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Posted to commits@doris.apache.org by "morningman (via GitHub)" <gi...@apache.org> on 2023/08/05 07:23:10 UTC
[GitHub] [doris] morningman opened a new pull request, #22634: [improvement](hdfs) support hedged read
morningman opened a new pull request, #22634:
URL: https://github.com/apache/doris/pull/22634
## Proposed changes
In some cases, the high load of HDFS may lead to a long time to read the data on HDFS,
thereby slowing down the overall query efficiency. HDFS Client provides Hedged Read.
This function can start another read thread to read the same data when a read request
exceeds a certain threshold and is not returned, and whichever is returned first will use the result.
eg:
```
create catalog regression properties (
'type'='hms',
'hive.metastore.uris' = 'thrift://172.21.16.47:7004',
'dfs.client.hedged.read.threadpool.size' = '128',
'dfs.client.hedged.read.threshold.millis' = "500"
);
```
## Further comments
If this is a relatively large or complex change, kick off the discussion at [dev@doris.apache.org](mailto:dev@doris.apache.org) by explaining why you chose the solution you did and what alternatives you considered, etc...
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[GitHub] [doris] hello-stephen commented on pull request #22634: [improvement](hdfs) support hedged read
Posted by "hello-stephen (via GitHub)" <gi...@apache.org>.
hello-stephen commented on PR #22634:
URL: https://github.com/apache/doris/pull/22634#issuecomment-1666474091
(From new machine)TeamCity pipeline, clickbench performance test result:
the sum of best hot time: 45.23 seconds
stream load tsv: 514 seconds loaded 74807831229 Bytes, about 138 MB/s
stream load json: 21 seconds loaded 2358488459 Bytes, about 107 MB/s
stream load orc: 64 seconds loaded 1101869774 Bytes, about 16 MB/s
stream load parquet: 31 seconds loaded 861443392 Bytes, about 26 MB/s
insert into select: 28.9 seconds inserted 10000000 Rows, about 346K ops/s
storage size: 17162094491 Bytes
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[GitHub] [doris] github-actions[bot] commented on pull request #22634: [improvement](hdfs) support hedged read
Posted by "github-actions[bot] (via GitHub)" <gi...@apache.org>.
github-actions[bot] commented on PR #22634:
URL: https://github.com/apache/doris/pull/22634#issuecomment-1666535553
PR approved by at least one committer and no changes requested.
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[GitHub] [doris] yiguolei merged pull request #22634: [improvement](hdfs) support hedged read
Posted by "yiguolei (via GitHub)" <gi...@apache.org>.
yiguolei merged PR #22634:
URL: https://github.com/apache/doris/pull/22634
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[GitHub] [doris] github-actions[bot] commented on pull request #22634: [improvement](hdfs) support hedged read
Posted by "github-actions[bot] (via GitHub)" <gi...@apache.org>.
github-actions[bot] commented on PR #22634:
URL: https://github.com/apache/doris/pull/22634#issuecomment-1666455178
clang-tidy review says "All clean, LGTM! :+1:"
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[GitHub] [doris] github-actions[bot] commented on pull request #22634: [improvement](hdfs) support hedged read
Posted by "github-actions[bot] (via GitHub)" <gi...@apache.org>.
github-actions[bot] commented on PR #22634:
URL: https://github.com/apache/doris/pull/22634#issuecomment-1666535560
PR approved by anyone and no changes requested.
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[GitHub] [doris] github-actions[bot] commented on pull request #22634: [improvement](hdfs) support hedged read
Posted by "github-actions[bot] (via GitHub)" <gi...@apache.org>.
github-actions[bot] commented on PR #22634:
URL: https://github.com/apache/doris/pull/22634#issuecomment-1666426853
clang-tidy review says "All clean, LGTM! :+1:"
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[GitHub] [doris] github-actions[bot] commented on pull request #22634: [improvement](hdfs) support hedged read
Posted by "github-actions[bot] (via GitHub)" <gi...@apache.org>.
github-actions[bot] commented on PR #22634:
URL: https://github.com/apache/doris/pull/22634#issuecomment-1666449485
clang-tidy review says "All clean, LGTM! :+1:"
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[GitHub] [doris] github-actions[bot] commented on pull request #22634: [improvement](hdfs) support hedged read
Posted by "github-actions[bot] (via GitHub)" <gi...@apache.org>.
github-actions[bot] commented on PR #22634:
URL: https://github.com/apache/doris/pull/22634#issuecomment-1666426082
clang-tidy review says "All clean, LGTM! :+1:"
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[GitHub] [doris] morningman commented on pull request #22634: [improvement](hdfs) support hedged read
Posted by "morningman (via GitHub)" <gi...@apache.org>.
morningman commented on PR #22634:
URL: https://github.com/apache/doris/pull/22634#issuecomment-1666457243
run buildall
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[GitHub] [doris] github-actions[bot] commented on pull request #22634: [improvement](hdfs) support hedged read
Posted by "github-actions[bot] (via GitHub)" <gi...@apache.org>.
github-actions[bot] commented on PR #22634:
URL: https://github.com/apache/doris/pull/22634#issuecomment-1666428157
clang-tidy review says "All clean, LGTM! :+1:"
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[GitHub] [doris] github-actions[bot] commented on pull request #22634: [improvement](hdfs) support hedged read
Posted by "github-actions[bot] (via GitHub)" <gi...@apache.org>.
github-actions[bot] commented on PR #22634:
URL: https://github.com/apache/doris/pull/22634#issuecomment-1666426786
clang-tidy review says "All clean, LGTM! :+1:"
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[GitHub] [doris] morningman commented on pull request #22634: [improvement](hdfs) support hedged read
Posted by "morningman (via GitHub)" <gi...@apache.org>.
morningman commented on PR #22634:
URL: https://github.com/apache/doris/pull/22634#issuecomment-1666447417
run buildall
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