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Posted to common-issues@hadoop.apache.org by GitBox <gi...@apache.org> on 2022/03/24 03:51:16 UTC
[GitHub] [hadoop] cndaimin opened a new pull request #4101: HDFS-16519. Add throttler to EC reconstruction
cndaimin opened a new pull request #4101:
URL: https://github.com/apache/hadoop/pull/4101
HDFS already have throttlers for data transfer(replication) and balancer, the throttlers reduce the impact of these background procedures to user read/write.
We should add a throttler to EC background reconstruction too.
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[GitHub] [hadoop] tomscut commented on pull request #4101: HDFS-16519. Add throttler to EC reconstruction
Posted by GitBox <gi...@apache.org>.
tomscut commented on pull request #4101:
URL: https://github.com/apache/hadoop/pull/4101#issuecomment-1085245717
> @tomscut Thanks for your review. Yes, background reconstruction is necessary. With missing block(s) of block group, client has to read `dataUnits` blocks in block group to decode the target data. This causes `dataUnits` times of network traffic and corresponding cpu costs. In our product cluster, we encountered backgroud reconstruction exhausts the network traffic of DN node. This leads to the failure of client read/write. The speed of read/write and reconstruction is in conflict, we can not have both of them actually. And in practice, we set throttler of EC reconstruction to half of available network traffic, for example, 500 MB/s to 1GB/s NIC. In this PR, we set the default value to 0, which indicates there is no limit to reconstruction at all, to be sure there is no side effect to upgrade.
Thanks @cndaimin for your explanation.
Hi @tasanuma @Hexiaoqiao, could you please give me some advice? Thanks.
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[GitHub] [hadoop] hadoop-yetus commented on pull request #4101: HDFS-16519. Add throttler to EC reconstruction
Posted by GitBox <gi...@apache.org>.
hadoop-yetus commented on pull request #4101:
URL: https://github.com/apache/hadoop/pull/4101#issuecomment-1077857491
:broken_heart: **-1 overall**
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[GitHub] [hadoop] cndaimin commented on pull request #4101: HDFS-16519. Add throttler to EC reconstruction
Posted by GitBox <gi...@apache.org>.
cndaimin commented on pull request #4101:
URL: https://github.com/apache/hadoop/pull/4101#issuecomment-1081368937
@tomscut Thanks for your review. Yes, background reconstruction is necessary. With missing block(s) of block group, client has to read `dataUnits` blocks in block group to decode the target data. This causes `dataUnits` times of network traffic and corresponding cpu costs.
In our product cluster, we encountered backgroud reconstruction exhausts the network traffic of DN node. This leads to the failure of client read/write. The speed of read/write and reconstruction is in conflict, we can not have both of them actually. And in practice, we set throttler of EC reconstruction to half of available network traffic, for example, 500 MB/s to 1GB/s NIC. In this PR, we set the default value to 0, which indicates there is no limit to reconstruction at all, to be sure there is no side effect to upgrade.
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[GitHub] [hadoop] hadoop-yetus commented on pull request #4101: HDFS-16519. Add throttler to EC reconstruction
Posted by GitBox <gi...@apache.org>.
hadoop-yetus commented on pull request #4101:
URL: https://github.com/apache/hadoop/pull/4101#issuecomment-1083426601
:broken_heart: **-1 overall**
| Vote | Subsystem | Runtime | Logfile | Comment |
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| +0 :ok: | reexec | 0m 45s | | Docker mode activated. |
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| +0 :ok: | codespell | 0m 0s | | codespell was not available. |
| +1 :green_heart: | @author | 0m 0s | | The patch does not contain any @author tags. |
| -1 :x: | test4tests | 0m 0s | | The patch doesn't appear to include any new or modified tests. Please justify why no new tests are needed for this patch. Also please list what manual steps were performed to verify this patch. |
|||| _ trunk Compile Tests _ |
| +1 :green_heart: | mvninstall | 36m 28s | | trunk passed |
| +1 :green_heart: | compile | 1m 41s | | trunk passed with JDK Ubuntu-11.0.14+9-Ubuntu-0ubuntu2.20.04 |
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| +1 :green_heart: | mvninstall | 1m 21s | | the patch passed |
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|||| _ Other Tests _ |
| -1 :x: | unit | 229m 2s | [/patch-unit-hadoop-hdfs-project_hadoop-hdfs.txt](https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-4101/3/artifact/out/patch-unit-hadoop-hdfs-project_hadoop-hdfs.txt) | hadoop-hdfs in the patch passed. |
| +1 :green_heart: | asflicense | 0m 47s | | The patch does not generate ASF License warnings. |
| | | 340m 43s | | |
| Reason | Tests |
|-------:|:------|
| Failed junit tests | hadoop.tools.TestHdfsConfigFields |
| Subsystem | Report/Notes |
|----------:|:-------------|
| Docker | ClientAPI=1.41 ServerAPI=1.41 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-4101/3/artifact/out/Dockerfile |
| GITHUB PR | https://github.com/apache/hadoop/pull/4101 |
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| uname | Linux b27e268504f9 4.15.0-58-generic #64-Ubuntu SMP Tue Aug 6 11:12:41 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux |
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| Max. process+thread count | 3130 (vs. ulimit of 5500) |
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| versions | git=2.25.1 maven=3.6.3 spotbugs=4.2.2 |
| Powered by | Apache Yetus 0.14.0-SNAPSHOT https://yetus.apache.org |
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