LightWave Server: Issue with dictionary caching causes excessive filesystem I/O

Summary

An issue with the dictionary cache implementation can cause excessive I/O to the LightWave Filesystem. This can result in request processing delays due to read lock waits on the FS00 file.

Advisory Release Date

Aug 8, 2021

Affected Versions

• All prior to 1.1.2

Fixed Versions

• 1.1.1.3 (hotfix)
• 1.1.2 GA +

Status

A hotfix is available for this issue. Once the hotfix is installed, the issue will no longer occur. This hotfix is for the 1.1.1 release only. If you would like a hotfix prepared for a different version, please open a support case. 

Note that this is a rollup hotfix which includes these previous 1.1.1 hotfixes:

• 1.1.1.1 - JSON response is serialized incorrectly when multiple HTTP Response Body mappings are defined
• 1.1.1.2 - BLOB request returns HTTP error 415 - Unsupported Media Type

Hotfix Installation

Install the hotfix by following these steps:

1. Download the hotfix PAK file using the link below and transfer the file to your NonStop system using binary transfer mode.
   • For TNS/X: HF1113X
   • For TNS/E: HF1113E
2. Unpak the hotfix PAK file, which contains the following files:
   • SERVER - The SERVER program file.
   • SWORKER - The SWORKER program file.
3. Stop any existing SERVER, SWORKER processes.
4. Replace the existing program files with the hotfix program files.
5. Restart the SERVER & SWORKER processes.

The VPROC for this hotfix is:

• TNS/X - T0000L06_08AUG2021_NuWave_LWS_1_1_1_3_H_f107fa2
• TNS/E - T0000H06_08AUG2021_NuWave_LWS_1_1_1_3_H_f107fa2