Thanks J-D for the answers. My answers in *bold* below.
On Fri, Mar 16, 2012 at 10:52 AM, Jean-Daniel Cryans <[email protected]>wrote: > On Fri, Mar 16, 2012 at 10:40 AM, hdev ml <[email protected]> wrote: > > Does anybody have an answer to this? > > Is there a hurry? Have you tried gathering more data about it? > > *I am doing some capacity planning and wanted an answer for this. Apologies, if I sounded too pushy. Yes I went over the documentation, google search, but could not find reference to this particular problem.* > > > >>> > I created a test table with one column family "cf" with 2 columns "a" > >>> and > >>> > "b", each having value of a 3000 character long string. Maximum > versions > >>> > allowed is 3 and maxfilesize is at default 256M. > >>> > > >>> > In a loop, I put 100000 rows into it, with 3000 character long values > >>> for > >>> > both a and b. Row key is incremental like row00000000 to row00099999. > >>> > > >>> > I applied an outer loop which will run the above 100000 row put > loop, 10 > >>> > times. > >>> > > >>> > After running it 10 times, I found that it split into following > number > >>> of > >>> > regions for every run. > >>> > > >>> > Run Regions > >>> > 1 4 > >>> > 2 5 > >>> > 3 7 > >>> > 4 10 > >>> > 5 13 > >>> > 6 19 > >>> > 7 19 > >>> > 8 19 > >>> > 9 19 > >>> > 10 19 > >>> > > >>> > Question is, why did it stabilize after the 6th run? Shouldn't it > >>> stabilize > > If you let it settle down, does it split later? It might just be that > it was getting behind compactions. > > *Yes, I let it settle down for 2 days. Ran major_compact from the shell and that did nothing. It did not split later though.* > >>> > after 3 runs, because number of versions is 3? After 3 runs, It > should > >>> not > >>> > split further, because new versions are being added but old version > >>> should > >>> > be purged/deleted. Is that a correct statement? > > No, unless you got lucky and the major compactions ran during the > import, but even then it will run 24h after a region is created. > > *As a I mentioned, I already ran major compaction with no positive results.* > J-D >
