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From DuyHai Doan <doanduy...@gmail.com>
Subject Re: Cassandra 2.0.7 keeps reporting errors due to no space left on device
Date Sun, 04 May 2014 06:37:15 GMT
Hello Yatong

"If I restart the node or using 'cleanup', it will resume to normal." -->
what does df -hl shows for /data6 when you restart or cleanup the node ?

By the way, a single SSTable of 3.6Tb is kind of huge. Do you perform
manual repair frequently ?





On Sun, May 4, 2014 at 1:51 AM, Yatong Zhang <blueflycn@gmail.com> wrote:

> 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 <blueflycn@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
>>
>
>

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