If the source Extract process crashes while writing, it may leave a "short" record at the end of the trail file that lacks the necessary closing tokens.
Host trail files on stable, high-performance filesystems to reduce the risk of I/O related corruption. OGG-01184 - Oracle GoldenGate Error Messages ogg-01184 expected 4 bytes but got 0 bytes in trail
Expected {3,number,0} bytes, but got {4,number,0} bytes, in trail {0}, seqno {1,number,0}, reading record trailer token at RBA {2, Oracle Help Center Extract & Pump Abends - Oracle Communities If the source Extract process crashes while writing,
The "expected 4 bytes but got 0" condition signifies that the GoldenGate process reached a Relative Byte Address (RBA) where it expected to find metadata, but instead encountered the end of the file. Ensure the dirdat directory has enough space to
Ensure the dirdat directory has enough space to prevent partial writes.
This is the most common cause. A trail file may be corrupted due to underlying disk issues, filesystem failures, or an abrupt system shutdown that prevented the Extract from properly closing the file.