[DERBY-1454] DRDA Protocol Exception when DSS is exactly 32767 in length

• Type: Sub-task
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 10.1.3.1, 10.2.1.6
• Fix Version/s: 10.1.3.1, 10.2.1.6
• Component/s: Network Server
• Issue & fix info: Release Note Needed
• Assignee: Bryan Pendleton
• Reporter: Bryan Pendleton
• Created: 25/Jun/06 00:54
• Updated: 30/Jun/09 16:12
• Resolved: 26/Jun/06 00:17

Description

The server is disconnecting the client connection. Client is sending a CNTQRY, the server is receiving it
and then server disconnects the client. When I start the server, after a while, I see the message
agentThread[DRDAConnThread_4,5,main].

Further debugging, this message gets printed out because of the agentError that is thrown in splitQRYDTA.

The error seems to come from this part of the code in splitQRYDTA, It hits the temp.length==0 case.

private void splitQRYDTA(DRDAStatement stmt, int blksize) throws SQLException,
DRDAProtocolException

{ // make copy of extra data byte [] temp = writer.copyDSSDataToEnd(blksize); // truncate to end of blocksize writer.truncateDSS(blksize); if (temp.length == 0) agentError("LMTBLKPRC violation: splitQRYDTA was " + "called to split a QRYDTA block, but the " + "entire row fit successfully into the " + "current block. Server rowsize computation " + "was probably incorrect (perhaps an off-by-" + "one bug?). QRYDTA blocksize: " + blksize); stmt.setSplitQRYDTA(temp); }

In doneData and writeFDODTA, it looks like if (writer.getDSSLength() >= blksize) , then the splitQRYDTA
is called. From testing, it seems like they are hitting an edge case, where the writer.getDSSLength()
is equal to blksize and this DSS is the only dss in the send buffer.