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https://issues.apache.org/jira/browse/BOOKKEEPER-220?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13413839#comment-13413839
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Matteo Merli commented on BOOKKEEPER-220:
-----------------------------------------
Ivan, HBase was what we always though as the solution for the metadata updates.
The above was an idea to remove "the need" for Hbase (at least for the write
throughput part), by storing the updates directly in BK.
At the end of the day, even HBase has to log the cursor update as a new entry
in its journal and every once in a while it will perform the compaction. This
woud not be much different in BK, the cursor update is appended to the ledger
and after a while (let say 1M updates) we create a new ledger and delete the
old one.
> Managed Ledger proposal
> -----------------------
>
> Key: BOOKKEEPER-220
> URL: https://issues.apache.org/jira/browse/BOOKKEEPER-220
> Project: Bookkeeper
> Issue Type: New Feature
> Components: bookkeeper-client
> Reporter: Matteo Merli
> Assignee: Matteo Merli
> Fix For: 4.2.0
>
> Attachments: 0001-BOOKKEEPER-220-Managed-Ledger-proposal.patch,
> 0001-BOOKKEEPER-220-Managed-Ledger-proposal.patch,
> 0001-BOOKKEEPER-220-Managed-Ledger-proposal.patch
>
>
> The ManagedLedger design is based on our need to manage a set of ledgers,
> with a single writer (at any point in time) and a set on consumers that read
> entries from it.
> The ManagedLedger also takes care of periodically closing ledgers to have a
> "reasonable" sized sets of ledgers that can individually deleted when no more
> needed.
> I've put on github the interface proposal (along with an early WIP
> implementation)
> http://github.com/merlimat/managed-ledger
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