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| ajayaa | Hi dukhlov, Do we have support for global secondary index in magnetodb? | 11:38 |
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| *** isviridov_away is now known as isviridov | 11:42 | |
| isviridov | Hello ajayaa. We don't and it is not planned to add yet. | 11:43 |
| dukhlov | Hi, ajayaa | 13:16 |
| ajayaa | Hi dukhlov | 13:16 |
| dukhlov | Cassandra has task in jira to add support for global secondary indexes in version 3 | 13:17 |
| dukhlov | we have to options: wait for it's native support | 13:17 |
| dukhlov | or implement it on magnetodb layer | 13:18 |
| ajayaa | I get it. | 13:18 |
| ajayaa | waiting for native is better I guess. | 13:18 |
| dukhlov | sure | 13:18 |
| ajayaa | apart from it and provisioned_output, is there anything else (from top of your mind) which is not supported in mdb? | 13:19 |
| dukhlov | at least we have no request to implement it right now | 13:19 |
| ajayaa | and which is there in dynamodb. | 13:20 |
| dukhlov | we support limited expected conditions (only NULL, NOT_NULL and EQUALS) | 13:21 |
| dukhlov | Also we have implemented some parts of DynamoDB API not optimal | 13:22 |
| dukhlov | because cassandra doesn't have such native functionality | 13:22 |
| dukhlov | it is UpdateItem requests | 13:22 |
| dukhlov | inserts to tables with LSI defined | 13:23 |
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| dukhlov | also DynamoDB Query request returns consumed capacity - we don't | 13:26 |
| ajayaa | dukhlov, we are not dealing with any kind of capacity as of now, I believe. | 13:26 |
| dukhlov | yes | 13:26 |
| dukhlov | "ReturnValues" of PutItem and UpdateItem requests has limited functionality | 13:29 |
| ajayaa | How different is local secondary index in dynamodb and secondary index in cassandra? | 13:30 |
| ajayaa | secondary indices in cassandra are also local. | 13:30 |
| ajayaa | to each node* | 13:31 |
| ajayaa | I thought both of them provide the same functionality. | 13:34 |
| rushiagr | ajayaa: isviridov: are all of these limitations written down in a list somewhere, or filed as bugs? | 13:51 |
| rushiagr | dukhlov: ^ | 13:51 |
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| dukhlov | Hi, rushiagr | 14:39 |
| rushiagr | dukhlov: hi | 14:39 |
| dukhlov | ajayaa, cassandra LSI are designed for another usecases | 14:40 |
| dukhlov | if you make some field indexed, cassandra creates internal table where your indexed field is hash key | 14:41 |
| dukhlov | and then you can make queries where indexed_field == some value | 14:42 |
| dukhlov | but DynamoDB LSI should be stored in internal table with the same hash key, but alternative range key | 14:43 |
| dukhlov | and you need to have ability to query data by hash_key==value AND indexed_field == (>, >=,<, <=) value | 14:44 |
| dukhlov | my investigations shows that we could use native cassandra support for LSI, but for this we need custom index implementation | 14:45 |
| dukhlov | https://review.openstack.org/#/c/107500/ | 14:45 |
| dukhlov | you can find here PoC of such implementation | 14:45 |
| dukhlov | but for now we have LSI implemented on MagnetoDB leyer manually | 14:46 |
| rushiagr | dukhlov: thanks for the information | 14:47 |
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