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https://issues.apache.org/jira/browse/CASSANDRA-14203?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16347443#comment-16347443
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Jeremy Hanna commented on CASSANDRA-14203:
------------------------------------------

It looks from the error message that there just isn't enough available disk 
space to write the compacted sstable.  Is there something more to this?

> unable to run compactions in cassandra 3.9 version
> --------------------------------------------------
>
>                 Key: CASSANDRA-14203
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-14203
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Compaction
>            Reporter: chinta kiran
>            Priority: Major
>
> HI Team, We are unable to run compaction on this server.
> The space details are as follows:
>  
> WARN  [CompactionExecutor:8279] 2018-01-30 22:02:53,889 
> CompactionTask.java:91 - Insufficient space to compact all requested files 
> BigTableReader(path='/fs4/cassandra/data/asm_log/event_group-3b5782d08e4411e6842917253f111990/mc-78218-big-Data.db'),
>  
> BigTableReader(path='/fs3/cassandra/data/asm_log/event_group-3b5782d08e4411e6842917253f111990/mc-78217-big-Data.db')
> ERROR [CompactionExecutor:8279] 2018-01-30 22:02:53,890 
> CassandraDaemon.java:226 - Exception in thread 
> Thread[CompactionExecutor:8279,1,main]
> java.lang.RuntimeException: Not enough space for compaction, estimated 
> sstables = 1, expected write size = 92227100392
>         at 
> org.apache.cassandra.db.compaction.CompactionTask.checkAvailableDiskSpace(CompactionTask.java:310)
>  ~[apache-cassandra-3.9.jar:3.9]
>         at 
> org.apache.cassandra.db.compaction.CompactionTask.runMayThrow(CompactionTask.java:126)
>  ~[apache-cassandra-3.9.jar:3.9]
>         at 
> org.apache.cassandra.utils.WrappedRunnable.run(WrappedRunnable.java:28) 
> ~[apache-cassandra-3.9.jar:3.9]
>         at 
> org.apache.cassandra.db.compaction.CompactionTask.executeInternal(CompactionTask.java:82)
>  ~[apache-cassandra-3.9.jar:3.9]
>         at 
> org.apache.cassandra.db.compaction.AbstractCompactionTask.execute(AbstractCompactionTask.java:60)
>  ~[apache-cassandra-3.9.jar:3.9]
>         at 
> org.apache.cassandra.db.compaction.CompactionManager$BackgroundCompactionCandidate.run(CompactionManager.java:264)
>  ~[apache-cassandra-3.9.jar:3.9]
>         at 
> java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) 
> ~[na:1.8.0_152]
>         at java.util.concurrent.FutureTask.run(FutureTask.java:266) 
> ~[na:1.8.0_152]
>         at 
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
>  ~[na:1.8.0_152]
>         at 
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
>  [na:1.8.0_152]
>         at java.lang.Thread.run(Thread.java:748) [na:1.8.0_152]



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