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Questions tagged [rocksdb-java]

45 questions
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How can I configure all RocksDB instances of a Kafka streams application share the same config?

I have a Kafka streams application, where each instance handles ~30 partitions and has 1 state store (resulting in a total of 30 RocksDB instances). Assuming the application can scale in/out, the total number of RocksDB instances can change. I'd…
omer
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How to use Rocksdb merge in Java？

The documentation is not clear about how to use the merge operation while using rocksdb-jni, and I am not familiar with C++ API, how could I define an merge operator?
user9959339
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can I backing up rocksdb while putting?

I want to back up rocksdb while not blocking my writing calls, the status I expected is rocksdb should back up the data at that moment and ignoring the writing calls while backing up, is there a proper way to accomplish this? I tested this in java…
user9959339
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Is there a way to get Strong Consistency with RocksDb in Java?

I have a program which accesses a single RocksDB using multiple threads. Our workflow for a given document is to read the cache, do some work, then update the cache. My code uses chained CompletableFutures to process multiple documents in order (and…
Mark
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Optimal RocksDB configuration for use as secondary "cache"

I am looking at using RocksDB (from Java in my case) as a secondary "cache" behind a RAM based first level cache. I do not expect any items in RocksDB to be dramatically more commonly accessed than others (all the really frequently used items will…
Tristpost
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Rocks DB read instances not reflecting data from write instance

I have a rockDB write instance which writes data to "/rocksDB/data" . I have read instances which are also pointing to "/rocksDB/data" but they are unable to read data which is being written by write instance. If i restart the read instances , they…
jayanta layak
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Is there a way to retrieve `ColumnFamilyHandle` from `ColumnFamilyName` in RocksDb?

Alternatively, is there a way to get all the currently open ColumnFamilyHandles from a db? I am aware of the static function RocksDB.listColumnFamilies. But this returns a List List containing the column family names. Not sure if there is a…
ash_prakasan
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Sorting by key in rocksdb

I'm trying to compare in java a huge amount of data with 2 folders entry folder1 and folder2. Each folder contains several files of around 10 MBytes size each. I have about 100 files in each folder. Each file contains a key,value line something like…
cknelle
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RocksDb Java API support for Transactions

Does RocksJavaAPI have the support for transactions? I see that there is a Transaction DB class present in the JAR. I am not able to do a begin transaction on transaction Db class. RocksDB db = TransactionDB.open(options,…
jagannathan rajagopalan
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Kafka KeyValueStore - delete method is not working

I am trying to schedule a task in one of my Kafka processors to delete records from a local KeyValueStore (RocksDB). Even though no exception has appeared so far, none of the records are getting deleted. Here is my code: …
iliev951
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RocksDBException: does not exist

Exception: org.rocksdb.RocksDBException: /vdt/derived: does not exist (create_if_missing is false) at org.rocksdb.RocksDB.open(Native Method) at org.rocksdb.RocksDB.open(RocksDB.java:290) Files (.sst) are present at location…
amitwdh
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Kafka Streams API: Session Window exception

I am trying to create a Kafka topology and break it down into more readable. I have a stream that I group by keys, and then I am trying to window it like so: SessionWindowedKStream windowedTable = …
QuirkyBit
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Is there a retention policy for custom state store (RocksDb) with Kafka streams?

I am setting up a new Kafka streams application, and want to use custom state store using RocksDb. This is working fine for putting data in state store and getting a queryable state store from it and iterating over the data, However, after about 72…
Vibhor Mathur
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How do you write column data in rocksDB in java?

How do you write data in column format in rocksdb. Example of columns can be Id, state, URL, fieldNames, query; I should be able to read all data giving Id.
user3634446
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Will rocksDB support nested keys for one value?

I am new to RocksDB. I am testing it on java spring boot(dependency: org.rocksdb.rocksdbjni). Will it support on storing nested keys for one value and retrieve a value using nested keys. Example: In Java, I am using the following data structure.…
Praveen
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