blog: clustering part 1

[numinnex]

No description provided.

[justinmclean]

Great post. I checked every latency in the tables against the linked reports and they all match, and the derived unthrottled throughputs recompute correctly from the per-producer data.

A few suggested minor changes:

• Version label: use 0.9.0 instead of 0.9.0-rc.1 on line 60 and in the table rows. It's the same commit, and the 0.9.0 release post quotes these same numbers as 0.9.0, so one name for both is clearer.
• Line 54: v0.9.0-edge.2 was an edge build, not a release. At the ASF a release is what the PMC votes on, so "the first edge build with exactly one server in it" is safer.
• Line 82: line 60 says anything under 1.7× is noise, but this paragraph reads the P99 change (1.36×) as a real cost of the rewrite.
• Line 134: the cold-read throughputs (2,713 and 2,710 MB/s) are derived, so they don't match the 2,812 and 2,833 MB/s that their linked reports show. "Derived as above" would save readers some confusion.
• Line 64: 1,134 MB/s is the cluster's total, not a per-node figure, so "Throughput" fits the header better than "Throughput/node".

[hubcio]

checked against server-0.9.0 (71f29618b), benchmark numbers taken as given. links, the linked table values, the code snippet and the git numbers all check out - the comments are on the parts that do not.