{"record":{"id":"652aecfbcda930a0","repo":"influxdata/influxdb","slug":"failed-to-initialize-last-cache-0","errorCode":null,"errorMessage":"failed to initialize last cache: {0}","messagePattern":"failed to initialize last cache: (.+?)","errorType":"exception","errorClass":"Error","httpStatus":null,"severity":"error","filePath":"influxdb3/src/commands/serve.rs","lineNumber":147,"sourceCode":"    #[error(\"Server error: {0}\")]\n    Server(#[source] influxdb3_server::Error),\n\n    #[error(\"Token error: {0}\")]\n    TokenError(CatalogError),\n\n    #[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}\")]","sourceCodeStart":129,"sourceCodeEnd":165,"githubUrl":"https://github.com/influxdata/influxdb/blob/06200ef96ba82c5f6727e5038a83af8e722c6875/influxdb3/src/commands/serve.rs#L129-L165","documentation":"Display message of the `Error::InitializeLastCache` variant, wrapping a `last_cache::Error` (#[source]) from constructing the last-N-values cache at startup. The last cache is optional per-table, so failure typically comes from invalid cache configuration for a table.","triggerScenarios":"A configured last cache (e.g. from a cached `CREATE LAST CACHE` spec replayed at startup) fails to build because its columns, TTL, or count settings are invalid for the table's current schema.","commonSituations":"A table's schema changed (column renamed/removed) after a last cache was created, so the stored cache spec no longer matches; or invalid cache size/TTL values.","solutions":["Read the wrapped last_cache::Error to see which cache spec failed","Drop and recreate the offending last cache against the current table schema","Verify cached column names still exist in the table schema","Adjust cache count/TTL parameters to valid values"],"exampleFix":"// before\nCREATE LAST CACHE ON \"mytable\"(Name) ; -- column removed from schema\n// after\nDROP LAST CACHE ON \"mytable\";\nCREATE LAST CACHE ON \"mytable\"(host) ; -- column that exists in current schema","handlingStrategy":"validation","validationCode":"-- before starting, verify each last-cache spec's columns exist:\n-- SHOW CREATE TABLE / check schema vs cached column names","typeGuard":null,"tryCatchPattern":"match serve_result {\n    Err(Error::InitializeLastCache(src)) => eprintln!(\"last cache init failed: {src}\"),\n    ...\n}","preventionTips":["Drop stale caches before renaming/removing columns","Recreate caches after schema migrations","Keep cache count/TTL values within valid ranges"],"tags":["rust","cache","startup","schema"],"backgroundTag":"module-init-failed","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"}