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CHANGELOG.md

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Change Log

Version 0.13.0 - 03/09/2023

Major new features

  • Introduced parallel instrumentation preprocessing to lower time spent preprocessing
  • Introduced instrumentation preprocessing artifact caching to enable configurable artifact caching strategies to prevent redundant preprocessing
  • Added support for JDK-17 by enabling building patched copy of ByteBuddy dependency

Minor new features

  • Deprecated HeaderRetrievable in favor of Activity/Downstream x Request/Response events and added corresponding Apache HttpClient downstream Request/Response header events
  • Implemented Killswitch file mechanism
  • Added additional logging to indicate when Signed Jars are preprocessed
  • Extended ServiceEvent API to support Event IDs
  • Implemented AgentConfig override via properties file

Bug fixes

  • Fixed mvn mysql-connector-java coordinates
  • Fixed (Scheduled)ThreadPoolExecutor task removal
  • Removed thread id comparison on thread enter to allow TX propagation during async workflows

Version 0.12.0 - 04/25/2022

Major new features

  • Introduced instrumentation preprocess feature under disco-java-agent-instrumentation-preprocess. Instrumentation preprocess addresses issues caused by runtime instrumentation overhead such as longer startup time by instrumenting the JDK and all the dependencies at build-time instead.
  • Added PluginClassLoader. This is the new default class loader for loading Disco plugins.
  • Added a new plugin to support transaction context (TX) propagation for Kotlin coroutines.

Minor new features

  • Implemented TrieNameMatcher to match class name using Trie data structure.
  • Generated transaction ID using ThreadLocalRandom. The implementation is adapted from X-Ray SDK FastIdGenerator.
  • Provided timing metric to measure how long it take for Disco agent to start.
  • Disposed of Thread, ForkJoinPool, and ForkJoinTask interceptors after they are applied once. This is an optimization to bypass class matching for these named classes.

Bug fixes

  • Added check to prevent Disco agent to be loaded more than once.
  • Cleaned up ThreadLocal transaction context when the thread ends or is pushed back into the pool.
  • Fixed NPE when Thread is instantiated without a target.
  • Fixed ClassCircularityError when running with security manager. This is a known problem with ByteBuddy, since the OpenTelemetry also encountered it.
  • Handled exceptions in Disco EventBus when listening to incoming events.
  • Upgraded to the latest net.bytebuddy:byte-buddy-dep-1.12.6 and org.ow2.asm:asm-9.2.

Version 0.11.0 - 04/07/2021

  • Added additional SQL interception support for prepared statements and calls PR #16

Version 0.10.0 - 08/25/2020

  • Added SQL interception package PR #10
  • Added AWS interception package PR #10
  • Added instrumentation preprocess package PR #10
  • Added Bill of Materials PR #10
  • Added installable Package class for collections of installables PR #10
  • Added concurrency support for ScheduledThreadPoolExecutor PR #10
  • Added Service downstream cancellation events PR #10
  • Added HeaderReplaceable interface for event classes PR #10
  • Added removeMetadata method for Transaction Context PR #10
  • Added support in core package for preprocess build tool PR #10
  • Fixed deprecated reflective access in ForkJoinTask tests PR #10
  • Fixed null pointer issues in HttpResponseEvent and TransactionContext PR #10
  • Fixed ExecutorService to use re-entrancy check PR #10
  • Fixed flaky TX tests PR #10
  • Ensure transaction context is propagated for nested executor submissions PR #10
  • Deprecated MethodHandleWrapper class PR #10
  • Upgraded ByteBuddy to 1.10.14 and ASM to 8.0.1 PR #10
  • Upgraded to Gradle 6.6 PR #10

Version 0.9.1 - 12/2/2019

  • Initial commit of DiSCo Toolkit