature maintain the diff entries ordered by
time or sequence?
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