[feature](cloud) Add lazy commit mechanism for commit_txn
#38243
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w41ter
reviewed
Jul 26, 2024
| } | ||
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| err = txn->commit(); | ||
| if (err != TxnErrorCode::TXN_OK) { |
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There may be conflicts caused by concurrent commits. According to our design expectations, TXN_CONFLICT also needs to be handled. One simple solution is to consider the data already converted if TXN_CONFLICT occurs (this requires that each task uses the same split batch method). Another solution is to retry once if TXN_CONFLICT occurs.
It's essential to manage the competition between transactions properly here.
w41ter
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Jul 26, 2024
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| DCHECK(txn_id > 0); | ||
| } | ||
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| void TxnLazyCommitTask::commit() { |
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warning: function 'commit' exceeds recommended size/complexity thresholds [readability-function-size]
void TxnLazyCommitTask::commit() {
^Additional context
cloud/src/meta-service/txn_lazy_committer.cpp:296: 139 lines including whitespace and comments (threshold 80)
void TxnLazyCommitTask::commit() {
^
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TPC-H: Total hot run time: 38261 ms |
TPC-DS: Total hot run time: 195283 ms |
ClickBench: Total hot run time: 31.9 s |
Motivation:
* In cloud mode we use `foundationdb` for storing rowset meta, when we load data with many rowsets,
`commit_txn` will failed because `foundationdb` currently limits all transactions to be below 10 MB in size,
So we spilt `commit_txn` into several sub fdb txn to solve the problem
How:
`commit_txn` flow like this
sub txn 1:
1. update partition `VersionPB` with txn_id
2. submit async task to txn_lazy_committer
txn_lazy_committer:
sub txn 2:
convert tmp rowset meta per batch
sub txn 3:
convert tmp rowset meta per batch
......
sub txn n:
make txn visible and remove txn_id in `VersionPB`
`get_version` main flow like this:
1. `VersionPB` without txn_id, the same as before
2. `VersionPB` has txn_id field, it means this is a txn
need be advanced by txn_lazy_committer, so submit a
`txn_lazy_task` to make last txn visible and retry
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TPC-H: Total hot run time: 38018 ms |
TPC-DS: Total hot run time: 192851 ms |
ClickBench: Total hot run time: 32.53 s |
gavinchou
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Aug 28, 2024
gavinchou
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w41ter
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Aug 29, 2024
w41ter
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PR approved by at least one committer and no changes requested. |
gavinchou
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Sep 10, 2024
Motivation:
* In cloud mode we use `foundationdb` for storing rowset meta, when we
load data with many rowsets, `commit_txn` will failed because
`foundationdb` currently limits all transactions to be below 10 MB in
size, So we spilt `commit_txn` into several sub fdb txn to solve the
problem
How:
Now `commit_txn` main flow like this
sub txn 1:
1. update partition `VersionPB` with txn_id
2. submit async task to txn_lazy_committer
txn_lazy_committer:
sub txn 2:
convert tmp rowset meta per batch
sub txn 3:
convert tmp rowset meta per batch
......
sub txn n:
make txn visible and remove txn_id in `VersionPB`
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Motivation:
foundationdbfor storing rowset meta, when we load data with many rowsets,commit_txnwill failed becausefoundationdbcurrently limits all transactions to be below 10 MB in size, So we spiltcommit_txninto several sub fdb txn to solve the problemHow:
Now
commit_txnmain flow like thissub txn 1:
VersionPBwith txn_idtxn_lazy_committer:
sub txn 2:
convert tmp rowset meta per batch
sub txn 3:
convert tmp rowset meta per batch
......
sub txn n:
make txn visible and remove txn_id in
VersionPB