Enterprise blogs

Links for 2009-01-29

New memcached extension » Andrei Zmievski - The API is more extensive and provides for such features as server-specific hashing, read-through cache and value callbacks, asynchronous multi-gets, and other stuff. It’ll be apparent in the docs.
Open Source Systems Monitoring & Management Software | Hyperic - Hyperic HQ manages web applications wherever they are: in your data center, a virtual environment, or the cloud. Hyperic HQ automatically discovers, monitors, and manages software and network resources, regardless of type or location. HQ provides a single pane view of performance and availability for companies running apps on any or all popular platforms, including Unix, Linux, Windows, Solaris, AIX, HPUX, VMware, and Amazon Web Services. With fast deployment, enterprise security, and extensibility, organizations will save time and meet SLAs.
http://haproxy.1wt.eu/download/1.3/doc/architecture.txt - This document provides real world examples with working configurations. Please note that except stated otherwise, global configuration parameters such as logging, chrooting, limits and time-outs are not described here. 100 cool things you can do with HAProxy
Jonathan Ellis's Programming Blog - Spyced: All you ever wanted to know about writing bloom filters - Bloom filters are surprisingly simple: divide a memory area into buckets (one bit per bucket for a standard bloom filter; more -- typically four -- for a counting bloom filter). To insert a key, generate several hashes per key, and mark the buckets for each hash. To check if a key is present, check each bucket; if any bucket is empty, the key was never inserted in the filter. If all buckets are non-empty, though, the key is only probably inserted -- other keys' hashes could have covered the same buckets. Determining exactly how big to make the filter and how many hashes to use to achieve a given false positive rate is a solved problem; the math is out there.

This is a collection of links I have bookmarked on del.icio.us for the date 2009-01-29