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Troubleshooting Slow Uploads

The Build Event Protocol upload timed out#

This error means the bes_timeout flag is likely set to a value that's not long enough for bazel to finish uploading all build artifacts.

We recommend using the following flag to increase this upload timeout:


These slow uploads should only happen once when artifacts are initially written to the cache, and shouldn't happen on subsequent builds.

Waiting for build events upload#

If your build has finished but you're frequently sitting around waiting for build events to upload - you're likely in a network constrained environment trying to upload large build artifacts like docker images or large binaries.

For network constrained environments, we recommend running with the flag:


This will upload build, test, and profiling logs - but not the larger build artifacts that can take much longer to upload.