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ERR_KV_READ_FAILED — KV Read Failed

HTTP Status: 500 Retryable: Yes Automatic retry: None. KV read operations are not automatically retried.

What the User Sees

Failed to read data. Please try again. (ERR_KV_READ_FAILED)

What Causes This Error

Cloudflare Workers KV returned an error when attempting to read a key. KV is used throughout the application for file metadata, tags, share tokens, tenant configuration caching, and session data.

KV has eventual consistency by design — edge cache staleness is normal and handled by the application. This error represents an actual infrastructure failure, not a consistency issue. These are rare but can occur during KV namespace outages or regional infrastructure issues.

The error can originate from multiple code paths. Tag operations in routes/tags.ts have try/catch wrappers that produce this error. File metadata reads via getFileMeta in file-list.ts also surface this error when the underlying KV get operation fails.

Resolution Steps

For Users

  1. Refresh the page and try the operation again. KV errors are almost always transient.
  2. If the error occurs when viewing files or tags, your data is not lost — the storage system is temporarily unable to serve it.
  3. If the error persists for more than a few minutes, the service may be experiencing a broader outage.

For Administrators

  1. Check Cloudflare Workers KV status on https://www.cloudflarestatus.com.
  2. Verify KV namespace bindings in wrangler.toml. Ensure all expected KV namespaces are bound:
    • KV_SESSIONS — session and file metadata
    • KV_RATE_LIMIT — rate limiting counters
  3. Test KV health by reading a known key via the Cloudflare dashboard > Workers > KV > select namespace > browse keys.
  4. If the error is isolated to a specific namespace, check whether the namespace was accidentally deleted or misconfigured.
  5. Review Grafana logs for KV error patterns to determine if the issue is widespread or limited to specific operations.