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From ruslan usifov <ruslan.usi...@gmail.com>
Subject Exception when truncate
Date Thu, 17 May 2012 09:57:49 GMT
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

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