Matteo Merli created BOOKKEEPER-1068:
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Summary: Expose ByteBuf in LedgerEntry to avoid data copy
Key: BOOKKEEPER-1068
URL: https://issues.apache.org/jira/browse/BOOKKEEPER-1068
Project: Bookkeeper
Issue Type: Improvement
Reporter: Matteo Merli
Assignee: Matteo Merli
Fix For: 4.5.0
To avoid copying the entries payloads when writing/reading on a ledger and
having to allocate a lot of byte[] on the JVM heap, we need to accept Netty
ByteBuf buffer.
By passing a ByteBuf, an application can use a pooled buffer, pointing to
direct memory, to the {{LedgerHandle.addEntry()}} and have the same buffer
forwarded on the connection sockets to the bookies.
The same thing on the read side, {{LedgerEntry}} exposes an additional
{{getEntryBuffer()}} method that can be used to get the underlying buffer and
possibly forward that to some other connection, with zero-copy behavior
(excluding getting data in-out of the kernel).
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