Breaking API Changes

• finagle-thrift: Change the partition locator function getLogicalPartitionId in
  PartitioningStrategy from Int => Int to Int => Seq[Int], which supports many to many mapping
  from hosts and logical partitions. ab641adc

Runtime Behavior Changes

• finagle-core: Disable eager connections for balancers with a non 1.0 weight. 11eae0d6

New Features

• finagle-core: Add RelativeName field to Metric Metadata and populate it for
  client and server metrics. de589ffa
• finagle-scribe: Add c.t.finagle.scribe.Publisher for publishing messages to a
  Scribe process. 7723a949

Runtime Behavior Changes

• finagle: Bump version of Jackson to 2.11.2. 6c6c882a

Bug Fixes

• finagle-core: The TraceId alternative constructor now forwards the traceIdHigh parameter to
  the primary constructor. 567e8d66

20.8.1

New Features

• finagle-thriftmux: Add MethodBuilder specific APIs for ThriftMux partition aware client.
  e2f467c1

20.8.0

Runtime Behavior Changes

• finagle-netty4-http: Post, Put, Patch non-streaming outbound requests with empty bodies will
  be added the Content-Length header with value 0. 9ce18e85
• finagle-core: A ServiceFactory created by ServiceFactory.const/constant propagates the wrapped
  service status. 3347c095
• finagle-http: c.t.f.http.filter.PayloadSizeFilter no longer adds an annotation on each
  streaming chunk and instead aggregates the byte count and adds a single record on stream
  termination. e87b1c35
• finagle-zipkin-scribe: zipkin scribe log_span prefix replaced with scribe. zipkin-scribe/scribe/<stats>. 5b100ee9

New Features

• finagle-core: introduce type-safe ReqRep variant 459daf68
• finagle-core: Added a new variant of Filter.andThenIf which allows passing the parameters
  as individual parameters instead of a Scala tuple. fb071d9b
• finagle-core: new metric (counter) for traces that are sampled. finagle/tracing/sampled 1d6503e0
• finagle-netty4: Add the c.t.f.netty4.Netty4Listener.MaxConnections param that can be used
  to limit the number of connections that a listener will maintain. Connections that exceed
  the limit are eagerly closed. 9991aae3
• finagle-thrift: Added java-friendly c.t.f.thrift.exp.partitioning.ClientHashingStrategy and
  c.t.f.thrift.exp.partitioning.ClientCustomStrategy create methods, and added java-friendly
  c.t.f.thrift.exp.partitioning.RequestMergerRegistry#addRequestMerger and
  c.t.f.thrift.exp.partitioning.ResponseMergerRegistry#addResponseMerger to make partitioning
  easier to use from Java. e0d78d14

Breaking API Changes

• finagle-core: ReqRep can no longer be created via new ReqRep(..). Please use
  ReqRep.apply(..) instead.
  459daf68
• finagle-thrift: Updated the c.t.f.thrift.exp.partitioning.ClientHashingStrategy and the
  c.t.f.thrift.exp.partitioning.ClientCustomStrategy to take constructor arguments instead
  of needing to override methods on construction. e0d78d14
• finagle-zipkin-core: Removed unused statsReceiver constructor argument from RawZipkinTracer. 5b100ee9

20.7.0

Breaking API Changes

• finagle-core: Correct the spelling of Tracing.recordClientSendFrargmet() to
  Tracing.recordClientSendFragment() 30726c01
• finagle-redis: Use StrictKeyCommand for XDEL d174f9d6
• finagle-toggle: Toggle.isDefinedAt(i: Int) has become Toggle.isDefined. Additionally, a new method Toggle.isUndefined has been added. 3bb78ce8
• finagle-zipkin-scribe: The scribe.thrift file was moved to finagle-thrift/src/main/thrift under a new
  namespace. com.twitter.finagle.thrift.scribe.(thrift|thriftscala) 01a20b79

Bug Fixes

• finagle-zipkin-scribe: The scribe client should be configured using the NullTracer. Otherwise, spans
  produced by the client stack will be sampled at initialSampleRate. 0446dd3e

Runtime Behavior Changes

• finagle-core: FailFastFactory is now disabled at runtime when a client's destination has only
  one endpoint, since the client cannot do anything meaningful by breaking the circuit early.
  This is recommended as a best practice anyway, now it's the default behavior. Less things
  to configure and worry about! f2c100e8
• finagle-core: namer annotations are prefixed with "clnt/". c8680fff
• finagle-core: namer.success & namer.failure are not annotated as they are not request based.
  namer.tree annotation was also removed to reduce the size of traces. c8680fff
• finagle-core: The offload filter client annotation is annotated under the child request span instead of
  its parent. The offload filter annotations are also changed to be binary annotations with the key
  (clnt|srv)/finagle.offload_pool_size and the value being the pool size 011f096d
• finagle-memcached: The key in RetrievalCommand are ommited in traces. The total number of Hits
  and Misses are annotated via a counter instead under clnt/memcached.(hits/misses) 6fd0e2c9

Breaking API Changes

• finagle-core: Migrated List[Tracer] to Seq[Tracer] in Tracing, and tracersCtx.
  cb06890b
• finagle-core: PayloadSizeFilter and WireTracingFilter are now public APIs.
  fc1951a5
• finagle-zipkin-core: initialSampleRate flag will now fail if the sample rate is not in the range
  [0.0, 1.0]. 180f333c
• finagle-mysql: mysql client annos are prefixed with clnt/ 37d55c2a

New Features

• finagle-thrift: Expose c.t.f.thrift.exp.partitioning.PartitioningStrategy,
  the bundled PartitioningStrategy APIs are public for experiments.
  bf1d47be
• finagle-http: Add LoadBalancedHostFilter to allow setting host header after LoadBalancer
  5304ce69
• finagle-core: Trace the request's protocol identified by the ProtocolLibrary of the client
  stack. This is annotated under clnt/finagle.protocol. 464bbeb6
• finagle-core: Add letTracers to allow setting multiple tracers onto the tracer stack.
  cb06890b
• finagle-core: DeadlineFilter now exposes a metric admission_control/deadline/remaining_ms
  which tracks the remaining time in non-expired deadlines on the server side. An increase in this
  stat, assuming request latency is constant and timeout configurations upstream have not changed,
  may indicate that upstream services have become slower. 939f9a3e
• finagle-redis: Make partitionedClient accessible. 7ba107e1
• finagle-core, finagle-http, finagle-thriftmux: introduce MethodBuilder maxRetries
  configuration. A ThriftMux or HTTP method can now be configured to allow a specific number of
  maximum retries per request, where the retries are gated by the configured RetryBudget. This
  configuration can be applied via Http.client.methodBuilder(name).withMaxRetries(n) or
  ThriftMux.client.methodBuilder(name).withMaxRetries(n). 4328896d
• finagle-memcached: Annotate the shard id of the backend the request will reach. 6fd0e2c9

Bug Fixes

• finagle-zipkin-core: Remove flush and late-arrival annotations, which artificially extend
  trace durations. 967ef1fc
• finagle-core: namer annotations are added at the Service level instead of ServiceFactory as
  traces are intended to be request based c8680fff

Runtime Behavior Changes

• finagle: Bump jackson version to 2.11.0. 696bb515

New Features

• finagle-redis: Add ConnectionInitCommand stack to set database and password.
  9fe05301

• finagle-mysql: Add ConnectionInitSql stack to set connection init sql. bd4411dd

Runtime Behavior Changes

• finagle-core: Requeued reqeuests due to the c.t.finagle.service.RequeueFilter will generate
  their own spanId. af490773

Bug Fixes

• finagle-core: Restrict OffloadFilter from allowing interruption of the work performed in the worker pool. This is to ensure that the worker thread isn't interruptible, which is a
  behavior of certain FuturePool implementations. f0af6ad7 59f9f2b5

• finagle-netty4: ChannelStatsHandler will now only count the first channel close(..) call when incrementing the closes counter. 3fa91944

Breaking API Changes

• finagle-toggle: Removed abstract type for c.t.finagle.Toggle, all Toggles are of type Int.
  This is to avoid Integer auto-boxing when calling Toggle.apply, thus to improve overall toggle performance. c81a87b0

• finagle-core: Retried requests due to the c.t.finagle.service.RetryFilter will generate their
  own spanId. 762471a0

New Features

• finagle-thrift/thriftmux: Thrift and ThriftMux client side can set a sharable
  TReusableBuffer by withTReusableBufferFactory. 9213ca35

Breaking API Changes

• finagle-partitioning: Rename c.t.finagle.partitioning.CacheNode and CacheNodeMetadata
  to c.t.finagle.partitioning.PartitionNode and PartitionNodeMetadata. d32f0c25

• finagle-partitioning: Rename c.t.finagle.partitioning.KetamaClientKey to HashNodeKey
  2d0cd33e

Bug Fixes

• finagle-base-http: RequestBuilder headers use SortedMap to equalize keys in different caps.
  setHeader keys are case insensitive, the last one wins. 535f324c

New Features

• finagle-opencensus-tracing: Add support for providing a custom TextFormat for header
  propagation. a02d377a

Runtime Behavior Changes

• finagle-netty4: When not using the JDK implementation, the Netty reference counted SSL
  types are used which move SSL cleanup out of the GC cycle, reducing pause durations.
  466aa5bf

• finagle-base-http: Support for the SameSite cookie attribute is now on by default. This can
  be manipulated via the com.twitter.finagle.http.cookie.supportSameSiteCodec flag. This means
  that cookies that have a value other than Unset for the sameSite field will have the
  attribute encoded (by servers) and decoded (by clients). See this
  Chromium blog post
  for more information about the SameSite attribute. f96c3729

• finagle-core: The default NullTracer for ClientBuilder has been removed. Affected clients may
  now see tracing enabled by default via the Java ServiceLoader, as described in the
  Finagle User's Guide. 6b3f0940

• finagle-http2: The HTTP/2 frame logging tools now log at level INFO. This is symmetric with
  the behavior of the ChannelSnooper tooling which serves a similar purpose which is to aid
  in debugging data flow and isn't intended to be enabled in production. 78e4596b

Bug Fixes

• finagle-zipkin-scribe: add a logical retry mechanism to scribe's TRY_LATER response 23ff595b

• finagle-http2: Initialize state in H2Pool before use in the gauge to avoid a
  NullPointerException. 289de8a3

• finagle-http2: HTTP/2 server pipeline now traps close calls to ensure that
  events from the initial HTTP/1.x pipeline don't close the HTTP/2 session. For
  example, the initial pipeline was subject to session timeouts even though the
  tail of the socket pipeline was effectively dead. Closing of HTTP/2 server
  pipelines is now handled through the H2ServerFilter. 670dbf74

• finagle-http2: HTTP/2 servers clean out unused channel handlers when upgrading
  from a HTTP/1.x pipeline, removing some traps such as unintended timeouts.
  3dfe8226

• finagle-opencensus-tracing: Fixed internal server error when invalid or no propagation headers
  are provided. a02d377a

• finagle-zipkin-scribe: export application metrics under a consistent zipkin-scribe scope. Finagle client
  stats under clnt/zipkin-scribe a17659dd

Breaking API Changes

• finagle-zipkin-scribe: update the deprecated FutureIface to MethodPerEndpoint 23ff595b

• finagle-zipkin-scribe: Coalesce ScribeRawZipkinTracer apply methods into two simple ones. a17659dd

• finagle-zipkin-scribe: DefaultSampler moved to c.t.f.zipkin.core in finagle-zipkin-core. ac9c7ec1

• finagle-zipkin-scribe: initialSampleRate GlobalFlag is moved to finagle-zipkin-core, under the same package
  scope c.t.f.zipkin. ac9c7ec1

New Features

• finagle-memcached: Upgrade to Bijection 0.9.7. de0ec2c6
• finagle-opencensus-tracing: Enables cross-build for 2.13.0. fee83b10
• finagle-thriftmux: Add support for automatically negotiating compression between a client
  and server. Off by default, clients and servers must be configured to negotiate.
  d42c87a9
• finagle-stats: Enables cross-build for 2.13.0. 4144d73c
• finagle-stats-core: Enables cross-build for 2.13.0. 4144d73c
• finagle-serversets: Add generic metadata support in ServerSet. Add support for announcing the
  generic metadata via ZkAnnouncer. Add support to resolve the generic metadata via Zk2Resolver
  180bb925

Breaking API Changes

• finagle-partitioning: ZKMetadata case class has a new default argument breaking API for
  Java users. 180bb925
• finagle-serversets: Endpoint case class has a new metadata argument. 180bb925

New Features

• finagle-core, finagle-exp: Add annotations to DarkTrafficFilter to identify which span
  is dark, as well as which light span it correlates with. ba351f4d
• finagle-core: Introduce Trace#traceLocal for creating local spans within a trace context.
  1c6d5d24

Runtime Behavior Changes

• finagle: Upgrade to jackson 2.9.10 and jackson-databind 2.9.10.1 e333c839
• finagle-core: Per-method metrics on MethodBuilder are now created lazily, so if you have
  methods that you don't use, the associated metrics won't be exported. 6be5dc48
• finagle-mysql: The RollbackFactory no longer attempts to roll back if the underlying
  session is closed since it is highly unlikely to succeed. It now simply poisons the
  session and calls close. 99135e00
• finagle-netty4: Change the 'connection_requests' metric to debug verbosity.
  a6dc1296
• finagle-serversets: Ensure ZkSession#retrying is resilient to ZK host resolution failure.
  7125026a
• finagle-thrift: Per-method metrics are now created lazily, so if you have methods on a Thrift
  service that you don't use, the associated metrics won't be exported. 6be5dc48
• finagle-zipkin-core: Tracing produces microsecond resolution timestamps in JDK9 or later.
  08a926c6
• finagle-core: Trace#time and Trace#timeFuture no longer generate timestamped annotations or
  silently discard timing information. They now instead generate a BinaryAnnotation containing
  the timing information. In order to also get timestamped Annotations for when the operation
  began and ended, use in conjunction with Trace#traceLocal. 1c6d5d24

Breaking API Changes

• finagle-core: The RetryPolicy companion object is no longer a JavaSingleton.
  9ffb3d13
• finagle-thrift: The RichClientParam constructors are now all either
  deprecated, so to construct it, you must call one of the RichClientParam.apply
  methods. 6be5dc48

Deprecations

• finagle-core: Deprecate Tracing#record(message, duration) as it does not have the intended
  effect and silently discards any duration information in the resulting trace. Instead you should
  use either Tracing#recordBinary or a combination of Trace#traceLocal and Trace#time.
  1c6d5d24

Bug Fixes

• finagle-core: ClosableService client stack module that prevents the reuse of closed services
  when FactoryToService is not set. This is important for clients making use of the newClient
  api. c64bea09

New Features

• finagle-base-http: The Uri class now provides access publicly to its
  path, which is the request uri without the query parameters.
  f40fe447
• finagle-mysql: Adding native support to finagle-mysql for MySQL JSON Data Type. A client
  can now use jsonAsObjectOrNull[T] or getJsonAsObject[T] APIs on c.t.f.mysql.Row to
  read the underlying json value as type T or use jsonBytesOrNull API to get a raw byte
  array of the the json column value. 4d403051
• MySQL integration tests can now run on a port other than the default (3306). Add a port
  property to .finagle-mysql/integration-test.properties to customize the value.
  4d403051

Runtime Behavior Changes

• finagle: Upgrade to Netty 4.1.43.Final and netty-tcnative 2.0.26.Final. cfaaa471
• finagle: Add initial support for JDK 11 compatibility. 04def84b
• finagle: Upgrade to caffeine 2.8.0 c335b29e
• finagle-http2: Nacks in the form of RST(STREAM_REFUSED | ENHANCE_YOUR_CALM) no
  longer surface as a RstException, instead opting for a generic Failure to be
  symmetric with the HTTP/1.x nack behavior. cb67fa33
• finagle-mux: The mux handshake latency stat has be changed to Debug
  verbosity. 0eb2cfb6
• finagle-serversets: finagle/serverset2/stabilizer/notify_ms histogram has been downgraded to
  debug verbosity. 30d3d0ea

Breaking API Changes

• finagle-base-http: c.t.f.http.codec.HttpContext moved into c.t.f.http.codec.context.HttpContext
  cc29b265

New Features

• finagle-partition: Enables cross-build for 2.13.0. 89f06885
• finagle-exception: Enables cross-build for 2.13.0. d90ae646
• finagle-exp: Enables cross-build for 2.13.0. 32bc9f48
• finagle-mysql: Enables cross-build for 2.13.0. ef31c99b
• finagle-{mux,thrift,thrift-mux}: Enables cross-build for 2.13.0. 47ee31fd
• finagle-redis: Enables cross-build for 2.13.0. d90ae646
• finagle-tunable: Enables cross-build for 2.13.0. 69ded534
• finagle-grpc-context: Enables cross-build for 2.13.0. 65963f58
• finagle-thrift: Pass a factory to create a TReusableBuffer as the parameter of a finagle client
  to allow multiple clients share one TReusableBuffer. 05b2ec71

Runtime Behavior Changes

• finagle-base-http: Better performance for the default HeaderMap.add method for headers with
  the same name. 1fab9386
• finagle-http2: H2ServerFilter will no longer swallow exceptions that fire via
  exceptionCaught in the Netty pipeline. 12621ff8
• finagle-http: Remove legacy HTTP/2 client implementation and make the MultiplexHandler-based
  implementation the default HTTP/2. b6d0aa19

Breaking API Changes

• finagle-core: c.t.f.l.FailureAccrualFactory's didMarkDead() changed to didMarkDead(Duration).
  The Duration is the length of time the endpoint is marked dead. fe2f43a3

Bug Fixes

• finagle-mux: Mux now properly propagates Ignorable failures multiple levels for superseded
  backup requests. This allows for more accurate success rate metrics for downstream services,
  when using backup requests.
  21b181e8

New Features

• finagle-{core,init,toggle,netty4}: Enables cross-build for 2.13.0. f21a54e0
• finagle-base-http: Add None as a valid SameSite header value. 0c43561a

Breaking API Changes

• finagle-core: The constructor on c.t.f.filter.NackAdmissionFilter used for testing that
  took an Ema.Monotime has been removed. 38fae802
• finagle-core: The Adddress.ServiceFactory variant has been promoted from experimental
  status and moved to be properly part of c.t.f.Address. 68cf34b8
• finagle-http: improve performance of c.t.f.http.filter.StatsFilter. This results in two notable
  API changes: 1. There is a private[filter] constructor which can take a () => Long for
  determining the current time in milliseconds (the existing StatsFilter(StatsReceiver)
  constructor defaults to using Stopwatch.systemMillis for determining the current time in
  milliseconds. 2. The protected count(Duration, Response) method has been changed to
  private[this] count(Long, Response) and is no longer part of the public API.
  f6ce4529
• finagle-partitioning: the hash-based routing that memcached uses has been relocated to a new
  top-level module so that it can be used more broadly across protocols. This results
  in several classes moving to the c.t.f.partitioning package: 1. The Memcached.param.EjectFailedHost, KeyHasher, and NumReps parameters are now
  available under c.t.f.partitioning.param 2. The FailureAccrualException and CacheNode definitions are now in the c.t.f.paritioning
  package. 3. The ZkMetadata class has moved to c.t.f.p.zk and the finagle-serverset module now depends
  on finagle-partitioning.
  f27073dc

Runtime Behavior Changes

• finagle-http: c.t.f.http.service.NotFoundService has been changed to no longer
  use Request.response. Use of Request.response is deprecated and discouraged.
  acac9c38
• finagle-mysql: Handshaking for the MySQL 'Connection Phase' now occurs as part of session
  acquisition. As part of this change, the
  com.twitter.finagle.mysql.IncludeHandshakeInServiceAcquisition toggle
  has been removed and it no longer applies. cd4877c1
• finagle: Upgrade to Netty 4.1.39.Final. 001b0940
• finagle-http: Enable Ping Failure Detection for MultiplexHandler based HTTP/2 clients. Note that
  the Ping Failure Detection implementation has been removed completely from the
  non-MultiplexHandler based HTTP/2 client. 8af32742
• finagle: Added a dependency on Scala Collections Compat 2.1.2. f21a54e0

Bug Fixes

• finagle-base-http: Removes the Cookie header of a c.t.f.http.Message whenever its cookie map
  becomes empty. f9b76a0f

Breaking API Changes

• finagle-core: The contents of the c.t.f.dispatch.GenSerialClientDispatcher object have been
  moved to the new c.t.f.dispatch.ClientDispatcher object. The stats receiver free constructors
  of GenSerialClientDispatcher and SerialClientDispatcher have been removed.
  4b0493c6
• finagle-thrift: The deprecated ReqRepThriftServiceBuilder object has been
  removed. Users should migrate to ReqRepMethodPerEndpointBuilder. f1c4d589

Runtime Behavior Changes

• finagle-core: Failed reads on Linux due to a remote peer disconnecting should now be properly
  seen as c.t.f.ChannelClosedException instead of a c.t.f.UnknownChannelException.
  b06fab3e
• finagle: Upgrade to Jackson 2.9.9. 464ae751
• finagle: Upgrade to Netty 4.1.38.Final. 23532f19

New Features

• finagle-http: Measure streaming (message.isChunked) chunk payload size with two new histograms:
  stream/request/chunk_payload_bytes and stream/response/chunk_payload_bytes, they are
  published with a debug verbosity level. These chunk payload sizes are also traced via the same
  trace keys. 11f4e32cd8e5fcab9fc0de998f3e844f37ab741c

• finagle-base-http: Add support for new "b3" tracing header. 87218372d0ae81d93c551a0752aec57b3fdaf60d

• finagle-core: Allow to not bypass SOCKS proxy for localhost by using the GlobalFlag
  -com.twitter.finagle.socks.socksProxyForLocalhost 5521bc830f792862bb2aa06847f3f8493c673412

• finagle-core: OffloadFilter flag to reduce network contention. 2bd4d61b896d261b3928ce5b6858e7d250e2be39

• finagle-exp: Add private c.t.f.exp.ConcurrencyLimitFilter for rejecting requests
  that exceed estimated concurrency limit e331491cb7c9013ac0292e1d39b6fd9f16374b99

Runtime Behavior Changes

• finagle-http: c.t.f.http.Cors has been changed to no longer use the c.t.f.http.Response
  associated with the passed in c.t.f.http.Request. 455718a5bec275452d904d09351d10ab0727973a

• finagle-http: c.t.f.http.filter.ExceptionFilter has been changed to no longer
  use the c.t.f.http.Response associated with the passed in. 54d4acf1918fba9d1711f3591f667fd62fc4e2da

• finagle-http: Optimize creation of new Http Dispatchers by re-using created metrics and loggers.
  9156f0f82c31b0df689a851712cefcce490aa50f

Breaking API Changes

• finagle-base-http: Removed the methods setStatusCode and getStatusCode from
  c.t.f.http.Response which have been deprecated since 2017. 20b37b0be21b345622ebe48ad1b16fabd58b7f03

• finagle-core: All deprecated c.t.f.builder.ServerBuilder#build methods have
  been removed. Users should migrate to using the build method which takes a
  ServiceFactory[Req, Rep] as a parameter. 7ae208df0499b89bc3e632502a36463303172074

• finagle-core: The c.t.f.ssl.client.SslClientEngineFactory#getHostname method has been removed.
  All uses should be changed to use the getHostString method of SslClientEngineFactory instead.

• finagle-http: The setOriginAndCredentials, setMaxAge, setMethod, and setHeaders methods
  of c.t.f.http.Cors.HttpFilter are no longer overridable. 455718a5bec275452d904d09351d10ab0727973a

• finagle-http: The details of the c.t.f.Http.HttpImpl class are meant to be implementation
  details so the class constructor was made private along with the fields. Along these same lines
  the c.t.f.Http.H2ClientImpl.transporter method has been moved to a private location.
  1338e508dff6517a1801454cdcad95c1a4b94779

Bug Fixes

• finagle-core: Ensure ClientDispatcher queueSize gauge is removed on transport
  close, instead of waiting for clean-up at GC time. 963e9b84153584184fc47c03c32b5cd5feda8bdc

• finagle-http2: Don't propagate stream dependency information for the H2 client.
  a2e6c0ba5a1e9381fe7306ae128acca92df16021

New Features

• finagle-core: SSL/TLS session information has been added to c.t.f.ClientConnection.
  69a28c10
• finagle-core: Add a Stack Module with 7 parameters for convenience sake. 6f9d7f0d
• finagle-core: For both, servers and clients, introduce a way to shift application-level future
  callbacks off of IO threads, into a given FuturePool or ExecutorService.
  Use withExecutionOffloaded configuration method (on a client or a server) to access
  new functionality. 40431bb4
• finagle-http: Added counters for request/response stream as: stream/request/closed,
  stream/request/failures, stream/request/failures/<exception_name>, stream/request/opened,
  stream/request/pending and stream/response/closed, stream/response/failures,
  stream/response/failures/<exception_name>, stream/response/opened, stream/response/pending.
  The counters will be populated when isChunked is set to true, the failures counters will be
  populated when isChunked is set to true and the stream fails before it has been fully read in the
  request and response respectively. d9b69bdc
• finagle-http: Add two new API variants in CookieMap: addAll and removeAll that allow for
  adding and removing cookies in bulk, without triggering a header rewrite on each item.
  4127cf6d
• finagle-mysql: finagle-mysql now supports using SSL/TLS with MySQL. SSL/TLS can be turned on by
  calling withTransport.tls(sslClientConfiguration) with a specified
  c.t.f.ssl.client.SslClientConfiguration. 0b6c20ac

Runtime Behavior Changes

• finagle: Upgrade to Netty 4.1.35.Final and netty-tcnative 2.0.25.Final.
  9ffbf7a7
• finagle-core: The default failure accrual policy has been changed from one
  which uses only consecutive failures to a hybrid model which uses both
  success rate over a window and consecutive failures. Previously this was
  changeable via toggle. The toggle has been removed, and the hybrid version
  has been made the default. 6f85c56e
• finagle-http: Rename request_stream_duration_ms to stream/request/duration_ms and
  response_stream_duration_ms to stream/response/duration_ms. The stats will be
  populated when isChunked is set to true in the request and response respectively.
  d9b69bdc
• finagle-http2: Disable ping-based failure detector in HTTP/2 client as it seems to do
  more harm than good. ea5b0c77
• finagle-http2: Frame logging is now disabled by default for clients. To enable,
  use the c.t.f.http2.param.FrameLogging.Enabled Stack Param. For example:
  Http.client.configured(FrameLogging.Enabled). 0b2ec201
• finagle-netty4: When using a Netty LocalChannel, the value of the BackPressure
  stack param is effectively changed to backPressureDisabled so that other functionality
  (e.g. SSL/TLS) works as expected. 3a8e5c19
• finagle-netty4: finagle/netty/pooling/used now includes the size of the buffers in the
  thread-local caches. 824596f0
• finagle-core: Stats and retry modules use a ResponseClassifier to give hints
  for how to handle failure (e.g., Is this a success or is it a failure? If
  it's a failure, may I retry the request?). The stats module increments a
  success counter for successes, and increments a failure counter for failures.
  But there isn't a way to tell the stats module to just do nothing. And, this
  is exactly what the stats module should do (nothing) in the case of ignorable
  failures (e.g. backup request cancellations). To represent these cases, we
  introduce a new ResponseClass: Ignorable. 256b79b8

Bug Fixes

• finagle-core: UsingSslSessionInfo would fail to be constructed properly when
  SSLSession.getLocalCertificates returns 'null'. 8d984963
• finagle-http: Finagle now properly sets the Transport.peerCertificate local context
  when using HTTP/2. a661fef4
• finagle-http: c.t.f.http.collection.RecordSchema.Record is now thread-safe.
  4e343f0e
• finagle-zipkin-core: Fix a race condition which could cause a span to get logged
  missing some annotations. 53901a28
• finagle-mysql: Don't log c.t.f.ChannelClosedException when rolling back a transaction
  fails. 29cfffe6

Breaking API Changes

• finagle-core: The exceptions c.t.f.SslHandshakeException and
  c.t.f.SslHostVerificationException were no longer used and have
  been removed. 2a53531d
• finagle-mysql: The structure of c.t.f.mysql.Request has changed. It is now based on
  a higher level c.t.f.mysql.ProtocolMessage and the cmd field must contain a value.
  Additionally, the synthetic Command.COM_NO_OP has been removed, as due to the
  restructuring it was no longer necessary. d6e4042f
• finagle-mysql: Uses of the abbreivation 'cap' have been renamed to the full
  word: 'capabilities', including for the baseCapabilities of Capability.
  4c57afda

Deprecations

• finagle-http: Removed deprecated response_size in Finagle Http stats. This is a duplicate stat
  of response_payload_bytes. 1286c438

No Changes

New Features

• finagle-http: Add two new methods to com.twitter.finagle.http.MediaType,
  MediaType#typeEquals for checking if two media types have the same type and
  subtype, ignoring their charset, and MediaType#addUtf8Charset for easily
  setting a utf-8 charset. ec0953f1

Bug Fixes

• finagle-http: Ensure server returns 400 Bad Request when
  non-ASCII characters are present in the HTTP request URI path. a7dae7ea

Runtime Behavior Changes

• finagle-core: Deterministic aperture (d-aperture) load balancers no longer export
  "loadband" scoped metrics: "widen", "narrow", "offered_load_ema". These were not
  necessary as d-aperture does not change the aperture size at runtime. 20029ac5
• finagle-core: Request logging now defaults to disabled. Enable it by configuring the
  RequestLogger Stack parameter on your Client or Server. ee9cb4ec
• finagle-core: Subtree binding failures in NameTree.Union's are ignored in the
  final binding result. 2fde4d2d

Breaking API Changes

• finagle-core: The c.t.f.client.EndpointerModule and c.t.f.pushsession.PushStackClient public
  and protected APIs have been changed to use the abstract java.net.SocketAddress instead of the
  concrete java.net.InetSocketAddress as relying on the concrete implementation was not
  necessary. 77a3cdfd
• finagle-http: For Finagle HTTP clients, the withMaxRequestSize(size) API
  method has been removed. For Finagle HTTP servers, the
  withMaxResponseSize(size) method has been removed. The underlying Stack
  params which are set by these methods are respectively HTTP server and HTTP
  client side params only. Using these removed methods had no effect on the
  setup of Finagle HTTP clients and servers. 5eb3ae24
• finagle-mysql: HandshakeResponse has been removed from finagle-mysql's public
  API. It is expected that users of the library are relying entirely on
  finagle-mysql for handshaking. f0ab09a6