Thanks. On Thu, Jan 20, 2011 at 10:10 AM, Todd Lipcon <[email protected]> wrote:
> The metrics were parsed from the gc log with -XX:+PrintFLSStatistics=1 on. > > I created new YCSB workloads for it. I updated the doc a bit and attached > it > as PDF to this new JIRA: > > https://issues.apache.org/jira/browse/HBASE-3455 > > <https://issues.apache.org/jira/browse/HBASE-3455>-Todd > > On Thu, Jan 20, 2011 at 9:48 AM, Ted Dunning <[email protected]> > wrote: > > > Also, can you say what YCSB workload that used? > > > > On Thu, Jan 20, 2011 at 9:33 AM, Todd Lipcon <[email protected]> wrote: > > > > > I did some experiments to understand our full GC issues better last > > night. > > > Here are the results: > > > http://people.apache.org/~todd/hbase-fragmentation/ > > > > > > <http://people.apache.org/~todd/hbase-fragmentation/>Basically my > > > conclusion > > > here is that (for these YCSB workloads) the memstore is way worse for > > heap > > > fragmentation than the block cache. > > > > > > Also we now have some tools and reference for comparison if we make any > > > changes to memstore to try to combat this issue. > > > > > > -Todd > > > -- > > > Todd Lipcon > > > Software Engineer, Cloudera > > > > > > > > > -- > Todd Lipcon > Software Engineer, Cloudera >
