Opening LevelDB with corrupted MANIFEST-0* file about rocksdb

[alanpaxton]

Is the manifest really corrupted, or are you just hitting a compatibility issue ? I am not sure how compatible RocksDB and LevelDB formats are; you could try opening using RocksJava with the oldest RocksDB format version

  public void openWithOldestFormatVersion() {
    final BlockBasedTableConfig blockBasedTableConfig =
        new BlockBasedTableConfig().setFormatVersion(0);

    try (final Options options = new Options().setTableFormatConfig(blockBasedTableConfig);
         final RocksDB ignored = RocksDB.openReadOnly(options, "<Your DB path here>")) {
    } catch (RocksDBException e) {
      // Access the DB
    }
  }

If you want to dig deeper see Docs

If the above doesn't work, you may be able to migrate your DB by opening it using LevelDB, iterating the keys and values, and writing to a new RocksDB database.

[dasasd122311]

Действительно ли манифест поврежден, или у вас просто возникла проблема совместимости? Я не уверен, насколько совместимы форматы RocksDB и LevelDB; вы можете попробовать открыть с помощью RocksJava самую старую версию формата RocksDB.

  public void openWithOldestFormatVersion() {
    final BlockBasedTableConfig blockBasedTableConfig =
        new BlockBasedTableConfig().setFormatVersion(0);

    try (final Options options = new Options().setTableFormatConfig(blockBasedTableConfig);
         final RocksDB ignored = RocksDB.openReadOnly(options, "<Your DB path here>")) {
    } catch (RocksDBException e) {
      // Access the DB
    }
  }

Если вы хотите копнуть глубже, см. Документы .

Если вышеперечисленное не сработает, вы можете перенести свою БД, открыв ее с помощью LevelDB, повторив ключи и значения и записав в новую базу данных RocksDB.

I think the problem is really due to LevelDB and RocksDB incompatibility, but setting it to the old database format didn't solve the problem. My LevelDB databases have been around since 2022

[alanpaxton]

It was worth a try. I agree, it is probably just basic divergence/incompatibility. I guess you will need to write copy code in C++, as there isn't a Java API for LevelDB. Unless someone has a better idea, are you happy to close this ticket ?

[dasasd122311]

Yeah, I'm closing the issue

[adamretter]

@dasasd122311 There was a Java port of LevelDB (I haven't checked if the storage format is the same) - might be helpful for you - https://github.com/dain/leveldb

[dasasd122311]

@dasasd122311 There was a Java port of LevelDB (I haven't checked if the storage format is the same) - might be helpful for you - https://github.com/dain/leveldb

I use its fork - https://github.com/halibobor/leveldb-java. Because the fork has been updated and has no problem reading ldb files. But the code is using org.iq80.snappy library. I got the error EXCEPTION_ACCESS_VIOLATION. I read that the owner of this library wrote that they switched to the new aircompressor library, but I don't know how I can rewrite the LevelDB library code, because some methods are used, some are removed and so on. I thought switching to RocksDB would solve my problem because it is updated frequently, but RocksDB is incompatible with my database.