From 8c9bd914462970dea77749f14a901da19287b9fc Mon Sep 17 00:00:00 2001
From: Antoine Pitrou <antoine@python.org>
Date: Wed, 9 Sep 2026 13:19:18 +0200
Subject: [PATCH] MINOR: [C++][CI] Bump ccache max size

When trying to analyze the compilation caching behavior on https://github.com/apache/arrow/pull/51255, I realized that our maximum ccache size of 1GB had become too small for some builds. The result is that a single build cannot be cached in its entirety, making identical rebuilds costlier than they should be.
---
 ci/scripts/ccache_setup.sh | 2 +-
 compose.yaml               | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/ci/scripts/ccache_setup.sh b/ci/scripts/ccache_setup.sh
index 4006a63a7396..4a0f4020cd90 100755
--- a/ci/scripts/ccache_setup.sh
+++ b/ci/scripts/ccache_setup.sh
@@ -25,6 +25,6 @@ set -eux
   echo "CCACHE_COMPILERCHECK=content"
   echo "CCACHE_COMPRESS=1"
   echo "CCACHE_COMPRESSLEVEL=6"
-  echo "CCACHE_MAXSIZE=1G"
+  echo "CCACHE_MAXSIZE=1.5G"
   echo "CCACHE_NOHASHDIR=1"
 } >> "$GITHUB_ENV"
diff --git a/compose.yaml b/compose.yaml
index 5cf62a13aa20..28237427ff5a 100644
--- a/compose.yaml
+++ b/compose.yaml
@@ -57,7 +57,7 @@ x-ccache: &ccache
   CCACHE_COMPILERCHECK: content
   CCACHE_COMPRESS: 1
   CCACHE_COMPRESSLEVEL: 6
-  CCACHE_MAXSIZE: 1G
+  CCACHE_MAXSIZE: 1.5G
   CCACHE_DIR: /ccache
   # Some builds (such as PyArrow) copy their source files in a temporary directory,
   # avoid hashing the current directory to make ccache useful on those builds.