| “write something clever here”Comments for Ed Anuff

Comment on “Owning it” by Ed Anuff

Ed Anuff — Thu, 21 Mar 2013 00:12:33 +0000

Good point, that’s definitely what he’s doing in this case. My feeling has been that he crosses that line quite a bit, and it’s only when it’s really egregious that most people notice.

Comment on “Owning it” by Dave Aiello

Dave Aiello — Thu, 21 Mar 2013 00:08:16 +0000

The unfortunate part of John Gruber’s criticisms of Apple’s decision to hire Kevin Lynch is that he exposes himself to the the charge that he is reacting as a fan would react, rather than how a journalist or an analyst would.

Philadelphia sports fans are notorious for holding grudges. When the Flyers, Eagles, Phillies, or 76ers obtain the services of a star from one of their competitors, Philadelphia fans will criticize the trade, with “logic” like this.

“I didn’t like the way he played as a Ranger (or Giant or Met or Knick), so I think this trade is a bad deal.”

This is questionable analysis. You should always evaluate players on what they can do for your team, rather than on how these players contributed to an opponent’s strategy in the past.

I don’t think Gruber has reacted in this fan-like way very much in the recent past. I’m sorry to see him react this way now.

Comment on Secondary indexes in Cassandra by Ed Anuff

Ed Anuff — Wed, 12 Dec 2012 19:22:41 +0000

This allows you to repair the index at read. Cassandra isn’t inherently unsafe, but creating a ledger of past values means the index can always be returned to a consistent state. The example code doesn’t show this, but the Usergrid code does have a repair utility that fixes inconsistent indexes using this information to remove old index values.

Comment on Indexing in Cassandra by Ed Anuff

Ed Anuff — Wed, 12 Dec 2012 19:20:13 +0000

Updating a value requires walking back the inbound indexes. The sample code shows an implementation of this.

Comment on Indexing in Cassandra by Ed Anuff

Ed Anuff — Wed, 12 Dec 2012 19:19:27 +0000

That’s one of the reasons supercolumns are no longer recommended and instead composite columns are suggested.

Comment on Indexing in Cassandra by Amresh1002

Amresh1002 — Sun, 07 Oct 2012 04:58:46 +0000

In Inverted-indexes Using Supercolumns, would it be possible to search on Last names (which are super column names)? AFAIK, secondary indexes on super column names can’t be defined.

Comment on Indexing in Cassandra by Orrgal

Orrgal — Thu, 23 Aug 2012 02:14:43 +0000

but what do you do about updates to stored values.

if you have groupCF storing users with the column name being name:id

A johnny:h23854uf923 sammy:fh43872h34fg8 bobby:hf3127f31273

and now you want to remove johnny but johnny changed his name and is now called jonathan:h23854uf923 (same id).

the delete message will have jonathan:h23854uf923 as the column to delete so johnny will not be deleted from the group.

Comment on Secondary indexes in Cassandra by Alon Pilberg

Alon Pilberg — Mon, 23 Jul 2012 08:08:04 +0000

Hello Ed, can you elaborate on need for the CF Container_Item_Property_Index_Entries? You mention that “for a number of reasons related to Cassandra’s model of eventual consistency … will not reliably work” and “it’s a really good idea to make sure you understand why this CF is necessary”, yet it is unclear why that is actually the case. Without further explanations, it sounds like any and all Cassandra reads are inherently unsafe. Is the purpose of such a CF to ensure consistency when multiple writes are present, or to assist with recovery in case an operation is interrupted midway?

Comment on Secondary indexes in Cassandra by Cyril Auburtin

Cyril Auburtin — Sun, 13 May 2012 23:34:31 +0000

Would it possible to do:

Get Items In Container(container_id) Where Property(property_name) Equals Value(property_value) And Property(other_property_name) Equals Value(other_property_value)?

maybe by extending the model

thx and congrats on bringing this model of query much more performant

Comment on Usergrid is now part of Apigee by Aaron

Aaron — Wed, 18 Jan 2012 11:23:29 +0000

Congratulations on the acquisition. Good luck with the next phase of building out UserGrid.