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From ruslan usifov <ruslan.usi...@gmail.com>
Subject Re: Exception when truncate
Date Sun, 20 May 2012 17:09:53 GMT
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 <jbellis@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.usifov@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

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