Update ClusterData2019.md

Tweaked and clarified description.

ClusterData2019.md

@@ -8,17 +8,17 @@ The `clusterdata-2019` trace dataset provides information about eight different
  * information about alloc sets (shared resource reservations used by jobs);
  * job-parent information for master/worker relationships such as MapReduce jobs.
 
-Just like the [version 2](ClusterData2011_2.md) trace, these new traces focus on resource requests and usage, and contain no information about end users, their data, or access patterns to storage systems and other services. 
+The 2019 traces focus on resource requests and usage, and contain no information about end users, their data, or access patterns to storage systems and other services.
 
-In addition to providing a downloadable format, we are also making the trace data available via Google BigQuery so that sophisticated analyses can be performed without requiring local resources. 
+Because of it's size (about 2.4TiB compressed), we are only making the trace data available via [Google BigQuery](https://cloud.google.com/bigquery) so that sophisticated analyses can be performed without requiring local resources. 
+
+**The `clusterdata-2019` traces are described in this document:
+[Google cluster-usage traces v3](https://drive.google.com/file/d/10r6cnJ5cJ89fPWCgj7j4LtLBqYN9RiI9/view).**  You can find the download and access instructions there, as well as many more details about what is in the traces, and how to interpret them. For additional background information, please refer to the 2015 Borg paper, [Large-scale cluster management at Google with Borg](https://ai.google/research/pubs/pub43438). 
 
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-
-**The `clusterdata-2019` traces are described in this document:
-[Google cluster-usage traces v3](https://drive.google.com/file/d/10r6cnJ5cJ89fPWCgj7j4LtLBqYN9RiI9/view).**  You can find the download and access instructions there, as well as many more details about what is in the traces, and how to interpret them. For additional background information, please refer to the 2015 Borg paper, [Large-scale cluster management at Google with Borg](https://ai.google/research/pubs/pub43438). 
 
 ![Creative Commons CC-BY license](https://i.creativecommons.org/l/by/4.0/88x31.png)
 The data and trace documentation are made available under the