lenary

I've had one question about subpar performance in Riak 2.0's CRDTs. I thought I'd write this so that people can more easily diagnose these issues, without the CRDT team having to step in every time.

An Example: A Client was having problems with the performance fetching and updating sets. The issue manifested itself with poor fetch performance.

So, how do you go about debugging/diagnosing this?

aphyr

com.factual.polyglot.JSFunction.call(JSFunction.java:54)
	com.factual.scarecrow.rules.Function.call(Function.java:27)
	com.factual.scarecrow.rules.FunctionContainer.call(FunctionContainer.java:42)
	sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
	sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	java.lang.reflect.Method.invoke(Method.java:606)
	org.jruby.javasupport.JavaMethod.invokeDirectWithExceptionHandling(JavaMethod.java:425)
	org.jruby.javasupport.JavaMethod.invokeDirect(JavaMethod.java:292)
	org.jruby.java.invokers.InstanceMethodInvoker.call(InstanceMethodInvoker.java:44)

lenary

I'm going travelling this summer. Here's to where:

• Washington DC (~ 3 nights)
• Austin, TX (~ 3 nights)
• San Diego (~ 3 nights)
• San Francisco (~ 1 week)
• Portland (~ 3 nights)
• Seattle (~ 3 nights)
• NYC (more than 3 nights, less than a week)
• Boston (~ 1.5 weeks)

seancribbs

%% @doc Reports on percentage of modules, functions and types that are
%% documented.
-module(edoc_stats).
-export([file/1, file/2, files/1, files/2, aggregate/1, report/1, report_files/1, report_files/2]).
-include_lib("xmerl/include/xmerl.hrl").
-import(xmerl_xpath, [string/2]).

-define(QUERY_FUNS, [ fun module_has_description/2
                    , fun functions_have_descriptions/2
                    , fun types_have_descriptions/2

lkuper

"Consensus is impossible" is a gloss for "there's always an execution that doesn't terminate".

Once you've internalized that you can't distinguish slow nodes from dead nodes, how do you deal with that?

"When you're engaged in a battle of wits with a Sicilian and death is on the line, you certainly need to think about epistemic logic."

A correct distributed program achieves (nontrivial) distributed property X. So we need to ask:

1. is X even attainable?
2. what's the cheapest* protocol that gets me X? (* according to some cost metric)

binarytemple

autoscale: true build-lists: true slidenumbers: true

Tracing Riak with Redbug

An example of how to use Redbug to trace Riak internals, taking as an example an inexplicably failing secondary index range query.

---

phred

Solving Embarrasingly Simple Problems in Factor

This Article has struck a chord with me. I'm not an Erlang-er, but the style he describes of "writing many tiny functions" strongly reminds me of why I've come to love Factor.

Drink Beer when Delicious

ericmoritz

-module(erlmonad).

-compile(export_all).


half(X) when X rem 2 =/= 0 ->
    nothing;
half(X) ->
    X div 2.

bookshelfdave

/* comments */
// comments

Connections, misc

// default connection, this is used if a named connection 
// is not specified in a fetch, put, delete

argv0

simple_test() ->
    {ok, EC} = erasuerl:new(),
    {ok, Bin} = file:read_file("/usr/share/dict/words"),
    {MD, KBins, MBins} = erasuerl:encode(EC, Bin),
    [K1, K2, K3, K4, K5, K6, K7, K8, K9] = KBins,
    [M1, M2, M3, M4] = MBins,
    KBins2 = [undefined, undefined, undefined, K4, K5, K6, K7, K8, K9],
    MBins2 = [undefined, M2, M3, M4],
    Bin = iolist_to_binary(erasuerl:decode(EC, MD, KBins2, MBins2)).