My Cassandra cluster has plenty of free space, for now only about 30% of
space are used
On Sun, May 4, 2014 at 6:36 AM, Yatong Zhang <bluefl...@gmail.com> wrote:
> Hi there,
>
> It was strange that the 'xxx-tmp-xxx.db' file kept increasing until
> Cassandra throw exceptions with 'No space left on device'. I am using CQL 3
> to create a table to store data about 200K ~ 500K per record. I have 6
> harddisks per node and cassandra was configured with 6 data
> directories(ext4 file systems, Centos 6.5):
>
> data_file_directories:
>> - /data1/cass
>> - /data2/cass
>> - /data3/cass
>> - /data4/cass
>> - /data5/cass
>> - /data6/cass
>>
>
> And every directory is on a standalone disk. But I just found when the
> error occurred:
>
> [root@node5 images]# ll -hl
>> total 3.6T
>> drwxr-xr-x 4 root root 4.0K Jan 20 09:44 snapshots
>> -rw-r--r-- 1 root root 456M Apr 30 13:42
>> mydb-images-tmp-jb-91068-CompressionInfo.db
>> -rw-r--r-- 1 root root 3.5T Apr 30 13:42 mydb-images-tmp-jb-91068-Data.db
>> -rw-r--r-- 1 root root 0 Apr 30 13:42
>> mydb-images-tmp-jb-91068-Filter.db
>> -rw-r--r-- 1 root root 2.0G Apr 30 13:42 mydb-images-tmp-jb-91068-Index.db
>>
>
> [root@node5 images]# df -hl
> Filesystem Size Used Avail Use% Mounted on
> /dev/sda1 49G 7.5G 39G 17% /
> tmpfs 7.8G 0 7.8G 0% /dev/shm
> /dev/sda3 3.6T 1.3T 2.1T 38% /data1
> /dev/sdb1 3.6T 1.4T 2.1T 39% /data2
> /dev/sdc1 3.6T 466G 3.0T 14% /data3
> /dev/sdd1 3.6T 1.3T 2.2T 38% /data4
> /dev/sde1 3.6T 1.3T 2.2T 38% /data5
> /dev/sdf1 3.6T 3.6T 0 100% /data6
>
> *mydb-images-tmp-jb-91068-Data.db *almost occupied all the disk space (4T
> harddisk with 3.6T actual usable size) and the error looks like:
>
> INFO [FlushWriter:4174] 2014-05-04 05:15:15,744 Memtable.java (line 403)
>> Completed flushing
>> /data3/cass/system/compactions_in_progress/system-compactions_in_progress-jb-16942-Data.db
>> (42 bytes) for commitlog position ReplayPosition(segmentId=1398900356204,
>> position=25024609)
>> INFO [CompactionExecutor:3689] 2014-05-04 05:15:15,745
>> CompactionTask.java (line 115) Compacting
>> [SSTableReader(path='/data3/cass/system/compactions_in_progress/system-compactions_in_progress-jb-16940-Data.db'),
>> SSTableReader(path='/data3/cass/system/compactions_in_progress/system-compactions_in_progress-jb-16942-Data.db'),
>> SSTableReader(path='/data3/cass/system/compactions_in_progress/system-compactions_in_progress-jb-16941-Data.db'),
>> SSTableReader(path='/data3/cass/system/compactions_in_progress/system-compactions_in_progress-jb-16939-Data.db')]
>> ERROR [CompactionExecutor:1245] 2014-05-04 05:15:15,745
>> CassandraDaemon.java (line 198) Exception in thread
>> Thread[CompactionExecutor:1245,1,main]
>> FSWriteError in /data2/cass/mydb/images/mydb-images-tmp-jb-92181-Filter.db
>> at
>> org.apache.cassandra.io.sstable.SSTableWriter$IndexWriter.close(SSTableWriter.java:475)
>> at
>> org.apache.cassandra.io.util.FileUtils.closeQuietly(FileUtils.java:212)
>> at
>> org.apache.cassandra.io.sstable.SSTableWriter.abort(SSTableWriter.java:301)
>> at
>> org.apache.cassandra.db.compaction.CompactionTask.runWith(CompactionTask.java:209)
>> at
>> org.apache.cassandra.io.util.DiskAwareRunnable.runMayThrow(DiskAwareRunnable.java:48)
>> at
>> org.apache.cassandra.utils.WrappedRunnable.run(WrappedRunnable.java:28)
>> at
>> org.apache.cassandra.db.compaction.CompactionTask.executeInternal(CompactionTask.java:60)
>> at
>> org.apache.cassandra.db.compaction.AbstractCompactionTask.execute(AbstractCompactionTask.java:59)
>> at
>> org.apache.cassandra.db.compaction.CompactionManager$BackgroundCompactionTask.run(CompactionManager.java:197)
>> at
>> java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
>> at java.util.concurrent.FutureTask.run(FutureTask.java:262)
>> at
>> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
>> at
>> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
>> at java.lang.Thread.run(Thread.java:744)
>> Caused by: java.io.IOException: No space left on device
>> at java.io.FileOutputStream.write(Native Method)
>> at java.io.FileOutputStream.write(FileOutputStream.java:295)
>> at java.io.DataOutputStream.writeInt(DataOutputStream.java:197)
>> at
>> org.apache.cassandra.utils.BloomFilterSerializer.serialize(BloomFilterSerializer.java:34)
>> at
>> org.apache.cassandra.utils.Murmur3BloomFilter$Murmur3BloomFilterSerializer.serialize(Murmur3BloomFilter.java:44)
>> at
>> org.apache.cassandra.utils.FilterFactory.serialize(FilterFactory.java:41)
>> at
>> org.apache.cassandra.io.sstable.SSTableWriter$IndexWriter.close(SSTableWriter.java:468)
>> ... 13 more
>> ERROR [CompactionExecutor:1245] 2014-05-04 05:15:15,800
>> StorageService.java (line 367) Stopping gossiper
>> WARN [CompactionExecutor:1245] 2014-05-04 05:15:15,800
>> StorageService.java (line 281) Stopping gossip by operator request
>> INFO [CompactionExecutor:1245] 2014-05-04 05:15:15,800 Gossiper.java
>> (line 1271) Announcing shutdown
>>
>
>
> I have changed my table to "LeveledCompactionStrategy" to reduce the disk
> size needed when compaction, with:
>
> ALTER TABLE images WITH compaction = { 'class' :
>> 'LeveledCompactionStrategy', 'sstable_size_in_mb' : '192' };
>>
>
> But the problem still exists: the file keep increasing, and after about 2
> or 3 days cassandra will fail due to 'No space left on device' error. If I
> restart the node or using 'cleanup', it will resume to normal.
>
> I don't know is it because my configuration or it's just a bug, so would
> any one please help to solve this issue?
>
> Thanks
>
