[jira] [Resolved] (CASSANDRA-3943) Too many small size sstables after loading data using sstableloader or BulkOutputFormat increases compaction time.

["Jonathan Ellis (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CASSANDRA-3943?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jonathan Ellis resolved CASSANDRA-3943.
---------------------------------------

       Resolution: Won't Fix
    Fix Version/s:     (was: 2.0)

Happy to see this picked up again but I think CASSANDRA-5371 addresses the low-hanging fruit here.
                
> Too many small size sstables after loading data using sstableloader or BulkOutputFormat increases compaction time.
> ------------------------------------------------------------------------------------------------------------------
>
>                 Key: CASSANDRA-3943
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-3943
>             Project: Cassandra
>          Issue Type: Wish
>          Components: Hadoop, Tools
>    Affects Versions: 0.8.2, 1.1.0
>            Reporter: Samarth Gahire
>            Priority: Minor
>              Labels: bulkloader, hadoop, sstableloader, streaming, tools
>   Original Estimate: 168h
>  Remaining Estimate: 168h
>
> When we create sstables using SimpleUnsortedWriter or BulkOutputFormat,the size of sstables created is around the buffer size provided.
> But After loading , sstables created in the cluster nodes are of size around
> {code}( (sstable_size_before_loading) * replication_factor ) / No_Of_Nodes_In_Cluster{code}
> As the no of nodes in cluster goes increasing, size of each sstable loaded to cassandra node decreases.Such small size sstables take too much time to compact (minor compaction) as compare to relatively large size sstables.
> One solution that we have tried is to increase the buffer size while generating sstables.But as we increase the buffer size ,time taken to generate sstables increases.Is there any solution to this in existing versions or are you fixing this in future version?

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