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InvalidRequestException: invalid request rejected before execution in Cassandra, Hadoop and JuiceFS

InvalidRequestException means a library rejected an operation as invalid before or during execution — a malformed CQL tuple literal or mixed LWT condition in Apache Cassandra, a bad short-circuit slot request or bucket-root delete in Apache Hadoop, or an invalid native parameter in JuiceFS. This guide explains the mechanisms behind the family and how to fix each shape of it.

Distilled from 669 documented records across 3 repositories.

Background

InvalidRequestException is a family of 669 documented records across three repositories: Apache Cassandra (639), Apache Hadoop (29) and JuiceFS (1). Despite the shared class name, the three libraries use it at different layers. In Cassandra it is the standard CQL statement-validation exception, thrown by the query layer when a statement parses but cannot be executed as written. In Hadoop it guards protocol invariants — mostly in the short-circuit shared-memory read path and in the OBS connector's delete guards. In JuiceFS it wraps a negative return from the native library when a call itself was invalid, most commonly a bad or uninitialized filesystem handle.

In Cassandra the exception fires during statement validation, before any data is touched. The best-documented shapes are tuple-literal problems: a tuple literal with more elements than the column's declared tuple type (tuples have fixed arity), or a component whose type does not match the declared component type, since Cassandra performs no implicit coercion. Other validation shapes include mixing lightweight-transaction condition kinds (IF EXISTS with IF col = x) on the same row, and calling time-floor functions with a duration below 1 millisecond precision. All of these are deterministic: the same statement fails every time until the statement or schema changes.

In Hadoop the exception marks bookkeeping mismatches and protocol violations. The short-circuit registry throws it when a slot index is negative, when a slot was never registered or was already unregistered on the receiving side, or when a shmId has no registered shared-memory segment — typically after a restart left one side with stale state. The OBS connector throws it when a delete would target the bucket root itself. JuiceFS's single record is different again: the permission check path throws 'Invalid parameter' when the native call returns a negative result, usually because the filesystem handle was closed or never initialized.

Across the family, severity is almost always recorded as error (664 of 669 records) and handling is dominated by validation (606 records), with try-catch (35), type-guard (18) and small numbers of retry and fallback strategies. Notably, retry is rarely the right answer: Cassandra's validation failures are deterministic, and Hadoop's slot errors usually indicate stale state that must be rebuilt rather than blindly retried — although in Hadoop's short-circuit path, falling back to normal reads after this exception is safe and often automatic.

Common causes

• Malformed tuple literal in CQL.In Cassandra, a tuple literal has more elements than the column's declared tuple type, or a component's value type does not match the declared component type. Cassandra tuples have fixed arity and perform no implicit type coercion.
• Stale short-circuit shared-memory state in Hadoop.A slot registration references a shmId with no registered segment, a slot index that was never registered or already unregistered, or a negative slot index. This typically follows a restart on the other side of the short-circuit read path, leaving cached segment state invalid.
• Mixed lightweight-transaction conditions.Cassandra rejects combining an existence check (IF EXISTS / IF NOT EXISTS) with column-value conditions (IF col = x) on the same primary-key row, because the two condition kinds cannot be evaluated as one atomic predicate.
• Invalid or closed filesystem handle in JuiceFS.The native is-superuser call returns a negative result because the filesystem handle failed to initialize or was closed, so the client throws InvalidRequestException('Invalid parameter') instead of treating the user as non-super. Check earlier logs for a failed init.
• Duration below millisecond precision.Cassandra's time-floor functions require the rounding duration to have at least millisecond precision; sub-millisecond durations such as nanosecond-only values cannot be floored.
• Deleting a bucket root in Hadoop's OBS connector.A delete path decodes to the bucket root (empty or '/' key), so the guard refuses to delete the whole bucket namespace. Cleanup loops that walk parent directories all the way to the root trigger this.
• Version or protocol skew.Mismatched versions between the two ends of Hadoop's short-circuit protocol can make the sides disagree on slot-id encoding, producing invalid slot requests. Similarly, a JuiceFS client jar mismatched with its native library can cause bad native calls.

What usually fixes it

• Validate before you send: check tuple arity and component types against live schema metadata (DESCRIBE TABLE, system_schema.columns, or driver schema metadata), use the driver's typed tuple API, and validate user-supplied durations and parameters in application code before issuing the request.
• Rebuild stale state rather than retrying blindly: discard cached short-circuit segments and re-establish them (or restart long-lived applications) after the other side restarts; in JuiceFS, re-create the FileSystem instance after an init failure instead of reusing it.
• Keep versions matched: run the same release on both ends of Hadoop's short-circuit path and match the JuiceFS client jar with its native library to avoid protocol and ABI mismatches.
• Keep request semantics simple: use at most one LWT condition kind per row and target distinct rows when batching, and add guards so delete or cleanup loops stop at the bucket root instead of producing root-level delete keys.
• Let the fallback work: in Hadoop's short-circuit path, falling back to normal reads after this exception is safe and automatic in most versions — confirm the errors stop rather than pinning dead segments, and escalate persistent cases with full trace logs.

Documented occurrences

• Invalid tuple literal for %s: too many elements. Type %s expects %d but got %d(apache/cassandra)
• {this}: slot {slotIdx} does not exist.(apache/hadoop)
• Invalid parameter(juicedata/juicefs)
• Cannot mix IF conditions and %s for the same row(apache/cassandra)
• Bucket %s cannot be deleted(apache/hadoop)
• The floor cannot be computed for the %s duration as precision is below 1 millisecond(apache/cassandra)
• {this}: invalid negative slot index {slotIdx}(apache/hadoop)
• Invalid tuple literal for %s: component %d is not of type %s(apache/cassandra)
• there is no shared memory segment registered with shmId {}(apache/hadoop)

…and 660 more across the corpus — use search.

Honest provenance: generated on 2026-09-10 from AI-assisted analysis of the linked records. See how records are made.