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consistent-hashing's Introduction

Hey, I am Dominik 🧑‍💻

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I live in Germany 🏫, started working as a Full Stack Developer in 2003 👴 and I am currently working as a Senior Data Engineer at YAZIO👨‍💻.

  • 🔭 I’m currently working on grooveguessr
  • 💻 mainly working with Kotlin, Spring Boot and Python in my day job now
  • 🦀 love Rust
  • I have a keen interest in aviation 🛫, football 🏈, and 3D printing

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consistent-hashing's Issues

Blows Java heap depending on how you init your ring (with a substantial amount of points)

I've been using this lib with jruby (1.7.2 (1.9.3p327) 2013-01-04 302c706 on OpenJDK 64-Bit Server VM 1.7.0_25-b30 [linux-amd64]) for over a year in a project of mine and it's been a workhorse.

I recently needed to use it in a different context where I have a lot more points on my ring and the following code blows the java heap on my development laptop:

irb(main):032:0* require 'consistent_hashing'
=> false
irb(main):033:0> ring = ConsistentHashing::Ring.new; (1..1024).map {|i| ring << i}
Java::JavaLang::OutOfMemoryError: Java heap space
    from org.jruby.util.ByteList.ensure(ByteList.java:341)
    from org.jruby.RubyString.modify(RubyString.java:923)
    from org.jruby.RubyString.cat(RubyString.java:1359)
    from org.jruby.RubyString.cat19(RubyString.java:1324)
    from org.jruby.RubyString.cat19(RubyString.java:1317)
    from org.jruby.RubyArray.inspectAry(RubyArray.java:1486)
    from org.jruby.RubyArray.inspect(RubyArray.java:1510)
    from org.jruby.RubyArray$INVOKER$i$0$0$inspect.call(RubyArray$INVOKER$i$0$0$inspect.gen)
    from org.jruby.runtime.callsite.CachingCallSite.cacheAndCall(CachingCallSite.java:306)
    from org.jruby.runtime.callsite.CachingCallSite.call(CachingCallSite.java:136)
    from org.jruby.ast.CallNoArgNode.interpret(CallNoArgNode.java:64)
    from org.jruby.ast.NewlineNode.interpret(NewlineNode.java:105)
    from org.jruby.ast.RescueNode.executeBody(RescueNode.java:224)
    from org.jruby.ast.RescueNode.interpret(RescueNode.java:119)
    from org.jruby.ast.BeginNode.interpret(BeginNode.java:83)
    from org.jruby.ast.NewlineNode.interpret(NewlineNode.java:105)
    from org.jruby.evaluator.ASTInterpreter.INTERPRET_BLOCK(ASTInterpreter.java:112)
    from org.jruby.runtime.Interpreted19Block.evalBlockBody(Interpreted19Block.java:209)
    from org.jruby.runtime.Interpreted19Block.yield(Interpreted19Block.java:197)
    from org.jruby.runtime.Interpreted19Block.call(Interpreted19Block.java:128)
    from org.jruby.runtime.Block.call(Block.java:89)
    from org.jruby.RubyProc.call(RubyProc.java:261)
    from org.jruby.RubyProc.call19(RubyProc.java:249)
    from org.jruby.RubyProc$INVOKER$i$0$0$call19.call(RubyProc$INVOKER$i$0$0$call19.gen)
    from org.jruby.internal.runtime.methods.DynamicMethod.call(DynamicMethod.java:208)
    from org.jruby.internal.runtime.methods.DynamicMethod.call(DynamicMethod.java:204)
    from org.jruby.runtime.callsite.CachingCallSite.call(CachingCallSite.java:168)
    from org.jruby.ast.CallOneArgNode.interpret(CallOneArgNode.java:57)
    from org.jruby.ast.NewlineNode.interpret(NewlineNode.java:105)
    from org.jruby.evaluator.ASTInterpreter.INTERPRET_METHOD(ASTInterpreter.java:75)
    from org.jruby.internal.runtime.methods.InterpretedMethod.call(InterpretedMethod.java:182)
    from org.jruby.internal.runtime.methods.DefaultMethod.call(DefaultMethod.java:188)

When I however use a similar technique you used in your benchmark script to populate the ring it works fine:

irb(main):041:0* ring = ConsistentHashing::Ring.new; for i in 1..1024; ring << i; end
=> 1..1024

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