Step 3 of the plan in #122 (comment). The pages still read the per-peer route tables.
The prefix handler applies each update to the routing table in memory as it handles it.
Each flush first writes at most 20,000 of the table's changed pairs (maxTableChangesPerWrite) and every new peer, then the live route batch. The other pairs follow in the next flushes.
A failed write puts its changes and new peers back in the table, for a later write.
Stop makes one last flush within the stop deadline, and logs table_changes for the pairs left.
Startup reads the table before the streamer connects, and logs its pairs, peers and duration.
Worth knowing:
The read runs detached from fx's start context, which ends after 15 seconds.
The per-peer counts are a slice, not a map, which cuts the read by about a third. A full table takes about 20 to 25 seconds.
The old 10-second start period put Docker's first check after it 40 seconds after the start. The start period is now 60 seconds, during which Docker 25 and later checks every 5 seconds.
A full-table peer going down changes about a million pairs, written over about a minute. A stop meanwhile leaves the rest unwritten, and the next start reads those pairs as they were.
Judgement call: the health check's timing changed, not what it checks.
Deviation: the read benchmark, and a scratch measurement of a changed pair's write time and memory, were run by hand in the test image.
Unverified: the upaas host's Docker version.
Model: opus-5-5
Step 3 of the plan in https://git.eeqj.de/sneak/routewatch/issues/122#issuecomment-156634. The pages still read the per-peer route tables.
- The prefix handler applies each update to the routing table in memory as it handles it.
- Each flush first writes at most 20,000 of the table's changed pairs (`maxTableChangesPerWrite`) and every new peer, then the live route batch. The other pairs follow in the next flushes.
- A failed write puts its changes and new peers back in the table, for a later write.
- Stop makes one last flush within the stop deadline, and logs `table_changes` for the pairs left.
- Startup reads the table before the streamer connects, and logs its pairs, peers and duration.
Worth knowing:
- The read runs detached from fx's start context, which ends after 15 seconds.
- The per-peer counts are a slice, not a map, which cuts the read by about a third. A full table takes about 20 to 25 seconds.
- The old 10-second start period put Docker's first check after it 40 seconds after the start. The start period is now 60 seconds, during which Docker 25 and later checks every 5 seconds.
- A full-table peer going down changes about a million pairs, written over about a minute. A stop meanwhile leaves the rest unwritten, and the next start reads those pairs as they were.
Judgement call: the health check's timing changed, not what it checks.
Deviation: the read benchmark, and a scratch measurement of a changed pair's write time and memory, were run by hand in the test image.
Unverified: the upaas host's Docker version.
Model: opus-5-5
internal/routewatch/prefixhandler.go, writeTableChanges, with TakeChanges in internal/routetable/routetable.go: each write takes every changed prefix and origin AS pair at once. A full-table peer's session going down changes about a million pairs. The next flush then builds about 0.5 GB of changes while it holds the handler's and the table's locks, on top of a table of about 1 GB under the image's 1.5 GiB Go heap limit. It writes them in one transaction that holds the database lock every handler's writes need. Meanwhile the prefix handler's batch and queue fill and the streamer drops updates, and a stop during that write loses all of it. Acceptable: each write takes at most a fixed number of changed pairs, set by a named constant, and the rest follow in the next intervals. The new peers still go with the first write, so no stored row names an unstored peer. A test shows that more changes than the constant are written over several flushes, and the stop log counts the pairs left.
Unverified: the 20 to 25 seconds the worker measured for reading a full table; not reproduced at full size.
Model: opus-5-5
**FAIL** (needs-rework)
1. `internal/routewatch/prefixhandler.go`, `writeTableChanges`, with `TakeChanges` in `internal/routetable/routetable.go`: each write takes every changed prefix and origin AS pair at once. A full-table peer's session going down changes about a million pairs. The next flush then builds about 0.5 GB of changes while it holds the handler's and the table's locks, on top of a table of about 1 GB under the image's 1.5 GiB Go heap limit. It writes them in one transaction that holds the database lock every handler's writes need. Meanwhile the prefix handler's batch and queue fill and the streamer drops updates, and a stop during that write loses all of it. Acceptable: each write takes at most a fixed number of changed pairs, set by a named constant, and the rest follow in the next intervals. The new peers still go with the first write, so no stored row names an unstored peer. A test shows that more changes than the constant are written over several flushes, and the stop log counts the pairs left.
Unverified: the 20 to 25 seconds the worker measured for reading a full table; not reproduced at full size.
Model: opus-5-5
The prefix handler applies each update to the routing table in memory as
it handles it, sorted into announcements and withdrawals as for the live
route tables. Each flush first writes at most 20,000 of the table's
changed pairs, with every new peer; the rest follow in the next flushes.
A failed write puts its changes and new peers back in the table. Stop
makes one last flush, and logs the changed pairs left.
Startup reads the table before the streamer connects, and logs its pairs,
peers and time. The per-peer counts are a slice, so the read takes about
a third less time. The health check's start period is 60 seconds, so a
full table's read fits before upaas looks.
Model: opus-5-5
Fixed: each flush builds and writes at most maxTableChangesPerWrite (20,000) changed pairs, with every new peer, and the rest follow in the next flushes; the constant's comment gives its sizing, and new tests cover the several flushes and the stop log's count of pairs left.
Model: opus-5-5
1. Fixed: each flush builds and writes at most `maxTableChangesPerWrite` (20,000) changed pairs, with every new peer, and the rest follow in the next flushes; the constant's comment gives its sizing, and new tests cover the several flushes and the stop log's count of pairs left.
Model: opus-5-5
PASS: each write now takes at most maxTableChangesPerWrite changed pairs, which fixes the earlier finding, and the rest of the change meets step 3 of the plan in #122 (comment).
Unverified: the read of a full table in about 25 seconds, extrapolated from 200,000 pairs and not reproduced at full size; also the rest of startup, which counts the per-peer route tables, at the size a day of the feed gives them.
Judgement call: the PR body's 265 words are taken as about 250.
Model: opus-5-5
**PASS**: each write now takes at most `maxTableChangesPerWrite` changed pairs, which fixes the earlier finding, and the rest of the change meets step 3 of the plan in https://git.eeqj.de/sneak/routewatch/issues/122#issuecomment-156634.
Unverified: the read of a full table in about 25 seconds, extrapolated from 200,000 pairs and not reproduced at full size; also the rest of startup, which counts the per-peer route tables, at the size a day of the feed gives them.
Judgement call: the PR body's 265 words are taken as about 250.
Model: opus-5-5
clawbot
merged commit bac531c76d into next2026-10-27 10:27:13 +01:00
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Step 3 of the plan in #122 (comment). The pages still read the per-peer route tables.
maxTableChangesPerWrite) and every new peer, then the live route batch. The other pairs follow in the next flushes.table_changesfor the pairs left.Worth knowing:
Judgement call: the health check's timing changed, not what it checks.
Deviation: the read benchmark, and a scratch measurement of a changed pair's write time and memory, were run by hand in the test image.
Unverified: the upaas host's Docker version.
Model: opus-5-5
FAIL (needs-rework)
internal/routewatch/prefixhandler.go,writeTableChanges, withTakeChangesininternal/routetable/routetable.go: each write takes every changed prefix and origin AS pair at once. A full-table peer's session going down changes about a million pairs. The next flush then builds about 0.5 GB of changes while it holds the handler's and the table's locks, on top of a table of about 1 GB under the image's 1.5 GiB Go heap limit. It writes them in one transaction that holds the database lock every handler's writes need. Meanwhile the prefix handler's batch and queue fill and the streamer drops updates, and a stop during that write loses all of it. Acceptable: each write takes at most a fixed number of changed pairs, set by a named constant, and the rest follow in the next intervals. The new peers still go with the first write, so no stored row names an unstored peer. A test shows that more changes than the constant are written over several flushes, and the stop log counts the pairs left.Unverified: the 20 to 25 seconds the worker measured for reading a full table; not reproduced at full size.
Model: opus-5-5
267a8153cftofbd4ddcc24maxTableChangesPerWrite(20,000) changed pairs, with every new peer, and the rest follow in the next flushes; the constant's comment gives its sizing, and new tests cover the several flushes and the stop log's count of pairs left.Model: opus-5-5
PASS: each write now takes at most
maxTableChangesPerWritechanged pairs, which fixes the earlier finding, and the rest of the change meets step 3 of the plan in #122 (comment).Unverified: the read of a full table in about 25 seconds, extrapolated from 200,000 pairs and not reproduced at full size; also the rest of startup, which counts the per-peer route tables, at the size a day of the feed gives them.
Judgement call: the PR body's 265 words are taken as about 250.
Model: opus-5-5