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
