​Hello, I am using the 'development' version 2.1-rc2.
With one node (=localhost), I get timeouts trying to connect to C* after running a 'DROP KEYSPACE' command. I have following error messages in system.log : INFO [SharedPool-Worker-3] 2014-07-09 16:29:36,578 MigrationManager.java:319 - Drop Keyspace 'test_main' (...) ERROR [MemtableFlushWriter:6] 2014-07-09 16:29:37,178 CassandraDaemon.java:166 - Exception in thread Thread[MemtableFlushWriter:6,5,main] java.lang.RuntimeException: Last written key DecoratedKey(91e7f660-076f-11e4-a36d-28d2444c0b1b, 52446dde90244ca49789b41671e4ca7c) >= current key DecoratedKey(91e7f660-076f-11e4-a36d-28d2444c0b1b, 52446dde90244ca49789b41671e4ca7c) writing into ./../data/data/test_main/user-911d5360076f11e4812d3d4ba97474ac/test_main-user.user_account-tmp-ka-1-Data.db at org.apache.cassandra.io.sstable.SSTableWriter.beforeAppend(SSTableWriter.java:172) ~[apache-cassandra-2.1.0-rc2.jar:2.1.0-rc2] at org.apache.cassandra.io.sstable.SSTableWriter.append(SSTableWriter.java:215) ~[apache-cassandra-2.1.0-rc2.jar:2.1.0-rc2] at org.apache.cassandra.db.Memtable$FlushRunnable.writeSortedContents(Memtable.java:351) ~[apache-cassandra-2.1.0-rc2.jar:2.1.0-rc2] at org.apache.cassandra.db.Memtable$FlushRunnable.runWith(Memtable.java:314) ~[apache-cassandra-2.1.0-rc2.jar:2.1.0-rc2] at org.apache.cassandra.io.util.DiskAwareRunnable.runMayThrow(DiskAwareRunnable.java:48) ~[apache-cassandra-2.1.0-rc2.jar:2.1.0-rc2] at org.apache.cassandra.utils.WrappedRunnable.run(WrappedRunnable.java:28) ~[apache-cassandra-2.1.0-rc2.jar:2.1.0-rc2] at com.google.common.util.concurrent.MoreExecutors$SameThreadExecutorService.execute(MoreExecutors.java:297) ~[guava-16.0.jar:na] at org.apache.cassandra.db.ColumnFamilyStore$Flush.run(ColumnFamilyStore.java:1054) ~[apache-cassandra-2.1.0-rc2.jar:2.1.0-rc2] at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) ~[na:1.7.0_55] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) ~[na:1.7.0_55] at java.lang.Thread.run(Thread.java:744) ~[na:1.7.0_55] Then, I can not connect to the Cluster anymore from my app (Java Driver 2.1-SNAPSHOT) and got in application logs : com.datastax.driver.core.exceptions.NoHostAvailableException: All host(s) tried for query failed (tried: /127.0.0.1:9042 (com.datastax.driver.core.exceptions.DriverException: Timeout during read)) at com.datastax.driver.core.exceptions.NoHostAvailableException.copy(NoHostAvailableException.java:65) at com.datastax.driver.core.DefaultResultSetFuture.extractCauseFromExecutionException(DefaultResultSetFuture.java:258) at com.datastax.driver.core.DefaultResultSetFuture.getUninterruptibly(DefaultResultSetFuture.java:174) at com.datastax.driver.core.AbstractSession.execute(AbstractSession.java:52) at com.datastax.driver.core.AbstractSession.execute(AbstractSession.java:36) (...) Caused by: com.datastax.driver.core.exceptions.NoHostAvailableException: All host(s) tried for query failed (tried: /127.0.0.1:9042 (com.datastax.driver.core.exceptions.DriverException: Timeout during read)) at com.datastax.driver.core.RequestHandler.sendRequest(RequestHandler.java:103) at com.datastax.driver.core.RequestHandler$1.run(RequestHandler.java:175) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) at java.lang.Thread.run(Thread.java:745) I can still connect through CQLSH but if I run (again) a "DROP KEYSPACE" command from CQLSH, I get the following error : errors={}, last_host=127.0.0.1 Now, on a 2 nodes cluster I also have a similar issue but the error's stacktrace is different : >From application logs : 17971 [Cassandra Java Driver worker-2] WARN com.datastax.driver.core.Cluster - No schema agreement from live replicas after 10000 ms. The schema may not be up to date on some nodes. >From system.log : INFO [SharedPool-Worker-2] 2014-07-10 09:04:53,434 MigrationManager.java:319 - Drop Keyspace 'test_main' (...) ERROR [MigrationStage:1] 2014-07-10 09:04:56,553 CommitLogSegmentManager.java:304 - Failed waiting for a forced recycle of in-use commit log segments java.lang.AssertionError: null at org.apache.cassandra.db.commitlog.CommitLogSegmentManager.forceRecycleAll(CommitLogSegmentManager.java:299) ~[apache-cassandra-2.1.0-rc2.jar:2.1.0-rc2] at org.apache.cassandra.db.commitlog.CommitLog.forceRecycleAllSegments(CommitLog.java:160) [apache-cassandra-2.1.0-rc2.jar:2.1.0-rc2] at org.apache.cassandra.db.DefsTables.dropColumnFamily(DefsTables.java:516) [apache-cassandra-2.1.0-rc2.jar:2.1.0-rc2] at org.apache.cassandra.db.DefsTables.mergeColumnFamilies(DefsTables.java:300) [apache-cassandra-2.1.0-rc2.jar:2.1.0-rc2] at org.apache.cassandra.db.DefsTables.mergeSchemaInternal(DefsTables.java:187) [apache-cassandra-2.1.0-rc2.jar:2.1.0-rc2] at org.apache.cassandra.db.DefsTables.mergeSchema(DefsTables.java:164) [apache-cassandra-2.1.0-rc2.jar:2.1.0-rc2] at org.apache.cassandra.service.MigrationManager$2.runMayThrow(MigrationManager.java:393) [apache-cassandra-2.1.0-rc2.jar:2.1.0-rc2] at org.apache.cassandra.utils.WrappedRunnable.run(WrappedRunnable.java:28) [apache-cassandra-2.1.0-rc2.jar:2.1.0-rc2] at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471) [na:1.7.0_45] at java.util.concurrent.FutureTask.run(FutureTask.java:262) [na:1.7.0_45] at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) [na:1.7.0_45] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) [na:1.7.0_45] at java.lang.Thread.run(Thread.java:744) [na:1.7.0_45] In both cases, I have to restart the C* server, so that I can connect again from my application. The connection from CQLSH is still possible but some key-space related commands fail. NB : I also get sometimes the following error on my nodes (I do not know if there is any link with the topic) : ERROR [CompactionExecutor:62] 2014-07-10 08:49:02,059 CassandraDaemon.java:166 - Exception in thread Thread[CompactionExecutor:62,1,main] java.lang.NullPointerException: null at org.apache.cassandra.cache.CounterCacheKey.getPathInfo(CounterCacheKey.java:53) ~[apache-cassandra-2.1.0-rc2.jar:2.1.0-rc2] at org.apache.cassandra.cache.AutoSavingCache$Writer.saveCache(AutoSavingCache.java:215) ~[apache-cassandra-2.1.0-rc2.jar:2.1.0-rc2] at org.apache.cassandra.db.compaction.CompactionManager$11.run(CompactionManager.java:1052) ~[apache-cassandra-2.1.0-rc2.jar:2.1.0-rc2] at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471) ~[na:1.7.0_55] at java.util.concurrent.FutureTask.run(FutureTask.java:262) ~[na:1.7.0_55] at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) ~[na:1.7.0_55] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) [na:1.7.0_55] at java.lang.Thread.run(Thread.java:744) [na:1.7.0_55] It seems to be a bug (is it known ?). Or do you have any clue on how I can solve that ? Thanks for your help Fabrice