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JDK.md

JDK and Hadoop

  • 2 level of support
    • Runtime-level support
    • Source-level support

Current status

Runtime Support

  • Binaries compilied with JDK 6 or JDK 7 work well
  • Report from discussion on mailing list
  • CDH 5: Runtime support(1.8.0_40 or upper is recommended for Kerberos auth)
  • Running HBase on JDK 1.8.0u60 in production
  • sun.security.krb5.KrbApReq http://hg.openjdk.java.net/jdk8u/jdk8u60/jdk/rev/02d6b1096e89
    • fixed on 1.8.0u60
  • Runtime is OK

Problems

  • Source-level support
    • new bytecode are added -> need to update reflection libraries(asm, cglib, guice)
    • Jersey is last one mile
    • Upgrading to Java 8 at scale
    • it's drastic incompatibility - will be merged into 3.0.0

issues

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