Enrico Olivelli commented on BOOKKEEPER-1041:

 But this is very inefficient for HDDs

did you mean SSD ? 

> Multiple active entrylogs
> -------------------------
>                 Key: BOOKKEEPER-1041
>                 URL: https://issues.apache.org/jira/browse/BOOKKEEPER-1041
>             Project: Bookkeeper
>          Issue Type: Improvement
>          Components: bookkeeper-server
>            Reporter: Venkateswararao Jujjuri (JV)
>            Assignee: Charan Reddy Guttapalem
> Current bookkeeper is tuned for rotational HDDs. It has one active entrylog, 
> and all the ledger/entries go to the same entrylog until it is rotated out. 
> This is perfect for HDDs as seeks and moving head allover the disk platter is 
> very expensive. But this is very inefficient for HDDs, as each HDD can handle 
> multiple parallel writers, also this method is extremely inefficient for 
> compaction as it causes write amplification and inefficient disk space usage.
> Our proposal is to have multiple active entrylogs and a configuration param 
> on how many parallel entrylogs the system can have. This way one can have 
> ability to configure to have less (may be  one) ledger per entrylog.

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