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  1. HBase
  2. HBASE-18397 StoreFile accounting issues on branch-1.3 and branch-1
  3. HBASE-18399

Files in a snapshot can go missing even after the snapshot is taken successfully

    Details

    • Type: Sub-task
    • Status: Resolved
    • Priority: Major
    • Resolution: Duplicate
    • Affects Version/s: None
    • Fix Version/s: None
    • Component/s: regionserver, Scanners
    • Labels:
      None

      Description

      Files missing after the snapshot is taken (only applicable when the TTL for the TimeToLiveHFileCleaner is small, like the default 5 mins)

      • SnapshotManifest#addRegion visits store_file_A, but is yet to write it to the manifest.
      • store_file_A is marked as compacted away and HFileArchiver moves the file to archive.
      • HFileCleaner comes in and sees the store_file_A in archive. It adds the file to the list of files that might need to be cleaned up.
      • HFileCleaner's SnapshotHFileCleaner plugin is kicked in.
      • SnapshotFileCache#getUnreferencedFiles also says that store_file_A is unreferenced and should be cleaned up (It has not yet been written to the manifest).
      • SnapshotHFileCleaner is still going through rest of the files in archive.
      • store_file_A reference is created and written to snapshot manifest.
      • Snapshot verification runs and sees the store_file_A is present in archive, and thus the verification passes.
      • Now, the SnapshotHFileCleaner finishes and TimeToLiveHFileCleaner is triggered. If TTL has passed since the store_file_A was moved to archive (SnapshotHFileCleaner could take easily several minutes to go through rest of the files), the TimeToLiveHFileCleaner also marks the file as deletable.
      • Since all cleaner plugins marked file as deletable, the store_file_A is deleted.

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              • Assignee:
                ashu210890 Ashu Pachauri
                Reporter:
                ashu210890 Ashu Pachauri
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                Dates

                • Created:
                  Updated:
                  Resolved: