RocksDB crashing when doing simple get about rocksdb

[adamretter]

If you want to explicitly use Column Families, you should pass the descriptors when you open the db, in return you will get back a set of handles that you can reuse for get/put.

Otherwise, if you don't want to explicitly use Column Families, you can just call -

byte[] value = db.get(KEY);

...

db.put(KEY, value);

[vsrivatsan89]

I thought that was the case, but I recall receiving exception saying that column family can’t be null when using the get (KEY) API. Let me try again.

[vsrivatsan89]

@adamretter I updated the code as per your suggestion to

try {
      byte[] value = db.get(KEY);
      if (value == null) {
        value = ByteBuffer.allocate(4).putInt(1).array();
      } else {
        value = ByteBuffer.allocate(4).putInt(ByteBuffer.wrap(value).getInt() + 1).array();
      }
      db.put(KEY, value);
      return "SUCCESS";
    } catch (RocksDBException e) {
      throw new RuntimeException(e);
    }

I still get SIGSEGV. If i'm not using column families explicitly in my API calls, do I still need to register the default column family upon DB open?

[adamretter]

@vsrivatsan89 I just took a closer look at your earlier code:

try (final Options options = new Options().setCreateIfMissing(true)) {
      try (final RocksDB db = RocksDB.open(options, "/mnt/test")) {
        log.info("Successfully loaded RocksDB");
        return db;
      } catch (RocksDBException e) {
        log.info("Exception in loading RocksDB");
        throw new RuntimeException(e);
      }
}

This is invalid! Your code will call db.close() and then options.close() before returning the db object.

[vsrivatsan89]

@adamretter Bah! Sorry about the silly mistake and wasting your time. Thank you for your patience.