electrum

39 ms·

211.
A Vibrating Watch That Messes With Your Perception of Time(wired.com)
1 points by electrum 13y ago|1 comments
212.
Impala v Hive(vision.cloudera.com)
1 points by electrum 13y ago|0 comments
213.
by electrum 13y ago
Oracle's documentation is excellent and is WAY more comprehensive than PostgreSQL. For example, most of PostgreSQL's SQL functions have a single line in a table to describe them, whereas each one in Oracle has it's own sectio
214.
by electrum 13y ago
Rails migrations do not support creating foreign keys in the database, but you can do it with this library: https://github.com/matthuhiggins/foreigner
215.
by electrum 13y ago
This is a very common problem for buggy Java programs that have different versions of the same class on the classpath. The JVM will take the first instance of a class it finds on the classpath, so some orders of the classpath will work and
216.
by electrum 13y ago
The drag and drop works but it's a bit weird. You have to drag the tab into the other editor window, not on the tab bar.
217.
by electrum 13y ago
No, it creates an additional editor area that can have any number of files open in it. You drag files between the areas or open the same file in multiple areas. You can continue splitting any area vertically or horizontally to create a con
218.
by electrum 13y ago
I replaced the mouse a long time ago with a Magic Trackpad and never looked back.
219.
by electrum 13y ago
Facebook uses TAO for graphs: https://www.facebook.com/notes/facebook-engineering/tao-the-... MySQL is used for storing textual user content like comments, etc. See https://www.facebook.com/MySQLat
220.
by electrum 13y ago
The benefits would be that you could query them using full ANSI SQL and could join them with other data sources such as Hive. One of the benefits of Presto's connector architecture is that it allows queries across multiple disparate da
221.
by electrum 13y ago
Presto does read Hive data directly out of HDFS, bypassing Hive/MapReduce. However, neither HDFS nor the file formats like RCFile are efficient. The entire design of HDFS makes it difficult to build a real column store. Having a native
222.
by electrum 13y ago
Wow, I didn't realize they had a VM image available. We haven't tried it, but there's no reason why it wouldn't work. Try it and let us know!
223.
by electrum 13y ago
Facebook is always looking for interns and has a great intern program. See https://www.facebook.com/careers/department?dept=interns&req...
224.
by electrum 13y ago
Please see this comment: https://news.ycombinator.com/item?id=6684785
225.
by electrum 13y ago
Most of the data in our data warehouse is stored as relational records using Hive's RCFile format, though we are actively working on converting it to the new ORCFile format. The Hive data model supports complex types including arrays,
226.
by electrum 13y ago
When running against Hive data, Presto is similar to many analytic databases in that queries typically perform a full table or partition scan, so "point lookups" that search for one or a few records will be much less efficient tha
227.
by electrum 13y ago
1) Presto always returns exact answers, with the exception of the approximate aggregate functions approx_distinct() and approx_percentile() (see http://prestodb.io/docs/current/functions/aggregate.html ). We d
228.
by electrum 13y ago
Thanks! Presto supports arbitrary SQL including some basic window functions (full support is on our roadmap). I've used window functions at previous companies with commercial data warehouses to do some basic click stream analysis: htt
229.
by electrum 13y ago
Hi, I work on Presto at Facebook and would be happy to answer any questions about it.
230.
by electrum 13y ago
As the documentation for Random says: "Instances of java.util.Random are not cryptographically secure. Consider instead using java.security.SecureRandom to get a cryptographically secure pseudo-random number generator for use by securi
231.
by electrum 13y ago
GitHub really needs to implement this for Pull Request notifications.
232.
by electrum 14y ago
If you use Java with Thrift, you should check out Swift: https://github.com/facebook/swift Swift is an annotation-based library for creating Thrift types and services. It was created to be an alternative to code generation, which is gener
233.
by electrum 14y ago
The text is blurry on the Retina MBP in Chrome. Looks fine in Safari.
234.
by electrum 14y ago
You use EBS and back it up using the built-in snapshot functionality, and/or back it up another way. RDS, which is presumably based on EBS, provides backups and snapshots for precisely this reason.
235.
by electrum 14y ago
Amazon only claims "obscene number of nines" for S3 durability (99.999999999%). And this claim seems to be accurate: I've never seen a publicly reported case of anyone losing data. Anytime you read their forums about people reporting data l
236.
by electrum 14y ago
This problem seems to be fixed in recent versions of Oracle: https://blogs.oracle.com/optimizer/entry/explain_adaptive_cu...
237.
by electrum 14y ago
There are two books we recommend to every developer: Effective Java: http://java.sun.com/docs/books/effective/ Java Concurrency in Practice: http://www.javapuzzlers.com/ Everything else is covered by the excellent online documentation,
238.
by electrum 15y ago
The caching servers are typically close to the user: at your ISP, in your office's server closet, in your data center, etc. In the case of public recursive DNS providers such as OpenDNS and Google Public DNS, this requires a recent extensi
239.
by electrum 15y ago
There is already an excellent native port of Snappy to Java: https://github.com/dain/snappy
240.
by electrum 15y ago
IntelliJ IDEA or any of the JetBrains IDEs based on that platform (RubyMine, WebStorm, etc.) have this built-in: right click in the gutter and choose Annotate. Mouse over a line to see the commit message for the most recent change to that

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