[DERBY-6456] Infinite loop in NetworkServerControlImpl when reply >= 32k

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 10.10.1.1
• Fix Version/s: 10.10.2.0, 10.11.1.1
• Component/s: Network Server
• Assignee: Knut Anders Hatlen
• Reporter: Martin JANDA
• Created: 13/Jan/14 17:01
• Updated: 21/Jan/15 00:23
• Resolved: 22/Jan/14 13:11

Description

When size of reply in NetworkServerControlImpl equals to 32k (max size for short) ensureDataInBuffer is in infinite loop. clientIs.read(..., replyBuffer.length - replyBufferCount) return 0 because 'replyBuffer.length - replyBufferCount' is 0 (bytes to read).

Steps to reproduce:
Open many connections (for me 34) with at least 1 SELECT query. and call getRuntimeInfo(). Runtime info string.length > 32kB. Leading to infinite loop.

Issue Links

• relates to: DERBY-5220 Output from org.apache.derby.drda.NetworkServerControl runtimeinfo are truncated if the amount of data exceeds some threshold
• relates to: DERBY-6455 Infinite loop in NetworkServerControlImpl.ensureDataInBuffer
• relates to: DERBY-5236 Client driver silently truncates strings that exceed 32KB