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Description When initializing the OpenTelemetry Android SDK with disk buffering enabled, we discovered that synchronous disk space checks were causing ANRs in production. These checks occur during the creation of disk buffering exporters, specifically in `DiskManager.getMaxFolderSize()`, which makes blocking IPC calls through `StorageManager.getAllocatableBytes()` on the main thread. The issue manifests in the following ANR stacktrace: ``` android.os.BinderProxy.transact (BinderProxy.java:662) android.os.storage.IStorageManager$Stub$Proxy.getAllocatableBytes (IStorageManager.java:2837) android.os.storage.StorageManager.getAllocatableBytes (StorageManager.java:2414) android.os.storage.StorageManager.getAllocatableBytes (StorageManager.java:2404) io.opentelemetry.android.internal.services.CacheStorage.getAvailableSpace (CacheStorage.java:66) io.opentelemetry.android.internal.services.CacheStorage.ensureCacheSpaceAvailable (CacheStorage.java:50) io.opentelemetry.android.internal.features.persistence.DiskManager.getMaxFolderSize (DiskManager.kt:58) io.opentelemetry.android.OpenTelemetryRumBuilder.createStorageConfiguration (OpenTelemetryRumBuilder.java:338) io.opentelemetry.android.OpenTelemetryRumBuilder.build (OpenTelemetryRumBuilder.java:286) ``` Our Solution To fix this we moved initialization to run on a background executor and buffer the data in memory until it completes. The process works like this: 1. Initialize the SDK with `BufferDelegatingExporter` instances that can immediately accept telemetry data. 2. Move exporter initialization off the main thread. 3. Once async initialization completes, flush buffered signals to initialized exporters and delegate all future signals. The primary goal of this solution is to be unobtrusive and prevent ANRs caused by initialization of disk exporters, while preventing signals from being dropped. Testing We have added unit tests to cover the buffering, delevation, and RUM building. We've also verified this with both disk enabled and disk disabled.
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Ejdangerfield
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