"As soon as inserting started, one node started non-stop full GC. The other two nodes were totally fine"
Just a guest, how did you insert data ? Did you use Batch statements ? On Sat, Jan 16, 2016 at 10:12 PM, Kai Wang <dep...@gmail.com> wrote: > Hi, > > Recently I saw some strange behavior on one of the nodes of a 3-node > cluster. A while ago I created a table and put some data (about 150M) in it > for testing. A few days ago I started to import full data into that table > using normal cql INSERT statements. As soon as inserting started, one node > started non-stop full GC. The other two nodes were totally fine. I stopped > the inserting process, restarted C* on all the nodes. All nodes are fine. > But once I started inserting again, full GC kicked in on that node within a > minute.The insertion speed is moderate. Again, the other two nodes were > fine. I tried this process a couple of times. Every time the same node > jumped into full GC. I even rebooted all the boxes. I checked system.log > but found no errors or warnings before full GC started. > > Finally I deleted and recreated the table. All of sudden the problem went > away. The only thing I can think of is that table was created using STCS. > After I inserted 150M data into it, I switched it to LCS. Then I ran > incremental repair a couple of times. I saw validation and normal > compaction on that table as expected. When I recreated the table, I created > it with LCS. > > I don't have the problem any more but just want to share the experience. > Maybe someone has an theory on this? BTW I am running C* 2.2.4 with CentOS > 7 and Java 8. All boxes have the identical configurations. > > Thanks. >
