[HDFS-7056] Snapshot support for truncate

• Type: Sub-task
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 3.0.0-alpha1
• Fix Version/s: 2.7.0
• Component/s: namenode
• Hadoop Flags: Reviewed
• Assignee: Plamen Jeliazkov
• Reporter: Konstantin Shvachko
• Created: 12/Sep/14 19:03
• Updated: 16/Oct/17 13:18
• Resolved: 13/Jan/15 09:00

Description

Implementation of truncate in HDFS-3107 does not allow truncating files which are in a snapshot. It is desirable to be able to truncate and still keep the old file state of the file in the snapshot.

Issue Links

• duplicates: HDFS-7809 Block and lease recovery failure caused by snapshot issue
• relates to: HDFS-12638 Delete copy-on-truncate block along with the original block, when deleting a file being truncated
• relates to: HDFS-7831 Fix the starting index and end condition of the loop in FileDiffList.findEarlierSnapshotBlocks()
• requires: HDFS-7263 Snapshot read can reveal future bytes for appended files.