Dear Wiki user, You have subscribed to a wiki page or wiki category on "Cassandra Wiki" for change notification.
The "FAQ" page has been changed by JonathanEllis. The comment on this change is: expand memory pressure section. http://wiki.apache.org/cassandra/FAQ?action=diff&rev1=52&rev2=53 -------------------------------------------------- <<Anchor(slows_down_after_lotso_inserts)>> == Why does Cassandra slow down after doing a lot of inserts? == - This is a symptom of having Cassandra's memtable thresholds too high, resulting in a storm of GC operations as the JVM frantically tries to free enough heap to continue to operate. + This is a symptom of memory pressure, resulting in a storm of GC operations as the JVM frantically tries to free enough heap to continue to operate. You can increase the amount of memory the JVM uses, or decrease the insert threshold before Cassandra flushes its memtables. See MemtableThresholds for details. Setting your cache sizes too large can result in memory pressure. + + Writing with ConsistencyLevel.ZERO is also an excellent way to run out of memory, since the server buffers up the write locally leaving the client free to send more. <<Anchor(existing_data_when_adding_new_nodes)>> == What happens to existing data in my cluster when I add new nodes? ==
