fix: release pre-acquired stream IDs - #964
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Signed-off-by: Arnab Nandy <arnab_nandy7@yahoo.com>
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nikagra
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to nikagra/java-driver
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this pull request
Aug 3, 2026
Fills in the full DRIVER_CONFIG JSON report in the approved v2
cross-driver schema shape, replacing the stage-1 {"version":1}
placeholder. All groups are populated from Configuration and Policies
when the report is built, i.e. once per Cluster as it initializes.
Adds public getters to DCAwareRoundRobinPolicy and
RackAwareRoundRobinPolicy needed to report node-location-preference
and dc-failover, and makes PagingOptimizingLoadBalancingPolicy
implement ChainableLoadBalancingPolicy so the reporter can unwrap the
LB policy Cluster.Manager wraps at runtime.
Caps the report at 32KiB of UTF-8 (MAX_DRIVER_CONFIG_LENGTH), matching
the 4.x sibling PR scylladb#968, gocql scylladb#964 and csharp-driver scylladb#262. Beyond
cross-driver parity this is a correctness fix: CBUtil.writeString
writes each STARTUP value with a 16-bit length prefix and no bounds
check, so a value over 65535 bytes truncates the prefix modulo 65536
while still appending the whole body -- a corrupt frame and a failed
handshake, and not something the fail-safe try/catch can contain since
nothing throws. Parts of the report are user-supplied and unbounded
(DC/rack names, consistency levels, custom policy class names). Over
the limit means WARN and no DRIVER_CONFIG.
Hardens the other two ways reporting could break a connection rather
than merely fail to report:
- The fail-safe catch also covers InternalError, since customPolicy()
calls getClass().getSimpleName() on arbitrary user policy objects
(documented JDK edge case for certain synthetic classes). Not a bare
Error, so OutOfMemoryError/StackOverflowError still surface.
- The load balancing policy chain walk is bounded at 16 policies and
shared by both callers. It follows getChildPolicy() on arbitrary user
policies, so a cyclic chain used to spin forever on the Cluster
initialization path -- the one failure mode the try/catch cannot
contain, because it hangs rather than throws.
Adds a JSON-Schema conformance test suite (mirroring the 4.x sibling
PR scylladb#968): the normative schema is shipped as a test resource and
validated via com.networknt:json-schema-validator (pinned to 1.5.x,
the last line still targeting Java 8), covering every discriminated-
union branch and optional group the 3.x reporter can emit, plus a
negative test proving additionalProperties=false is enforced.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
nikagra
added a commit
to nikagra/java-driver
that referenced
this pull request
Aug 3, 2026
Fills in the full DRIVER_CONFIG JSON report in the approved v2
cross-driver schema shape, replacing the stage-1 {"version":1}
placeholder. All groups are populated from Configuration and Policies
when the report is built, i.e. once per Cluster as it initializes.
Adds public getters to DCAwareRoundRobinPolicy and
RackAwareRoundRobinPolicy needed to report node-location-preference
and dc-failover, and makes PagingOptimizingLoadBalancingPolicy
implement ChainableLoadBalancingPolicy so the reporter can unwrap the
LB policy Cluster.Manager wraps at runtime.
Caps the report at 32KiB of UTF-8 (MAX_DRIVER_CONFIG_LENGTH), matching
the 4.x sibling PR scylladb#968, gocql scylladb#964 and csharp-driver scylladb#262. Beyond
cross-driver parity this is a correctness fix: CBUtil.writeString
writes each STARTUP value with a 16-bit length prefix and no bounds
check, so a value over 65535 bytes truncates the prefix modulo 65536
while still appending the whole body -- a corrupt frame and a failed
handshake, and not something the fail-safe try/catch can contain since
nothing throws. Parts of the report are user-supplied and unbounded
(DC/rack names, consistency levels, custom policy class names). Over
the limit means WARN and no DRIVER_CONFIG.
Hardens the other two ways reporting could break a connection rather
than merely fail to report:
- The fail-safe catch also covers InternalError, since customPolicy()
calls getClass().getSimpleName() on arbitrary user policy objects
(documented JDK edge case for certain synthetic classes). Not a bare
Error, so OutOfMemoryError/StackOverflowError still surface.
- The load balancing policy chain walk is bounded at 16 policies and
shared by both callers. It follows getChildPolicy() on arbitrary user
policies, so a cyclic chain used to spin forever on the Cluster
initialization path -- the one failure mode the try/catch cannot
contain, because it hangs rather than throws.
A custom load balancing policy is now named after the policy the user
configured rather than PagingOptimizingLoadBalancingPolicy. Cluster
.Manager wraps every session's policy in that internal class, and it is
the outermost element of the chain, so every custom policy was reported
as {"type":"custom","name":"PagingOptimizingLoadBalancingPolicy"}.
Adds a JSON-Schema conformance test suite (mirroring the 4.x sibling
PR scylladb#968): the normative schema is shipped as a test resource and
validated via com.networknt:json-schema-validator (pinned to 1.5.x,
the last line still targeting Java 8), covering every discriminated-
union branch and optional group the 3.x reporter can emit, plus a
negative test proving additionalProperties=false is enforced.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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Description
What changed
DriverChannel.write()rejects a request before submitting it to the Netty pipeline.write()is called.Root cause
Channel selection calls
preAcquireId()before returning a channel. Request handlers then perform additional work before the resultingRequestMessagereachesInFlightHandler.If that work throws, or
DriverChannel.write()rejects the request before pipeline submission,InFlightHandlernever sees the request and therefore cannot release the reservation. Repeated failures can cause available stream-ID accounting to drift and eventually make healthy channels appear saturated.Impact
Every successful stream-ID pre-acquisition now ends in one of two outcomes:
InFlightHandler; orFixes #947.
Validation
git diff --checkpassed