The postings on this site are my personal opinions and do not represent the positions, strategies or opinions of my current or former employers.
2015-08-23
2015-08-18
Zehn Mythen über Flüchtlinge
Hier.
2015-08-16
Dann mal wieder los ...
| Auf dem Jüdischen Friedhof Hamburg in Ohlsdorf |
| Die Grabstätten der Sephardim unterscheiden sich deutlich - der sog. Portugiesenfriedhof |
| Auf der Kattwykbrücke |
| Am Waltershofer Hafen - rechts der Burchardkai |
| Elbufer am Schulauer Fährhaus |
| Die Schaarhörn schippert Richtung Elbmündung davon |
| Viel Schiff für einen Sonntag - die YM Uniform fährt in den Hamburger Hafen ein |
2015-08-10
Now I Know How It Feels To Fly
Noch einmal nach Berlin - Anlass: Wisdom in Chains im Bi Nuu, HC vom Feinsten. Support waren Berzerk, Demonwomb und All Out War.
| Auf dem Weg zum Konzert: die Oberbaumbrücke |
| Frontmann Mad Joe Black hat eine außergewöhnliche Stimme und Bühnenpräsenz |
2015-08-03
Sonne und Sonntag ... ab in die Stadtpark
2015-07-16
First Meetup in Hamburg
Today was a meetup of the Big Data & NoSQL Hamburg group. The two talks were about Apache Flink, a quite new stream processing system. We've learned about the key features of Flink and got a live demo of its failover and recovery abilities. My takeaways:
- It offers different APIs (for batch and stream processing).
- It can run in different modes incl. a cluster mode on top of YARN.
- Although running in a JVM it implements a memory management on its own to mitigate OutOfMemory failures by serializing objects to disk when heap space gets terse.
- It uses the Chandy-Lamport algorithm for its fault tolerance. Therefore, checkpoints based on time criteria are inserted into the stream to have a well-defined recovery point - in contrast, Apache Spark uses a size criteria to create its mini batches. It is planned to have more control over the segmentation criteria in the future.
- At least the Scala examples look quite close to the ones I know for Apache Spark.
- It still lacks high availability for its job manager (but it's on the roadmap).
The meetup was hosted by Smaato which also offered food and drinks ... plus, their office offers a nice view over Hamburg:
2015-07-05
True Sounds Of A Revolution
Die Urgesteine des NYHC, Agnostic Front, gastierten heute im Knust. Gut war's - es wurden auch Klassiker wie For My Family und Gotta Go gespielt.
Den Support haben Convict gemacht.
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