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
