| DESCRIPTION OF ENHANCEMENTS |
Associated Patches: This patch requires that KIDS build HL*1.6*77 be
ISH-0900-40469 re-transmissions for a message awaiting an ack
(Note that links that do not have "autostart" enabled will need
to be restarted manually.)
AXP/DSM SITES ONLY: If you previously disabled an HL7 UCX Service
for this installation, you may enable it now.
7. AXP/DSM Sites: After the patch has been installed, rebuild your
map set, if necessary.
8. Start Link Manager using the 'TCP Link Manager Start/Stop [HL
START/STOP LINK MANAGER]' menu option.
This patch fixes the problem where a TCP client logical link and its
corresponding listener logical link lose synchronization. Loss of
synchronization creates excessive retransmission of messages and their
acknowledgements, causing side effects: one is that the client link gets
stuck in a "Reading" state because its TCP receive buffer fills up;
another is that the disk on both the sending and the receiving sides
fills up at a faster rate.
installed.
This patch makes corrections in the way the TCP client logical link
retransmits a message when its corresponding acknowledgement does not
arrive in time or receives an incorrect acknowledgement. Previous HL7
code allowed the logical link to retransmit a message when the
acknowledgement message was incorrect, including an "incorrect msg id"
acknowledgement. This patch corrects the code to allow retransmission of
a message only when the logical link does not receive an acknowledgement
in time (timed out) and ignores incorrect acknowledgements.
Routine Information:
=====================
The following routine is included in this patch. The second line of the
routine now looks like this:
;;1.6;HEALTH LEVEL SEVEN;**19,43,49,57,63,64,66,67,76,77,87**;JUL 17,1995.
The VA Kernel checksums for this routine (calculated using
CHECK^XTSUMBLD) are listed below:
Test sites: Oklahoma City VAMC, Muskogee VAMC, San Francisco VAMC
Routine Checksum Checksum
Name Before Patch After Patch
======== ============ ===========
HLCSTCP2 12129232 12913767
Patch List
=====================
**19,43,49,57,63,64,66,67,76,77,87**;
Sites should use CHECK^XTSUMBLD to verify checksums after the patch
has been installed.
Installation Instructions:
==========================
1. Users are allowed to be on the system during the installation.
2. AXP/DSM SITES: Review your mapped routine set. If any of the
routines listed in the ROUTINE SUMMARY section are mapped, they
should be removed from the mapped set at this time.
NOIS: OKL-1201-70586 VA* Logical Links not transmitting
3. Shutdown all Logical Links, incoming and outgoing filers, and
the Link Manager using the Filer and Link Management options
listed below:
Stop All Messaging Background Processes [HL STOP ALL]
TCP Link Manager Start/Stop [HL START/STOP LINK MANAGER]
AXP/DSM SITES ONLY: Disable all HL7 UCX Services for this
installation.
ISF-0700-62124 Duplicate Entries for messages
4. Use the 'INSTALL/CHECK MESSAGE' option on the PackMan menu. This
option will load the KIDS package onto your system.
5. This patch is now loaded into a transport global on your
system. The next step is to use KIDS to install the Transport
global. To do this, use the 'Installation [XPD INSTALLATION
MENU]' menu. You should use each of the following 'Installation'
menu options in the order shown below:
SDC-0301-60090 Message stuck in 'Awaiting ACK' status
Verify Checksums in Transport Global
Print Transport Global
Compare Transport Global to Current System
Backup a Transport Global
Install Package(s)
When using the 'Install Package(s)' menu option to install
the patch build, you will be asked several questions. The
questions asked, and the answers you should supply, are
shown below.
ISF-0400-62120 Excessive Retransmissions
INSTALL NAME: <HL*1.6*87>
Want KIDS to INHIBIT LOGONS during the install? <NO>
Want to DISABLE Scheduled Options, Menu Options, and
Protocols? <NO>
6. Start up all Logical Links and incoming and outgoing filers using
the Filer and Link Management Option's 'Restart/Start All Links
and Filers [HL TASK RESTART]' menu option.
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