| commit | 19e89c86f00a84a4e1504c6374398a43d707930a | [log] [tgz] |
|---|---|---|
| author | Edwin Kempin <ekempin@google.com> | Wed Oct 11 12:00:51 2017 +0200 |
| committer | Edwin Kempin <ekempin@google.com> | Wed Oct 11 15:51:43 2017 +0200 |
| tree | faebb4067625bda81f3e182cd5f680b396a3f896 | |
| parent | 203e958273fd7c3bb20cfe70e19dcb7f8f0bce9e [diff] |
Add extension point to allow custom merge super set computations At Google we have performance issues with the Submitted Together REST endpoint when topics span hundreds of projects. This extension point allows us to distribute the load to compute the merge super set across multiple server nodes and thus enhance the performance of the Submitted Together REST endpoint. In the multi-master setup at Google the load balancer distributes requests to different nodes based on the project in the URL. This means not all nodes have to load all repositories into cache which improves performance a lot. However we still have performance problems with the Submitted Together REST endpoint and for large topics which span several hundreds of projects loading the list of changes that should be submitted together can take several minutes. The problem is that the request to the Submitted Together REST endpoint is not specific to one project, but to include the predecessor change we have to open the repository for all projects that are touched in the topics. This means the one node node that handles the request has to open several hundreds of repositories which is slow and also polutes the repository caches. To fix this we want to implement the new extension point in such a way that it distributes the load over multiple nodes that each have the necessary repositories already cached. These nodes can do the computation in parallel which should speed up the operation further. Change-Id: I814498a7526cd5d818efed6cc000c03fc9bc5a09 Signed-off-by: Edwin Kempin <ekempin@google.com>
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