Rocksdb: Request to add TransactionDB and OptimisticTransactionDB to rockdbjni

[Kangmo]

Hi,

I am assuming that these two classes are missing in rocksdbjni.
It would be great if I can achieve atomicity of my transaction using either TransactionDB or OptimisticTransactionDB.

I request to add these two classes to rocksdbjni.
It would be great if you have any planned release day for the new rocksdbjni with these (or one of these) classes.

RocksDB rocks!!

[adamretter]

Hi @Kangmo I am already working on this and hope to have something in the next week or two.

[Kangmo]

Thanks Adam, that is great news!

2016년 6월 4일 토요일, Adam [email protected]님이 작성한 메시지:

Hi @Kangmo https://github.com/Kangmo I am already working on this and
hope to have something in the next week or two.

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[Kangmo]

Hi Adam, is there a branch that I can test the two classes before the release? It would be great if there is any to try out these classes.

Thanks for providing two classes in advance.

[wicknicks]

Hi @adamretter, any progress on this feature? Would love to test it out on a project I am working on. Thanks very much.

[Kangmo]

Hi @adamretter, I also would love to test it out, and waiting for this feature to keep RocksDB data consistent in my project, ScaleChain.
Thanks in advance for your effort on this issue, again.

[adamretter]

I am working on it. It's just taking a while I am afraid.

The WIP is visible here https://github.com/adamretter/rocksdb/tree/java-transactions

[Kangmo]

Hi @adamretter, thanks for the update.

I have some questions on the transaction feature.
Just out of curiosity, does a transaction keep locks on keys?
(Sorry I did not investigate the underlying C++ implementation)

Example>
(1) Transaction A updates key1
(2) Transaction B updates key1 before Transaction A ends

Does transaction B wait for the lock on key1 held by Transaction A?
Does it support deadlock detection?
Does it support range rocks, or different kinds of isolation levels?
Are all four ACID properties supported?

[adamretter]

Duplicate of https://github.com/facebook/rocksdb/issues/697

[adamretter]

@Kangmo You are best to look at the Transaction Samples: https://github.com/adamretter/rocksdb/tree/java-transactions/java/samples/src/main/java

[gfosco]

Closing this via automation due to lack of activity. If discussion is still needed here, please re-open or create a new/updated issue.