Also i miss understand why on empty CF(no any SStable) truncate heavy loads disk??
2012/5/17 ruslan usifov <ruslan.usi...@gmail.com>: > Hello > > I have follow situation on our test server: > > from cassandra-cli i try to use > > truncate purchase_history; > > 3 times i got: > > [default@township_6waves] truncate purchase_history; > null > UnavailableException() > at > org.apache.cassandra.thrift.Cassandra$truncate_result.read(Cassandra.java:20212) > at > org.apache.cassandra.thrift.Cassandra$Client.recv_truncate(Cassandra.java:1077) > at > org.apache.cassandra.thrift.Cassandra$Client.truncate(Cassandra.java:1052) > at > org.apache.cassandra.cli.CliClient.executeTruncate(CliClient.java:1445) > at > org.apache.cassandra.cli.CliClient.executeCLIStatement(CliClient.java:272) > at > org.apache.cassandra.cli.CliMain.processStatementInteractive(CliMain.java:220) > at org.apache.cassandra.cli.CliMain.main(CliMain.java:348) > > > So this looks that truncate goes very slow and too long, than > rpc_timeout_in_ms: 10000 (this can happens because we have very slow > disck on test machine) > > But in in cassandra system log i see follow exception: > > > ERROR [MutationStage:7022] 2012-05-17 12:19:14,356 > AbstractCassandraDaemon.java (line 139) Fatal exception in thread > Thread[MutationStage:7022,5,main] > java.io.IOError: java.io.IOException: unable to mkdirs > /home/cassandra/1.0.0/data/township_6waves/snapshots/1337242754356-purchase_history > at > org.apache.cassandra.db.ColumnFamilyStore.snapshotWithoutFlush(ColumnFamilyStore.java:1433) > at > org.apache.cassandra.db.ColumnFamilyStore.snapshot(ColumnFamilyStore.java:1462) > at > org.apache.cassandra.db.ColumnFamilyStore.truncate(ColumnFamilyStore.java:1657) > at > org.apache.cassandra.db.TruncateVerbHandler.doVerb(TruncateVerbHandler.java:50) > at > org.apache.cassandra.net.MessageDeliveryTask.run(MessageDeliveryTask.java:59) > at > java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) > at > java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) > at java.lang.Thread.run(Thread.java:662) > Caused by: java.io.IOException: unable to mkdirs > /home/cassandra/1.0.0/data/township_6waves/snapshots/1337242754356-purchase_history > at > org.apache.cassandra.io.util.FileUtils.createDirectory(FileUtils.java:140) > at > org.apache.cassandra.io.util.FileUtils.createDirectory(FileUtils.java:131) > at > org.apache.cassandra.db.ColumnFamilyStore.snapshotWithoutFlush(ColumnFamilyStore.java:1409) > ... 7 more > > > Also i see that in snapshort dir already exists > 1337242754356-purchase_history directory, so i think that snapshort > names that generate cassandra not uniquely. > > PS: We use cassandra 1.0.10 on Ubuntu 10.0.4-LTS
