Thanks Joey. We have many counters with long keys. We update them frequently. That is why I think it should help us.
Thanks again, Vaibhav, GumGum On Sat, Jul 9, 2011 at 6:12 PM, Joey Echeverria <[email protected]> wrote: > > Here are my questions: > > 1) Is this correct? Will it really reduce the amount of data it loads in > > memory? > > It will only reduce memory usage if you currently have multiple > versions of the same cell. > > > 2) How do I do this in production? I know that HBase shell supports alter > > statement. Do you recommend using that? > > If I execute an alter statement, will it immediately start lot of > activity > > there by degrading our real time performance? > > Yes, you should use the shell. You'll need to disable the table first. > No activity should happen immediately. If you currently have multiple > version of any cells, they will disappear during the next major > compaction. > > > 3) Do we need to do anything else before or after we run alter command? > > You can run a full compaction if you want to make sure that additional > versions are deleted right away. > > -Joey > > -- > Joseph Echeverria > Cloudera, Inc. > 443.305.9434 >
