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From Paco Trujillo <F.Truji...@genetwister.nl>
Subject nodetool drain running for days
Date Wed, 06 Apr 2016 06:12:28 GMT
We are having performance problems with our cluster regarding to timeouts when repairs are
running or massive deletes. One of the advice I received was update our casssandra version
from 2.0.17 to 2.2. I am draining one of the nodes to start the upgrade and the drain is running
now for two days. In the logs  only see log like these from time to time:

INFO [ScheduledTasks:1] 2016-04-06 08:17:10,987 ColumnFamilyStore.java (line 808) Enqueuing
flush of Memtable-sstable_activity@1382334976(15653/226669 serialized/live bytes, 6023 ops)
INFO [FlushWriter:1468] 2016-04-06 08:17:10,988 Memtable.java (line 362) Writing Memtable-sstable_activity@1382334976(15653/226669
serialized/live bytes, 6023 ops)
INFO [ScheduledTasks:1] 2016-04-06 08:17:11,004 ColumnFamilyStore.java (line 808) Enqueuing
flush of Memtable-compaction_history@1425848386(1599/15990 serialized/live bytes, 51 ops)
INFO [FlushWriter:1468] 2016-04-06 08:17:11,012 Memtable.java (line 402) Completed flushing
/var/lib/cassandra/data/system/sstable_activity/system-sstable_activity-jb-4826-Data.db (6348
bytes) for commitlog position ReplayPosition(segmentId=1458540068021, position=1198022)
INFO [FlushWriter:1468] 2016-04-06 08:17:11,012 Memtable.java (line 362) Writing Memtable-compaction_history@1425848386(1599/15990
serialized/live bytes, 51 ops)
INFO [FlushWriter:1468] 2016-04-06 08:17:11,039 Memtable.java (line 402) Completed flushing
/var/lib/cassandra/data/system/compaction_history/system-compaction_history-jb-3491-Data.db
(730 bytes) for commitlog position ReplayPosition(segmentId=1458540068021, position=1202850)

Should I wait or just stop the node and start the migration?

Another question, I have check the changes in 3.0 and I do not see any incompatibilities with
the features we are using at this moment or with our actual hardware (apart from the java
version). Probably more people ask this, but there is some important reason for not upgrade
the cluster?




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