Riak(002) Going through dependencies.

After I tar xf’ed the Riak source, I found deps directory containing many packages. This night I go through these.

• basho_stats is apparently a statistics library: variance, min, max and histogram.
• bear also a statistics library.
• bitcask serves as a backend. Other alternatives include LevelDB. This one looks like an interesting porting origin.
• cluster_info dumps status of Erlang clusters.
• ebloom says, it is a NIF wrapper around a basic bloom filter. NIF stands for Native Implemented Function, probably something similar to FFI in Haskell and so on. I didn’t know bloom filter either, but took a glance on the picture in the Wikipedia article.
• edown says Markdown generated from Edoc. Well, yeah, there can be n(n-1) translators.
• eleveldb: Erlang binding to LevelDB.
• eper: Erlang performance related tools.
• erlang_js sounds like a javascript library.
• erlydtl compiles Django Template Language to Erlang bytecode.
• folsom capturing metrics. Probably the previous stat libraries are used by this.
• getopt seems like getting options.
• lager logs in the traditional UNIX way. You can do error, warning and so on.
• lager_syslog sounds like its interface to syslog.
• meck mocking library for Erlang. I like the name.
• merge_index stores ordered sets on disk. OK, this one uses the bloom filter on the memory to find locations on disk.
• mochiweb is a web framework.
• poolboy is a pooling library, like connection pooling. I love the name.
• protobuffs for Protocol Buffers.
• riak_api Riak API on protocol buffers.
• riak_control lets you control your cluster on a web browser.
• riak_core has its own blog post. TODO To be explored.
• riak_kv is a key/value data store on top of riak_core.
• riak_pb contains Protocol Buffers message definitions.
• riak_pipe says it’s “UNIX pipes for Riak”.
• riak_search is a full-text search engine.
• riak_sysmon. System monitoring. Memory usage, ports usage, a slow peer node, and so on.
• riaknostic an interface for sys admins.
• sext is a term_to_binary() library.
• sidejob. Oh what is this? README.md is empty. It involves workers and supervisors, but no clearer idea.
• syslog is an Erlang driver for syslog.
• webmachine is an HTTP framework built around REST principle.

It is a bit surprising to see these proliferating libraries. It seems that Prolog found its way out.