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| * kenansulayman | topic: Too much backpressure - logs: http://logs.nodejs.org/leveldb/latest - http://npmjs.org/package/level - UPGRADE TO 0.10.21! http://blog.nodejs.org/2013/10/18/node-v0-10-21-stable/ |
| 01:38:18
| * kenansulayman | topic: Too much backpressure - logs: http://logs.nodejs.org/leveldb/latest - http://npmjs.org/package/level - http://npmjs.org/package/level-hyper - http://npmjs.org/package/level-lmdb |
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| <jerrysv> | rvagg: i think this may be a record for me ever typing anything into an issue, btw |
| 04:12:33
| <rvagg> | want me to keep it going so you can type even more? I have high stamina for this kind of bikeshedding! |
| 04:12:56
| <jerrysv> | rvagg: of course! :) |
| 04:14:08
| <jerrysv> | ~20% performance increase for our use case is pretty compelling to me - i'm hoping to solve it in one way or another |
| 04:14:51
| <jerrysv> | and i'm usually much more terse |
| 04:15:39
| <rvagg> | jerrysv: you know, you could be using your code right now, just plug your fork of leveldown in to levelup and it'll work |
| 04:16:19
| <rvagg> | `levelup('/foo/bar/', { db: require('leveldown-jerrysv') }, function (err, db) { db.db.multiget(.....) }) |
| 04:16:19
| <jerrysv> | rvagg: i know, hence my note about using it as a fork :) |
| 04:17:09
| <jerrysv> | agreed on the odd api on your last comment, though, i don't want to get that weird |
| 04:17:41
| <jerrysv> | i called out folks because i had talked to dominic and mikeal in person about it btw |
| 04:17:52
| <jerrysv> | having rtc going right now is actually useful |
| 04:24:48
| <jerrysv> | rvagg: to better explain our use case: multiple requests for geodata to display on a map through millions of records of various sizes - depending on zoom level could be up to gigs of data. we always know what keys to retrieve, so stream/search isn't appropriate |
| 04:25:26
| <rvagg> | jerrysv: yeah, I understand that, but you're still going to be better off batching a bunch of multigets rather than doing it in one big fat multiget |
| 04:25:48
| <rvagg> | you're having a boundary crossing on the way back out for every entry in your current impl, that's just as expensive as a crossing for every input |
| 04:26:02
| <jerrysv> | 1/2 (+1) expensive |
| 04:26:17
| <jerrysv> | unless #34 gets added in, then that decreases even further |
| 04:27:28
| <jerrysv> | mikeal and i discussed that actually, my c++ is a little too rusty to implement that at the moment. but if that becomes an accepted v. rejected issue then i'm happy to deep dive :) |
| 04:28:25
| <jerrysv> | that implementation took me about 2 hours, which was about 1.5 hours too long for the number of lines of code |
| 04:30:25
| <jerrysv> | in the short term, would you accept a pull request on levelup that implemented multiget by checking for the existence of db.db.multiget and falling back to a node db.db.get and streaming? |
| 04:30:54
| <rvagg> | jerrysv: probably not, you could try and convince the others but we're trying to keep levelup slim |
| 04:31:07
| <jerrysv> | rvagg: why i asked :) |
| 04:31:10
| <rvagg> | we have db.db.xx() for other leveldb specific stuff, it's not so bad |
| 04:31:18
| <rvagg> | db.db.approximateSize() |
| 04:31:19
| <jerrysv> | understood |
| 04:31:27
| <jerrysv> | i've used most of them |
| 04:31:51
| <rvagg> | there's a case for writing a levelup addon to do exactly what you're asking tho |
| 04:31:54
| <jerrysv> | http://github.com/JerrySievert/terraformer-geostore-leveldb |
| 04:32:40
| <jerrysv> | yeah - i'll track down isaac tomorrow - if whiskey happens it will hopefully be easier to talk him into the thought of native extensions |
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| <kenansul1yman> | rvagg: hey |
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| <kenansul1yman> | did you get the mmalecki ping? |
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| <kenansul1yman> | ah i see ty |
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