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https://issues.apache.org/jira/browse/CASSANDRA-7145?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14086556#comment-14086556
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Maxim Zakharenkov commented on CASSANDRA-7145:
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Today I had same problem on my local machine with one cassandra node, default 
configuration (2.0.8 and 2.0.9 versions). It was quite easily repeatable. I 
just execute quite heavy benchmark which writes new data as fast as it can into 
a single table. When it is running, execute "nodetool compact" for that table. 
After some 2 or 3 attempts normally you will get the issue.

> FileNotFoundException during compaction
> ---------------------------------------
>
>                 Key: CASSANDRA-7145
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-7145
>             Project: Cassandra
>          Issue Type: Bug
>         Environment: CentOS 6.3, Datastax Enterprise 4.0.1 (Cassandra 2.0.5), 
> Java 1.7.0_55
>            Reporter: PJ
>         Attachments: compaction - FileNotFoundException.txt, repair - 
> RuntimeException.txt, startup - AssertionError.txt
>
>
> I can't finish any compaction because my nodes always throw a 
> "FileNotFoundException". I've already tried the following but nothing helped:
> 1. nodetool flush
> 2. nodetool repair (ends with RuntimeException; see attachment)
> 3. node restart (via dse cassandra-stop)
> Whenever I restart the nodes, another type of exception is logged (see 
> attachment) somewhere near the end of startup process. This particular 
> exception doesn't seem to be critical because the nodes still manage to 
> finish the startup and become online.
> I don't have specific steps to reproduce the problem that I'm experiencing 
> with compaction and repair. I'm in the middle of migrating 4.8 billion rows 
> from MySQL via SSTableLoader. 
> Some things that may or may not be relevant:
> 1. I didn't drop and recreate the keyspace (so probably not related to 
> CASSANDRA-4857)
> 2. I do the bulk-loading in batches of 1 to 20 millions rows. When a batch 
> reaches 100% total progress (i.e. starts to build secondary index), I kill 
> the sstableloader process and cancel the index build
> 3. I restart the nodes occasionally. It's possible that there is an on-going 
> compaction during one of those restarts.
> Related StackOverflow question (mine): 
> http://stackoverflow.com/questions/23435847/filenotfoundexception-during-compaction



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