when milvus process delete record, it need to find record's corresponded
segment by bloom filter, and higher bloom filter fp rate will cause
delete record forwards to wrong segments.
This PR Decrease bloom filter's default fp to 0.001.
Signed-off-by: Wei Liu <wei.liu@zilliz.com>
Signed-off-by: shaoting-huang [shaoting-huang@zilliz.com]
issue: https://github.com/milvus-io/milvus/issues/32982
# Background
Go 1.21 introduces several improvements and changes over Go 1.20, which
is quite stable now. According to
[Go 1.21 Release Notes](https://tip.golang.org/doc/go1.21), the big
difference of Go 1.21 is enabling Profile-Guided Optimization by
default, which can improve performance by around 2-14%. Here are the
summary steps of PGO:
1. Build Initial Binary (Without PGO)
2. Deploying the Production Environment
3. Run the program and collect Performance Analysis Data (CPU pprof)
4. Analyze the Collected Data and Select a Performance Profile for PGO
5. Place the Performance Analysis File in the Main Package Directory and
Name It default.pgo
6. go build Detects the default.pgo File and Enables PGO
7. Build and Release the Updated Binary (With PGO)
8. Iterate and Repeat the Above Steps
<img width="657" alt="Screenshot 2024-05-14 at 15 57 01"
src="https://github.com/milvus-io/milvus/assets/167743503/b08d4300-0be1-44dc-801f-ce681dabc581">
# What does this PR do
There are three experiments, search benchmark by Zilliz test platform,
search benchmark by open-source
[VectorDBBench](https://github.com/zilliztech/VectorDBBench?tab=readme-ov-file),
and search benchmark with PGO. We do both search benchmarks by Zilliz
test platform and by VectorDBBench to reduce reliance on a single
experimental result. Besides, we validate the performance enhancement
with PGO.
## Search Benchmark Report by Zilliz Test Platform
An upgrade to Go 1.21 was conducted on a Milvus Standalone server,
equipped with 16 CPUs and 64GB of memory. The search performance was
evaluated using a 1 million entry local dataset with an L2 metric type
in a 768-dimensional space. The system was tested for concurrent
searches with 50 concurrent tasks for 1 hour, each with a 20-second
interval. The reason for using one server rather than two servers to
compare is to guarantee the same data source and same segment state
after compaction.
Test Sequence:
1. Go 1.20 Initial Run: Insert data, build index, load index, and
search.
2. Go 1.20 Rebuild: Rebuild the index with the same dataset, load index,
and search.
3. Go 1.21 Load: Upload to Go 1.21 within the server. Then load the
index from the second run, and search.
4. Go 1.21 Rebuild: Rebuild the index with the same dataset, load index,
and search.
Search Metrics:
| Metric | Go 1.20 | Go 1.20 Rebuild Index | Go 1.21 | Go 1.21 Rebuild
Index |
|----------------------------|------------------|-----------------|------------------|-----------------|
| `search requests` | 10,942,683 | 16,131,726 | 16,200,887 | 16,331,052
|
| `search fails` | 0 | 0 | 0 | 0 |
| `search RT_avg` (ms) | 16.44 | 11.15 | 11.11 | 11.02 |
| `search RT_min` (ms) | 1.30 | 1.28 | 1.31 | 1.26 |
| `search RT_max` (ms) | 446.61 | 233.22 | 235.90 | 147.93 |
| `search TP50` (ms) | 11.74 | 10.46 | 10.43 | 10.35 |
| `search TP99` (ms) | 92.30 | 25.76 | 25.36 | 25.23 |
| `search RPS` | 3,039 | 4,481 | 4,500 | 4,536 |
### Key Findings
The benchmark tests reveal that the index build time with Go 1.20 at
340.39 ms and Go 1.21 at 337.60 ms demonstrated negligible performance
variance in index construction. However, Go 1.21 offers slightly better
performance in search operations compared to Go 1.20, with improvements
in handling concurrent tasks and reducing response times.
## Search Benchmark Report By VectorDb Bench
Follow
[VectorDBBench](https://github.com/zilliztech/VectorDBBench?tab=readme-ov-file)
to create a VectorDb Bench test for Go 1.20 and Go 1.21. We test the
search performance with Go 1.20 and Go 1.21 (without PGO) on the Milvus
Standalone system. The tests were conducted using the Cohere dataset
with 1 million entries in a 768-dimensional space, utilizing the COSINE
metric type.
Search Metrics:
Metric | Go 1.20 | Go 1.21 without PGO
-- | -- | --
Load Duration (seconds) | 1195.95 | 976.37
Queries Per Second (QPS) | 841.62 | 875.89
99th Percentile Serial Latency (seconds) | 0.0047 | 0.0076
Recall | 0.9487 | 0.9489
### Key Findings
Go 1.21 indicates faster index loading times and larger search QPS
handling.
## PGO Performance Test
Milvus has already added
[net/http/pprof](https://pkg.go.dev/net/http/pprof) in the metrics. So
we can curl the CPU profile directly by running
`curl -o default.pgo
"http://${MILVUS_SERVER_IP}:${MILVUS_SERVER_PORT}/debug/pprof/profile?seconds=${TIME_SECOND}"`
to collect the profile as the default.pgo during the first search. Then
I build Milvus with PGO and use the same index to run the search again.
The result is as below:
Search Metrics
| Metric | Go 1.21 Without PGO | Go 1.21 With PGO | Change (%) |
|---------------------------------------------|------------------|-----------------|------------|
| `search Requests` | 2,644,583 | 2,837,726 | +7.30% |
| `search Fails` | 0 | 0 | N/A |
| `search RT_avg` (ms) | 11.34 | 10.57 | -6.78% |
| `search RT_min` (ms) | 1.39 | 1.32 | -5.18% |
| `search RT_max` (ms) | 349.72 | 143.72 | -58.91% |
| `search TP50` (ms) | 10.57 | 9.93 | -6.05% |
| `search TP99` (ms) | 26.14 | 24.16 | -7.56% |
| `search RPS` | 4,407 | 4,729 | +7.30% |
### Key Findings
PGO led to a notable enhancement in search performance, particularly in
reducing the maximum response time by 58% and increasing the search QPS
by 7.3%.
### Further Analysis
Generate a diff flame graphs between two CPU profiles by running `go
tool pprof -http=:8000 -diff_base nopgo.pgo pgo.pgo -normalize`
<img width="1894" alt="goprofiling"
src="https://github.com/milvus-io/milvus/assets/167743503/ab9e91eb-95c7-4963-acd9-d1c3c73ee010">
Further insight of HnswIndexNode and Milvus Search Handler
<img width="1906" alt="hnsw"
src="https://github.com/milvus-io/milvus/assets/167743503/a04cf4a0-7c97-4451-b3cf-98afc20a0b05">
<img width="1873" alt="search_handler"
src="https://github.com/milvus-io/milvus/assets/167743503/5f4d3982-18dd-4115-8e76-460f7f534c7f">
After applying PGO to the Milvus server, the CPU utilization of the
faiss::fvec_L2 function has decreased. This optimization significantly
enhances the performance of the
[HnswIndexNode::Search::searchKnn](e0c9c41aa2/src/index/hnsw/hnsw.cc (L203))
method, which is frequently invoked by Knowhere during high-concurrency
searches. As the explanation from Go release notes, the function might
be more aggressively inlined by Go compiler during the second build with
the CPU profiling collected from the first run. As a result, the search
handler efficiency within Milvus DataNode has improved, allowing the
server to process a higher number of search queries per second (QPS).
# Conclusion
The combination of Go 1.21 and PGO has led to substantial enhancements
in search performance for Milvus server, particularly in terms of search
QPS and response times, making it more efficient for handling
high-concurrency search operations.
Signed-off-by: shaoting-huang <shaoting.huang@zilliz.com>
Query slot of compaction in datanode, and transfer the control logic for
limiting compaction tasks from datacoord to the datanode.
issue: https://github.com/milvus-io/milvus/issues/32809
---------
Signed-off-by: bigsheeper <yihao.dai@zilliz.com>
issue: #32910
see also: #32911
when channel exclusive mode is enabled, replica will record channel node
info in meta store, and if the balance policy changes, which means
channel exclusive mode is disabled, we should clean up the channel node
info in meta store, and stop to balance node between channels.
Signed-off-by: Wei Liu <wei.liu@zilliz.com>
issue: #32663
- Use new param to control request resource timeout for lazy load.
- Remove the timeout parameter of `Do`, remove `DoWait`. use `context`
to control the timeout.
- Use `VersionedNotifier` to avoid notify event lost and broadcast,
remove the redundant goroutine in cache.
related dev pr: #32684
Signed-off-by: chyezh <chyezh@outlook.com>
issue: #19095,#29655,#31718
- Change `ListWithPrefix` to `WalkWithPrefix` of OOS into a pipeline
mode.
- File garbage collection is performed in other goroutine.
- Segment Index Recycle clean index file too.
---------
Signed-off-by: chyezh <chyezh@outlook.com>
Use an individual buffer size parameter for imports and set buffer size
to 64MB.
issue: https://github.com/milvus-io/milvus/issues/28521
---------
Signed-off-by: bigsheeper <yihao.dai@zilliz.com>
Feature Introduced:
1. Ensure ImportV2 waits for the index to be built
Enhancements Introduced:
1. Utilization of local time for timeout ts instead of allocating ts
from rootcoord.
3. Enhanced input file length check for binlog import.
4. Removal of duplicated manager in datanode.
5. Renaming of executor to scheduler in datanode.
6. Utilization of a thread pool in the scheduler in datanode.
issue: https://github.com/milvus-io/milvus/issues/28521
---------
Signed-off-by: bigsheeper <yihao.dai@zilliz.com>
The max number of import files per request should not exceed 1024 by
default (configurable).
The import file size allowed for importing should not exceed 16GB by
default (configurable).
issue: https://github.com/milvus-io/milvus/issues/28521
Signed-off-by: bigsheeper <yihao.dai@zilliz.com>
/kind improvement
fix: #31272
This pr add more metrics, which are:
- Slow query count, which the duration considered as slow can be
configurable;
- Number of deleted entities;
- Number of entities imported;
- Number of entities per collection;
- Number of loaded entities per collection;
- Number of indexed entities;
- Number of indexed entities, per collection, per index and whether it's
a vetor index;
- Quota states (LongTimeTickDelay, MemoryExhuasted, DiskQuotaExhuasted)
per database;
---------
Signed-off-by: longjiquan <jiquan.long@zilliz.com>
See also #31362
This PR make datacoord garbage collection scan operation using differet
interval than other opeartion.
This interval is a newly added param item, which default value is 7*24
hours.
Signed-off-by: Congqi Xia <congqi.xia@zilliz.com>
This PR includes the following adjustments:
1. To prevent channelCP update task backlog, only one task with the same
vchannel is retained in the updater. Additionally, the lastUpdateTime is
refreshed after the flowgraph submits the update task, rather than in
the callBack function.
2. Batch updates of multiple vchannel checkpoints are performed in the
UpdateChannelCheckpoint RPC (default batch size is 128). Additionally,
the lock for channelCPs in DataCoord meta has been switched from key
lock to global lock.
3. The concurrency of UpdateChannelCheckpoint RPCs in the datanode has
been reduced from 1000 to 10.
issue: https://github.com/milvus-io/milvus/issues/30004
---------
Signed-off-by: bigsheeper <yihao.dai@zilliz.com>
Co-authored-by: jaime <yun.zhang@zilliz.com>
Co-authored-by: congqixia <congqi.xia@zilliz.com>
This PR introduces novel managerial roles for importv2:
1. ImportMeta: To manage all the import tasks;
2. ImportScheduler: To process tasks and modify their states;
3. ImportChecker: To ascertain the completion of all tasks and instigate
relevant operations.
issue: https://github.com/milvus-io/milvus/issues/28521
---------
Signed-off-by: bigsheeper <yihao.dai@zilliz.com>
flush rate control at collection level to avoid generate too much
segment.
0.1 qps by default.
issue: #29477
Signed-off-by: chyezh <ye.zhen@zilliz.com>
This PR introduces novel importv2 roles for datanode:
1. Executor: To execute tasks, a import task will be divided into the
following steps: read data -> hash data -> sync data;
2. Manager: To manage all the tasks;
issue: https://github.com/milvus-io/milvus/issues/28521
---------
Signed-off-by: bigsheeper <yihao.dai@zilliz.com>
issue: #25639
/kind improvement
When the number of vector columns increases, the number of rows per
segment will decrease. In order to reduce the impact on vector indexing
performance, it is necessary to increase the segment max limit.
If a collection has multiple vector fields with memory and disk indices
on different vector fields, the size limit after segment compaction is
the minimum of segment.maxSize and segment.diskSegmentMaxSize.
Signed-off-by: xige-16 <xi.ge@zilliz.com>
---------
Signed-off-by: xige-16 <xi.ge@zilliz.com>
See also #27675
After supporting control sync parallel in datanode globally, the shall
change default value to a more suitable value for most use cases.
Signed-off-by: Congqi Xia <congqi.xia@zilliz.com>
Allows proactive warming up of chunk cache. Original vector data will be
asynchronously loaded into the chunk cache during the load process. It
has the potential to significantly reduce query/search latency for a
certain duration after the load, albeit with a concurrent increase in
disk usage.
issue: https://github.com/milvus-io/milvus/issues/30181
---------
Signed-off-by: bigsheeper <yihao.dai@zilliz.com>
due to `clientMaxSendSize` and `serverMaxRecvSize` will limit the rpc
request size limit, they should use same config value, and
`serverMaxSendSize` and `clientMaxRecvSize` will limit the rpc response
size limit, they should use same config value too.
This PR fix unexpected rpc msg limit which caused by the wrong usage of
misunderstanding rpc config items
Signed-off-by: Wei Liu <wei.liu@zilliz.com>
