[HDDS-2692] Seek to file end throws EOF Exception

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 0.5.0
• Labels: pull-request-available
• Assignee: Ayush Saxena
• Reporter: Ayush Saxena
• Created: 07/Dec/19 20:08
• Updated: 24/Feb/20 20:56
• Resolved: 08/Dec/19 03:44

Description

Seek to File Length position throws EOF.
Seeks by default should throw EOF past FileLength, not at file length position.

Even in DFSInputStream it throws EOF above FileLength :

  public synchronized void seek(long targetPos) throws IOException {
    if (targetPos > getFileLength()) {
      throw new EOFException("Cannot seek after EOF");
    }

Due to this behaviour EOF is shown as part of tail command too.

ayush@ayushpc:~/ozone/hadoop-ozone/hadoop-ozone/dist/target/ozone-0.5.0-SNAPSHOT/bin$ ./ozone fs -tail -f /file
2019-12-08 01:21:34,088 [main] INFO impl.MetricsConfig: Loaded properties from hadoop-metrics2.properties
2019-12-08 01:21:34,137 [main] INFO impl.MetricsSystemImpl: Scheduled Metric snapshot period at 10 second(s).
2019-12-08 01:21:34,137 [main] INFO impl.MetricsSystemImpl: XceiverClientMetrics metrics system started
Test
tail: EOF encountered at pos: 5 for key: file

Issue Links

• breaks: HDDS-2786 ITestOzoneContractSeek zero byte file failures
• links to: GitHub Pull Request #326