Re: Distance between 2 points Lucene Spatial

2014-12-22 Thread david.w.smi...@gmail.com
I forgot this part of your question. To go from degrees to KM, multiply by DistanceUtils.DEG_TO_KM. ~ David Smiley Freelance Apache Lucene/Solr Search Consultant/Developer http://www.linkedin.com/in/davidwsmiley On Mon, Dec 22, 2014 at 9:35 AM, wrote: > > Thanks for the suggestion. > > I am usi

RE: Distance between 2 points Lucene Spatial

2014-12-22 Thread Ankit.Murarka
Thanks for the suggestion. I am using Lucene Vincenty to find the distance but the output is strange. I cannot figure out how to convert the output to metres/kilo metres. After extensive search on google, I found GeoDesy source code which gives me distance in metres. This is also the implementa

Re: Distance between 2 points Lucene Spatial

2014-12-22 Thread david.w.smi...@gmail.com
Hi Ankit, Vincenty is the most accurate one — it is the benchmark for the other 2’s tests for the true answer. In theory it produces the same answers as the other 2 simpler formulas you mention but is “numerically robust” for computers. Note that the world model used by Spatial4j when in “geo” m

Re: Lucene Spatial Implementation for Points within Polygon.

2014-12-22 Thread david.w.smi...@gmail.com
Hello. You have stated the use-case so generically that it’s not clear if you should index the polygon set and query by the point set, or the reverse. Generally, you should index the set that is known in-advance and then query by the other, the set that is generally not known. Assuming this is th

RE: BTRFS ?

2014-12-22 Thread Uwe Schindler
Hi, In fact, the shallow copy possibility (called "cp --reflink=always") in btrfs and other file systems that support it is really interesting. It would be cool in Java 7+ 's Files.copy(Path, Path, CopyOption) could use this with an additional CopyOption - maybe Java 9. The trick here is to clo

Re: BTRFS ?

2014-12-22 Thread Dawid Weiss
Very interesting, have to take a closer look. Thanks Uwe. D. On Mon, Dec 22, 2014 at 11:39 AM, Uwe Schindler wrote: > Hi Dawid, > > there are cool things that might be useful just not for Lucene's Java code. > Like ZFS it now has snapshot functionality and you can copy files mostly > without d

RE: BTRFS ?

2014-12-22 Thread Uwe Schindler
Hi Dawid, there are cool things that might be useful just not for Lucene's Java code. Like ZFS it now has snapshot functionality and you can copy files mostly without doing I/O (shallow-copy, it uses copy-on-write semantics to do that). This might be useful for backup purposes. I know we did mo

"batch-update"-pattern, NoMergeScheduler?

2014-12-22 Thread Clemens Wyss DEV
One of our indexes is updated completely quite frequently -> "batch update" or "re-index". If so more than 2million documents are added/updated to/in the very index. This creates an immense IO load on our system. Does it make sense to set merge scheduler to NoMergeScheduler (and/or MergePolicy