Thanks Jonathan ! memtable_total_space_in_mb is the threshold that is reached.
Kind regards, Sorin On Mon, Sep 12, 2011 at 3:16 PM, Jonathan Ellis <jbel...@gmail.com> wrote: > see memtable_total_space_in_mb at > http://thelastpickle.com/2011/05/04/How-are-Memtables-measured/ > > On Mon, Sep 12, 2011 at 6:55 AM, Sorin Julean <sorin.jul...@gmail.com> > wrote: > > Hi, > > > > I've checked the memtable flush (cassandra 0.8.4) and it seams to me it > > hapens sooner then the threshold is reached. > > > > Here's the threshould's (the default ones calculated for a heap size of > > -Xmx1980M): > > ColumnFamily: idx_graphable (Super) > > Key Validation Class: org.apache.cassandra.db.marshal.BytesType > > Default column value validator: > > org.apache.cassandra.db.marshal.BytesType > > Columns sorted by: > > > org.apache.cassandra.db.marshal.UTF8Type/org.apache.cassandra.db.marshal.UTF8Type > > Row cache size / save period in seconds: 0.0/0 > > Key cache size / save period in seconds: 200000.0/14400 > > Memtable thresholds: 0.5671875/1440/121 (millions of > ops/minutes/MB) > > GC grace seconds: 864000 > > Compaction min/max thresholds: 4/32 > > Read repair chance: 1.0 > > Replicate on write: true > > > > In the logs it seams to me none oh the thresold is reached ( definitively > > minutes threshold is not reached ). > > > > 9-08 20:12:30,136 MeteredFlusher.java (line 62) flushing high-traffic > column > > family ColumnFamilyStore(table='graph', columnFamily='idx_graphable') > > INFO [NonPeriodicTasks:1] 2011-09-08 20:12:30,144 ColumnFamilyStore.java > > (line 1036) Enqueuing flush of > > Memtable-idx_graphable@915643571(4671498/96780112 serialized/live bytes, > > 59891 ops) > > INFO [FlushWriter:111] 2011-09-08 20:12:30,145 Memtable.java (line 237) > > Writing Memtable-idx_graphable@915643571(4671498/96780112 > serialized/live > > bytes, 59891 ops) > > INFO [FlushWriter:111] 2011-09-08 20:12:30,348 Memtable.java (line 254) > > Completed flushing [...]/cassandra/data/graph/idx_graphable-g-23-Data.db > > (4673905 bytes) > > > > > > Could someone clarify it for me ? > > "high-traffic column family" has a special meaning ? > > > > Many thanks, > > Sorin > > > > > > -- > Jonathan Ellis > Project Chair, Apache Cassandra > co-founder of DataStax, the source for professional Cassandra support > http://www.datastax.com >
