Add byte level details to list progress command #503
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hanefi
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This patch allows reporting the total number of bytes transferred during
a copy operation. However, it has a limitation that the reported value
is only updated after each table is copied. This is because we do not
update table summary files while the copy is in progress.
Changes include:
- 3 new fields in table summary structures:
- network.bytes: total number of bytes transmitted
- network.bytes-pretty: pretty printed form of network.bytes
- network.transmit-rate: pretty printed bytes transmitted per second
- Some new fields on the `pgcopydb list progress --json --summary`
command:
- steps[].network is a new field that exists for COPY step and has
the following fields:
- bytes: total number of bytes transmitted for all tables
- bytes-pretty: pretty printed form of bytes
- tables[].network is a new json value with the following fields:
- bytes: total number of bytes transmitted for table
- bytes-pretty: pretty printed form of bytes
- transmit-rate: pretty printed bytes transmitted per second
- A new column on top level summary that shows total number of bytes
copied.
hanefi
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hanefi
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Nov 14, 2023
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| char bytesPretty[BUFSIZE] = { 0 }; | ||
| pretty_print_bytes(bytesPretty, BUFSIZE, summary->bytesTransmitted); | ||
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| char transmitRate[BUFSIZE] = { 0 }; | ||
| pretty_print_bytes_per_second(transmitRate, BUFSIZE, summary->bytesTransmitted, | ||
| summary->durationMs); | ||
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I did not want to store bytesPretty and transmitRate in CopyTableSummary structs.
- It is inexpensive to have an integer addition in our copy loop, unlike pretty printing said value. I did not want to store bytes and bytesPretty when I can only update the primitive type and not keep the other in sync.
- Calculating the transmitRate in real time is also an expensive operation similar to bytesPretty that was discussed in earlier item. Also, I needed to have the duration information that is not always there when the command is running.
- If resuming an earlier operation, reading an integer value for bytes from disk makes sense. All the other values can be generated from bytes and duration information.
docs/ref/pgcopydb_clone.rst
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| Step Connection Duration Transfer Concurrency | ||
| -------------------------------------------------- ---------- ---------- ---------- ------------ | ||
| Dump Schema source 225ms 1 | ||
| Catalog Queries (table ordering, filtering, etc) source 842ms 1 | ||
| Prepare Schema target 694ms 1 | ||
| COPY, INDEX, CONSTRAINTS, VACUUM (wall clock) both 1s538 8 + 12 | ||
| COPY (cumulative) both 2s771 2955 kB 8 | ||
| Large Objects (cumulative) both 242ms 1 | ||
| CREATE INDEX, CONSTRAINTS (cumulative) target 3s489 12 | ||
| Finalize Schema target 654ms 1 | ||
| -------------------------------------------------- ---------- ---------- ---------- ------------ | ||
| Total Wall Clock Duration both 3s984 8 + 12 | ||
| -------------------------------------------------- ---------- ---------- ---------- ------------ |
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Note: In this patch, most of the data in the top-level duration tables are made up.
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All the numbers in the docs to this point where obtained by actual runs and copy/pasted. When that make sense, runs from the test suite, ensuring they're easy to replicate, and that we're in the right ballpark. Please consider the same approach here.
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I created a local prototype that can produce reproducible documentation examples. I used a copy of pagila tests as a starting point and I copied commands from our current documentation. Finally I copy pasted command outputs to the docs.
Hopefully, I will open a separate PR with my changes for reproducible documentation example generation after polishing it some more.
dimitri
requested changes
Nov 20, 2023
docs/ref/pgcopydb_clone.rst
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| Step Connection Duration Transfer Concurrency | ||
| -------------------------------------------------- ---------- ---------- ---------- ------------ | ||
| Dump Schema source 225ms 1 | ||
| Catalog Queries (table ordering, filtering, etc) source 842ms 1 | ||
| Prepare Schema target 694ms 1 | ||
| COPY, INDEX, CONSTRAINTS, VACUUM (wall clock) both 1s538 8 + 12 | ||
| COPY (cumulative) both 2s771 2955 kB 8 | ||
| Large Objects (cumulative) both 242ms 1 | ||
| CREATE INDEX, CONSTRAINTS (cumulative) target 3s489 12 | ||
| Finalize Schema target 654ms 1 | ||
| -------------------------------------------------- ---------- ---------- ---------- ------------ | ||
| Total Wall Clock Duration both 3s984 8 + 12 | ||
| -------------------------------------------------- ---------- ---------- ---------- ------------ |
There was a problem hiding this comment.
All the numbers in the docs to this point where obtained by actual runs and copy/pasted. When that make sense, runs from the test suite, ensuring they're easy to replicate, and that we're in the right ballpark. Please consider the same approach here.
This commit addresses 2 issues raised in the review: 1. Using a SI standards when reporting data-rate units 2. Updating the relevant documentation with reproducible examples The documentation update is done in a way that allowed me to run the commands in a docker environment. Once I polish my changes in this docker environment, I will update all the documentation with it and share it in a separate PR.
dimitri
approved these changes
Nov 22, 2023
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This patch allows reporting the total number of bytes transferred during
a copy operation. However, it has a limitation that the reported value
is only updated after each table is copied. This is because we do not
update table summary files while the copy is in progress.
Changes include:
pgcopydb list progress --json --summarycommand:
the following fields:
copied.