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Cherrypick recent changes to gossip RFC

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Delete the RFC since this is all implemented.

See: 02bfcd23a9
This commit is contained in:
Greg Fitzgerald
2018-12-12 11:01:54 -07:00
parent c83538a60c
commit 90a0237457
2 changed files with 18 additions and 88 deletions
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book/src/gossip.md
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@@ -37,14 +37,12 @@ Upon receiving a push message, a node examines the message for:
1. Duplication: if the message has been seen before, the node responds with
`PushMessagePrune` and drops the message
2. New information: if the message is new the node
a. Stores the new information and updates its version
b. Stores the message in `pushed_once` (used for detecting duplicates,
purged after `PUSH_MSG_TIMEOUT * 5` ms)
c. Retransmits the messages to its own push peers
2. New data: if the message is new to the node
* Stores the new information with an updated version in its cluster info and
purges any previous older value
* Stores the message in `pushed_once` (used for detecting duplicates,
purged after `PUSH_MSG_TIMEOUT * 5` ms)
* Retransmits the messages to its own push peers
3. Expiration: nodes drop push messages that are older than `PUSH_MSG_TIMEOUT`
@@ -66,6 +64,16 @@ that represents things it already has. A node receiving a pull message
iterates over its values and constructs a pull response of things that miss the
filter and would fit in a message.
A node constructs the pull Bloom filter by iterating over the values it
currently has.
A node constructs the pull Bloom filter by iterating over current values and
recently purged values.
A node handles items in a pull response the same way it handles new data in a
push message.
## Purging
Nodes retain prior versions of values (those updated by a pull or push) and
expired values (those older than `GOSSIP_PULL_CRDS_TIMEOUT_MS`) in
`purged_values` (things I recently had). Nodes purge `purged_values` that are
older than `5 * GOSSIP_PULL_CRDS_TIMEOUT_MS`.