[#BloombergLP-ball-FileObserver2-rotateOnSize]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/ball.adoc[ball]::xref:BloombergLP/ball/FileObserver2.adoc[FileObserver2]::rotateOnSize
:relfileprefix: ../../../
:mrdocs:

Set this file observer to perform log file rotation when the size of the file exceeds the specified `size` (in kilobytes). This rule replaces any rotation‐on‐size rule currently in effect. The behavior is undefined unless `size > 0`.

== Synopsis

Declared in `<ball_fileobserver2.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
void
rotateOnSize(int size);
----


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