{"record":{"id":"33af48a57d2f9100","repo":"influxdata/influxdb","slug":"lost-backend","errorCode":null,"errorMessage":"lost backend","messagePattern":"lost backend","errorType":"exception","errorClass":"Error","httpStatus":null,"severity":"error","filePath":"influxdb3/src/commands/serve.rs","lineNumber":153,"sourceCode":"    #[error(\"Write buffer error: {0}\")]\n    WriteBuffer(#[from] influxdb3_write::write_buffer::Error),\n\n    #[error(\"invalid token: {0}\")]\n    InvalidToken(#[from] hex::FromHexError),\n\n    #[error(\"failed to initialize write buffer: {0:?}\")]\n    WriteBufferInit(#[source] anyhow::Error),\n\n    #[error(\"failed to initialize catalog: {0}\")]\n    InitializeCatalog(#[source] CatalogError),\n\n    #[error(\"failed to initialize last cache: {0}\")]\n    InitializeLastCache(#[source] last_cache::Error),\n\n    #[error(\"failed to initialize distinct cache: {0:#}\")]\n    InitializeDistinctCache(#[source] influxdb3_cache::distinct_cache::ProviderError),\n\n    #[error(\"lost backend\")]\n    LostBackend,\n\n    #[error(\"lost HTTP/gRPC service\")]\n    LostHttpGrpc,\n\n    #[error(\"lost admin token recovery service\")]\n    LostAdminTokenRecovery,\n\n    #[error(\"tls requires both a cert and a key file to be passed in to work\")]\n    NoCertOrKeyFile,\n\n    #[error(\"table cache index initialization failed: {0}\")]\n    TableIndexCacheInitialization(\n        #[source] influxdb3_write::table_index_cache::TableIndexCacheError,\n    ),\n\n    #[error(\n        \"environment variable {0} (named by --node-id-from-env / INFLUXDB3_NODE_ID_FROM_ENV) \\","sourceCodeStart":135,"sourceCodeEnd":171,"githubUrl":"https://github.com/influxdata/influxdb/blob/06200ef96ba82c5f6727e5038a83af8e722c6875/influxdb3/src/commands/serve.rs#L135-L171","documentation":"Display message of the `Error::LostBackend` variant, a source-less error signaling that the server's write/serve backend handle was dropped or became unavailable while the process was still trying to use it. It indicates an internal lifecycle/invariant violation rather than an external failure.","triggerScenarios":"The background server task completes or its backend component is dropped unexpectedly, and subsequent code attempts to use the now-gone backend during `influxdb3 serve`.","commonSituations":"A panic or early return in the server task causing the backend channel/handle to close; shutdown races where the process exits while another task still holds a reference.","solutions":["Check for panics or aborted tasks earlier in the server logs — this error is a downstream symptom","Report with logs/version if reproducible; this usually indicates an internal bug","Upgrade to a newer influxdb3 build where shutdown races may be fixed","Avoid sending external shutdown signals mid-operation until graceful shutdown completes"],"exampleFix":null,"handlingStrategy":"try-catch","validationCode":null,"typeGuard":null,"tryCatchPattern":"match serve_result {\n    Err(Error::LostBackend) => eprintln!(\"server backend terminated unexpectedly; check earlier panics\"),\n    ...\n}","preventionTips":["Avoid abrupt SIGKILL during operation","Watch for and report panics in server tasks","Keep the binary up to date for lifecycle-race fixes"],"tags":["rust","internal","lifecycle","shutdown"],"backgroundTag":"internal-invariant-violation","analyzedSha":"06200ef96ba82c5f6727e5038a83af8e722c6875","analyzedAt":"2026-09-19T12:55:30.003Z","contentChangedAt":"2026-09-19T12:55:30.003Z","schemaVersion":2},"datasetVersion":"2026-09-23T08:17:48.524Z"}