[LUCENE-957] Lucene RAM Directory doesn't work for Index Size > 8 GB

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Component/s: core/store
• Assignee: Doron Cohen
• Reporter: Doron Cohen
• Created: 12/Jul/07 22:51
• Updated: 28/Aug/22 11:39
• Resolved: 19/Jul/07 16:51

Description

from user list - http://www.gossamer-threads.com/lists/lucene/java-user/50982

Problem seems to be casting issues in RAMInputStream.

Line 90:
bufferStart = BUFFER_SIZE * currentBufferIndex;
both rhs are ints while lhs is long.
so a very large product would first overflow MAX_INT, become negative, and only then (auto) casted to long, but this is too late.

Line 91:
bufferLength = (int) (length - bufferStart);
both rhs are longs while lhs is int.
so the (int) cast result may turn negative and the logic that follows would be wrong.