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Attaching a Java debugger to the Scala REPL

December 29, 2009

I’m using the Scala REPL to play around with java libraries and check their runtime behaviors. One of the things I’m using it for is to check how Voldemort’s client is behaving in different setups. For one of the checks I wanted to trace the client threads with an IDE debugger. To attach a debugger… Read more

Baking availability SLA into the code

December 09, 2009

Availability and Partition Tolerance are essential for many distributed systems. A simple (though not comprehensive) way to measure both is using response time SLAs between services as implied from Jeff Darcy‘s observation: Lynch (referring to the 2002 SIGACT paper) also makes the point that unbounded delay is indistinguishable from failure. Time is therefore an essential… Read more

emptyList(), emptySet(), emptyMap()

December 08, 2009

This is the first in a series of posts on under-utilized Java collection types and idioms worth adding to your Java vocabulary. Top 5 Under-utilized Java Collections #1: Empty Collections Every Java programmer has at least once declared a constant to represent an empty collection. It might have looked something like this: static final List<Result>… Read more