AbyssFishRover created KAFKA-20024:
--------------------------------------
Summary: wmic os get osarchitecture is unreliable for detecting OS
bitness in bat scripts
Key: KAFKA-20024
URL: https://issues.apache.org/jira/browse/KAFKA-20024
Project: Kafka
Issue Type: Bug
Reporter: AbyssFishRover
Assignee: AbyssFishRover
Attachments: image-2025-12-30-16-27-52-195.png,
image-2025-12-30-16-28-25-539.png, image-2025-12-30-16-28-42-798.png,
image-2025-12-30-16-29-03-343.png, image-2025-12-30-16-29-19-289.png,
image-2025-12-30-16-29-36-542.png
Hello，During my usage of Kafka, I identified an issue. In the
{{kafka-server-start.bat}} script, there is a logic that sets different startup
parameters based on the bitness (32-bit/64-bit) of the operating system. The
relevant code is as follows:
{code:java}
IF ["%KAFKA_HEAP_OPTS%"] EQU [""] (
rem detect OS architecture
wmic os get osarchitecture | find /i "32-bit" >nul 2>&1
IF NOT ERRORLEVEL 1 (
rem 32-bit OS
set KAFKA_HEAP_OPTS=-Xmx512M -Xms512M
) ELSE (
rem 64-bit OS
set KAFKA_HEAP_OPTS=-Xmx1G -Xms1G
)
) {code}
It first queries wmic os get osarchitecture, then determines whether the
operating system is 32-bit or 64-bit by checking if the result contains the
string "32-bit". However, my actual tests show that this method is not
reliable—the returned results vary across Windows systems with different
languages and regional settings, as shown below:
{*}English Windows{*}:
!image-2025-12-30-16-27-52-195.png!
{*}Chinese Windows{*}:
!image-2025-12-30-16-28-25-539.png!
{*}French Windows{*}:
!image-2025-12-30-16-28-42-798.png!
{*}German Windows{*}:
!image-2025-12-30-16-29-03-343.png!
{*}Japanese Windows{*}:
*!image-2025-12-30-16-29-19-289.png!*
{*}Older Windows XP systems{*}:
!image-2025-12-30-16-29-36-542.png!
Kafka has users across the globe, and the current approach {*}lacks
universality{*}.
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