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From "George Huang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-11912) Add a snapshot unit test with randomized file IO operations
Date Sat, 03 Jun 2017 00:08:04 GMT

    [ https://issues.apache.org/jira/browse/HDFS-11912?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16035663#comment-16035663
] 

George Huang commented on HDFS-11912:
-------------------------------------

10.
  /** Delete an existing test directory */
  private void deleteTestDir() throws IOException {
    if (snapshottableDirectories.size() > 0) {
      int index = GENERATOR.nextInt(snapshottableDirectories.size());
      Path deleteDir = snapshottableDirectories.get(index);

      if (!pathToSnapshotsMap.containsKey(deleteDir)) {
           .. .. // deletion
      }
deleteTestDir and renameTestDir have the above model where the deletion or rename task is
only performed when directory does not exist in pathToSnapshotsMap. But, pathToSnapshotsMap
will always have this home dir after the first snapshot created. So, deletions and renames
will always be skipped after the first snapshot taken?

=> See response above. pathTosnapshotsMap will have multile entries as snapshottableDirectory
will have multiple entries (size() > 0) as explained earlier. This was verified by multiple
local runs.

Many thanks!

> Add a snapshot unit test with randomized file IO operations
> -----------------------------------------------------------
>
>                 Key: HDFS-11912
>                 URL: https://issues.apache.org/jira/browse/HDFS-11912
>             Project: Hadoop HDFS
>          Issue Type: Test
>          Components: hdfs
>            Reporter: George Huang
>            Priority: Minor
>         Attachments: HDFS-11912.001.patch
>
>
> Adding a snapshot unit test with randomized file IO operations.



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