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1. Introduction to the replicator database

A database where you PUT/POST documents to trigger replications and you DELETE to cancel ongoing replications. These documents have exactly the same content as the JSON objects we used to POST to /_replicate/ (fields "source", "target", "create_target", "continuous", "doc_ids", "filter", "query_params".

Replication documents can have a user defined "_id". Design documents (and _local documents) added to the replicator database are ignored.

The default name of this database is _replicator. The name can be changed in the .ini configuration, section [replicator], parameter db.

2. Basics

fdmanana

diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index da41a0c371bc..1e77371035ac 100644
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -1846,6 +1846,29 @@ static ssize_t check_direct_IO(struct btrfs_fs_info *fs_info,
 	return 0;
 }
 
+static size_t dio_fault_in_size(const struct iov_iter *iov, size_t prev_left)
+{

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Issue

On Mac OS X Lion (64bits at least), we get random "Bus error 10" (or "Segmentation fault: 11") crashes if init:restart/0 is called and the crypto application is loaded. Why? XCode 4.1 ships an OpenSSL version that deprecates many functions used by OTP's crypto NIF (lib/crypto/c_src/crypto.c).

Example:

$ erl

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From b3895efe1cff61182dfe76fed25c00d6cb590a71 Mon Sep 17 00:00:00 2001
From: Filipe David Borba Manana <fdmanana@apache.org>
Date: Wed, 16 Jan 2013 10:18:36 +0000
Subject: [PATCH] Fix memory leak in efile_drv

When the port's stop callback (file_stop) is invoked, we
schedule a file close task (FILE_CLOSE_ON_PORT_EXIT) that
will be picked up by an async thread, to avoid blocking the
scheduler thread for too long. However, because after this
task is executed the port is not alive anymore, its callback

fdmanana

From 0a8c3023b5c29463b58d09fc574c5f8f3bd36b99 Mon Sep 17 00:00:00 2001
From: Filipe David Borba Manana <fdmanana@gmail.com>
Date: Fri, 23 Mar 2012 13:48:15 +0000
Subject: [PATCH] Add support for Mac OS X 64bit builds with GYP

Note that in order to build for 64bits mode, you'll have
to specify the target architecture explicitely, the default
is still 32bits for Mac OS X.

Example with make:

fdmanana

Before COUCHDB-1186

fdmanana 23:21:05 ~/git/hub/slow_couchdb (master)> docs=500000 batch=5000 ./bench.sh wow.tpl 
Server: CouchDB/1.2.0a-a68a792-git (Erlang OTP/R14B03)
{"couchdb":"Welcome","version":"1.2.0a-a68a792-git"}

[INFO] Created DB named `db1'
[INFO] Uploaded 5000 documents via _bulk_docs
(....)
[INFO] Uploaded 5000 documents via _bulk_docs

fdmanana

# comment lines start with a sharp (#)

{
  "type": "#{pick(human,orc,elf,dwarf)}",
  "category": "#{pick(warrior,assassin,thief,wizard)}",
  "ratio": #{random_int(0, 1)}.#{random_int(0, 9)},
  "level": #{random_int(1, 20)},
  "data1": "#{random_string(40)}",
  "data2": "#{random_string(50)}",
  "data3": "#{random_string(35)}",

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Client side API

Start a gen_server programmatically

gen_server:start(ModuleName, Arguments, Options) -> {ok, Pid} | {error, Reason}

gen_server:start(ServerName, ModuleName, Arguments, Options) -> {ok, Pid} | {error, Reason}

fdmanana

-module(user_default).

-export([proc_count/1, proc_count/0,
         proc_mem/2, proc_mem/1, proc_mem/0,
         matching/2, matching/1]).


proc_info(X, Info) ->
    case proplists:get_value(X, Info) of
        {proc_lib, init_p, _} ->

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-module(skew).

-export([new/0, size/1, in/3, out/2, min/1]).

-define(null, []).

new() ->
    ?null.

size(?null) ->