The first part of the name is the current system time in milliseconds. If you run it twice do you get log messages about failing to create the same directory twice ?
Cheers ----------------- Aaron Morton Freelance Developer @aaronmorton http://www.thelastpickle.com On 21/05/2012, at 5:09 AM, ruslan usifov wrote: > I think as you, but this is not true, there are not any permissions > issue. And as i said before, cassandra try to create directory for > snapshort that already exists > > 2012/5/19 Jonathan Ellis <jbel...@gmail.com>: >> Sounds like you have a permissions problem. Cassandra creates a >> subdirectory for each snapshot. >> >> On Thu, May 17, 2012 at 4:57 AM, ruslan usifov <ruslan.usi...@gmail.com> >> wrote: >>> 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 >> >> >> >> -- >> Jonathan Ellis >> Project Chair, Apache Cassandra >> co-founder of DataStax, the source for professional Cassandra support >> http://www.datastax.com
