I am using this line to get entries from my Cassandra database
val data1 =
ssc.
cassandraTable("orbigo2", "my_trips").
select("trip_id").
where ("user_id=?", uid)
But this is taking a lot of time, I guess the reason is that my uid is not a primary key but an index key.
Is there any way in which I can speed this up?
答案 0 :(得分：0)
我只建议更改数据模型，以使<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<select id="country_code" name="country_code">
<option value="" disabled selected>Choose a Country Code</option>
<option data-country="Netherlands" value="NL">NL</option>
<option data-country="Germany" value="DE">DE</option>
</select>
<!-- Country input -->
<label for="country">Country</label>
<input id="country" class="" type="text" value="" name="country">
<!-- Button -->
<button type="submit">Start Ticket</button>成为分区键-在这种情况下，它将变得更快...现在，它只是扫描整个表并提取必要的数据。 / p>
此外，您可能会考虑使用DataFrames而不是RDD-它具有更多的优化功能，也许您可以使用二级索引。您可以使用DataFrame上的uid检查执行计划，以了解如何访问数据...