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37 lines
1.4 KiB
Markdown
37 lines
1.4 KiB
Markdown
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Overview
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**TimelineRanker** (TLR) is a legacy service which provides relevance-scored tweets from the Earlybird Search Index and User Tweet Entity Graph (UTEG) service. Despite its name, it no longer does any kind of heavy ranking/model based ranking itself - just uses relevance scores from the Search Index for ranked tweet endpoints.
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The following is a list of major services that Timeline Ranker interacts with:
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**Earlybird-root-superroot (a.k.a Search)**
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Timeline Ranker calls the Search Index's super root to fetch a list of Tweets.
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**User Tweet Entity Graph (UTEG)**
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Timeline Ranker calls UTEG to fetch a list of tweets liked by the users you follow.
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**Socialgraph**
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Timeline Ranker calls Social Graph Service to obtain follow graph and user states such as blocked, muted, retweets muted, etc.
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**TweetyPie**
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Timeline Ranker hydrates tweets by calling TweetyPie so that it can post-filter tweets based on certain hydrated fields.
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**Manhattan**
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Timeline Ranker hydrates some tweet features (eg, user languages) from Manhattan.
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**Home Mixer**
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Home Mixer calls Timeline Ranker to fetch tweets from the Earlybird Search Index and User Tweet Entity Graph (UTEG) service to power both the For You and Following Home Timelines.
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Timeline Ranker does light ranking based on Earlybird tweet candidate scores and truncates to the number of candidates requested by Home Mixer based on these scores
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