Kevin Would love to hear your thoughts around hbase not big table.
Thanks inder "you are the average of 5 people you spend the most time with" On Aug 4, 2013 8:15 PM, "Kevin O'dell" <[email protected]> wrote: > Hi Vimal, > > It really depends on your usage pattern but HBase != Bigtable. > On Aug 4, 2013 2:29 AM, "Vimal Jain" <[email protected]> wrote: > > > Hi, > > I have tested read performance after reducing number of column families > > from 14 to 3 and yes there is improvement. > > Meanwhile i was going through the paper published by google on BigTable. > > It says > > > > "It is our intent that the number of distinct column > > families in a table be small (in the hundreds at most), and > > that families rarely change during operation." > > > > So Is that theoretical value ( 100 CFs ) or its possible but not with > the > > current version of Hbase ? > > > > > > On Tue, Jul 2, 2013 at 12:48 AM, Viral Bajaria <[email protected] > > >wrote: > > > > > On Mon, Jul 1, 2013 at 10:06 AM, Vimal Jain <[email protected]> wrote: > > > > > > > Sorry for the typo .. please ignore previous mail.. Here is the > > corrected > > > > one.. > > > > 1)I have around 140 columns for each row , out of 140 , around 100 > > > columns > > > > hold java primitive data type , remaining 40 columns contain > > serialized > > > > java object as byte array(Inside each object is an ArrayList). Yes , > I > > do > > > > delete data but the frequency is very less ( 1 out of 5K operations > ). > > I > > > > dont run any compaction. > > > > > > > > > > This answers the type of data in each cell not the size of data. Can > you > > > figure out the average size of data that you insert in that size. For > > > example what is the length of the byte array ? Also for java primitive, > > is > > > it 8-byte long ? 4-byte int ? > > > In addition to that, what is in the row key ? How long is that in > bytes ? > > > Same for column family, can you share the names of the column family ? > > How > > > about qualifiers ? > > > > > > If you have disabled major compactions, you should run it once a few > days > > > (if not once a day) to consolidate the # of files that each scan will > > have > > > to open. > > > > > > 2) I had ran scan keeping in mind the CPU,IO and other system related > > > > parameters.I found them to be normal with system load being 0.1-0.3. > > > > > > > > > > How many disks do you have in your box ? Have you ever benchmarked the > > > hardware ? > > > > > > Thanks, > > > Viral > > > > > > > > > > > -- > > Thanks and Regards, > > Vimal Jain > > >
