As part of the deep store by-passing <https://cwiki.apache.org/confluence/display/PINOT/By-passing+deep-store+requirement+for+Realtime+segment+completion> project, a server is allowed to download segments from peer Pinot servers during Low Level Consumer (LLC) instead of deep segment stores. To enable this feature, we plan to add a new URI format for the field *segment.realtime.download.url *in LLCRealtimeSegmentZKMetadata.
The new URI format serves the purpose of instructing a Pinot server to find and download the segment from a peer server. Controller writes it to Helix in case of segment upload failure or no deep store configured at all. We proposed the following format options and want to hear your feedback: 1. peer:///segmentName; (my preference) 2. simply an empty string *''* Both are in essence specially markers to indicate that the segment is not found in deep store and servers have to download them from peer servers. (1) has the benefit of better readability than (2) for debugging purposes. Please let me know what you think. Ting Chen
