[GitHub] merlimat opened a new pull request #826: DbLedgerStorage implementation

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merlimat opened a new pull request #826: DbLedgerStorage implementation
URL: https://github.com/apache/bookkeeper/pull/826
 
 
   Porting multiple squashed commits from Yahoo branch. 
   
   This change adds a new `LedgerStorage` implementation that uses RocksDB to store the indexes for (ledgerId, entryId) to the data that is still kept in the entry logs.
   
   In addition, there are also a `WriteCache` and a `ReadCache` that are used to completely decouple the read & write paths.
   
   Note: This still has some methods that are not implemented. They are around the features added in 4.5 release: 
   
   ```java
   public long getLastAddConfirmed(long ledgerId) throws IOException;
   public Observable waitForLastAddConfirmedUpdate(long ledgerId, long previoisLAC, Observer observer) throws IOException;
   public void setExplicitlac(long ledgerId, ByteBuf lac) throws IOException;
   public ByteBuf getExplicitLac(long ledgerId);
   ```
   
   These will be implemented in a subsequent commit.

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