Release 0.17.8

Release Notes

• update README.md (#2835)
• Fix bug in dry-run argument for update command (#2831)
• removing abstract requirement (#2830)
• [Documentation] Improve Java Streamlet API doc (#2819)
• add rate limit change log in stream manager (#2822)
• Fix URL issues associated with Hugo upgrade (#2825)
• More website fixes (#2824)
• Update Git submodule URL for GitHub pages branch (#2823)
• update baseURL for site generation (#2820)
• Add missing command line options for runtime config (#2818)
• Allow the apiserver to set the direct memory size. (#2813)
• Add a new tmaster endpoint for runtime config (#2747)
• [Streamlet Scala API] Add Scala Example Support - Part II (#2810)
• Refactor HttpUploader - Part II (#2812)
• Fix comment in heron_internals.yaml (#2811)
• fix library link in WORKSPACE (#2816)
• modified bazel build to include samoa (#2809)
• Nomad docker support (#2804)
• Revert "remove cpu rounding in packing algorithms (#2805)" (#2808)
• Add memory unit to k8s resource request. (#2802)
• remove cpu rounding in packing algorithms (#2805)
• Do not include scribe sink when compiling on non x86 platforms. (#2801)
• Add per component resource config for cpu and disk (#2800)
• Fix a typo and comments/doc for per component rate limit config (#2796)
• [Streamlet Scala API] Add Scala Example Support - Part I (#2791)
• [Streamlet Scala API] Add Scala StreamletImpl Support - Part V (#2790)
• Add rate limiter in stmgr (#2783)
• Correct print errors (#2789)
• Fix error message when large instance is packed (#2784)
• Add a new escaping '(61)' for '=' because the original one '='… (#2785)
• Add runtime config in heron update command (#2760)
• Fix tracker instance groups. (#2782)
• add a switch for metricscache (#2744)
• [healthmgr] add a class to expose metrics to local metricsmgr (#2771)
• [Streamlet Scala API] Add Scala StreamletImpl Support - Part IV (#2767)
• Add a topology config endpoint to the tracker. (#2781)
• Small change to Nomad doc (#2780)
• Retain heron-core package for YARN like schedulers (#2775)
• [Streamlet Scala API] Add Scala StreamletImpl Support - Part III (#2764)
• Builder creation (#2769)
• Fix heron update on k8s. (#2770)
• Improve Communicator tests (#2768)
• [Streamlet Scala API] Add Scala StreamletImpl Support - Part II (#2761)
• fixing bug in wakeable loop causing IndexOutOfBoundException (#2753)
• Fix heron-explorer components command. (#2762)
• Re-organize documentation nav (#2756)
• Add Scala StreamletImpl Support (#2740)
• [API] Improve HeronSubmitter (#2746)