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Posted to common-issues@hadoop.apache.org by "balodesecurity (via GitHub)" <gi...@apache.org> on 2026/03/02 08:12:13 UTC
[PR] HDFS-16842. DatanodeHttpServer does not update config after refreshNamenodes [hadoop]
balodesecurity opened a new pull request, #8291:
URL: https://github.com/apache/hadoop/pull/8291
## Problem
When `DataNode.refreshNamenodes()` is called to add a new nameservice it reloads configuration via `setConf(new Configuration())`, but `DatanodeHttpServer` kept holding a stale reference to the old `Configuration`. Subsequent WebHDFS requests for blocks on the newly-added nameservice would fail because the `DFSClient` created per-request could not resolve the namenode addresses for that nameservice from the stale config.
Root cause: `DatanodeHttpServer.conf` and `confForCreate` were `final` fields set once at construction time. `DataNode.refreshNamenodes()` never called any update method on `httpServer`.
## Fix
- Make `conf` and `confForCreate` in `DatanodeHttpServer` `volatile` (non-final) so Netty I/O threads see updates atomically.
- Add `DatanodeHttpServer.updateConf(Configuration newConf)` that refreshes both fields and the embedded Jetty `infoServer`'s servlet-context attributes (`CONF_CONTEXT_ATTRIBUTE`, `CURRENT_CONF`).
- Call `httpServer.updateConf(getConf())` at the end of `DataNode.refreshNamenodes()` after the new configuration has been loaded.
The Netty `ChannelInitializer` creates a fresh `URLDispatcher` per connection and reads `DatanodeHttpServer.conf` at that point, so new connections automatically pick up the updated configuration without requiring a pipeline or server restart.
## Testing
- Added `TestDatanodeHttpServerUpdateConf.testUpdateConfRefreshesFields` — a unit test (no cluster required) that:
- Creates a `DatanodeHttpServer` with an initial configuration.
- Calls `updateConf(newConf)`.
- Asserts (via reflection) that the `conf` and `confForCreate` instance fields now reference the updated configuration.
- Asserts that the Jetty `infoServer` servlet-context attributes have been updated.
```
Tests run: 1, Failures: 0, Errors: 0, Skipped: 0
```
## Related
- JIRA: https://issues.apache.org/jira/browse/HDFS-16842
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Re: [PR] HDFS-16842. DatanodeHttpServer does not update config after refreshNamenodes [hadoop]
Posted by "hadoop-yetus (via GitHub)" <gi...@apache.org>.
hadoop-yetus commented on PR #8291:
URL: https://github.com/apache/hadoop/pull/8291#issuecomment-3990748586
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Re: [PR] HDFS-16842. DatanodeHttpServer does not update config after refreshNamenodes [hadoop]
Posted by "hadoop-yetus (via GitHub)" <gi...@apache.org>.
hadoop-yetus commented on PR #8291:
URL: https://github.com/apache/hadoop/pull/8291#issuecomment-4031897705
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Re: [PR] HDFS-16842. DatanodeHttpServer does not update config after refreshNamenodes [hadoop]
Posted by "hadoop-yetus (via GitHub)" <gi...@apache.org>.
hadoop-yetus commented on PR #8291:
URL: https://github.com/apache/hadoop/pull/8291#issuecomment-4092042531
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Re: [PR] HDFS-16842. DatanodeHttpServer does not update config after refreshNamenodes [hadoop]
Posted by "hadoop-yetus (via GitHub)" <gi...@apache.org>.
hadoop-yetus commented on PR #8291:
URL: https://github.com/apache/hadoop/pull/8291#issuecomment-3985203993
:broken_heart: **-1 overall**
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Re: [PR] HDFS-16842. DatanodeHttpServer does not update config after refreshNamenodes [hadoop]
Posted by "hadoop-yetus (via GitHub)" <gi...@apache.org>.
hadoop-yetus commented on PR #8291:
URL: https://github.com/apache/hadoop/pull/8291#issuecomment-3982903014
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Re: [PR] HDFS-16842. DatanodeHttpServer does not update config after refreshNamenodes [hadoop]
Posted by "hadoop-yetus (via GitHub)" <gi...@apache.org>.
hadoop-yetus commented on PR #8291:
URL: https://github.com/apache/hadoop/pull/8291#issuecomment-3982956837
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Re: [PR] HDFS-16842. DatanodeHttpServer does not update config after refreshNamenodes [hadoop]
Posted by "ajfabbri (via GitHub)" <gi...@apache.org>.
ajfabbri commented on PR #8291:
URL: https://github.com/apache/hadoop/pull/8291#issuecomment-4091840883
Hi and thanks for the patch. I do not know this code very well but have a couple of questions.
> Make conf and confForCreate in DatanodeHttpServer volatile (non-final) so Netty I/O threads see updates atomically.
Just to be clear, `volatile` adds memory barriers around read/write of the reference, but does not make updates to object fields atomic.
My main confusion is around locking on `Configuration`. For example, the cloning constructor for `Configuration`:
```java
public Configuration(Configuration other) {
synchronized(other) {
...
```
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Re: [PR] HDFS-16842. DatanodeHttpServer does not update config after refreshNamenodes [hadoop]
Posted by "hadoop-yetus (via GitHub)" <gi...@apache.org>.
hadoop-yetus commented on PR #8291:
URL: https://github.com/apache/hadoop/pull/8291#issuecomment-3982829181
:broken_heart: **-1 overall**
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Re: [PR] HDFS-16842. DatanodeHttpServer does not update config after refreshNamenodes [hadoop]
Posted by "hadoop-yetus (via GitHub)" <gi...@apache.org>.
hadoop-yetus commented on PR #8291:
URL: https://github.com/apache/hadoop/pull/8291#issuecomment-4099788916
:confetti_ball: **+1 overall**
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| +1 :green_heart: | shadedclient | 30m 25s | | patch has no errors when building and testing our client artifacts. |
|||| _ Other Tests _ |
| +1 :green_heart: | unit | 217m 57s | | hadoop-hdfs in the patch passed. |
| +1 :green_heart: | asflicense | 0m 45s | | The patch does not generate ASF License warnings. |
| | | 346m 49s | | |
| Subsystem | Report/Notes |
|----------:|:-------------|
| Docker | ClientAPI=1.54 ServerAPI=1.54 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-8291/8/artifact/out/Dockerfile |
| GITHUB PR | https://github.com/apache/hadoop/pull/8291 |
| Optional Tests | dupname asflicense compile javac javadoc mvninstall mvnsite unit shadedclient spotbugs checkstyle codespell detsecrets |
| uname | Linux ec999d08dbdc 5.15.0-173-generic #183-Ubuntu SMP Fri Mar 6 13:29:34 UTC 2026 x86_64 x86_64 x86_64 GNU/Linux |
| Build tool | maven |
| Personality | dev-support/bin/hadoop.sh |
| git revision | trunk / 120c69632dd0d7a7aa89866058bcf4de96d3ac3f |
| Default Java | Ubuntu-17.0.18+8-Ubuntu-124.04.1 |
| Multi-JDK versions | /usr/lib/jvm/java-21-openjdk-amd64:Ubuntu-21.0.10+7-Ubuntu-124.04 /usr/lib/jvm/java-17-openjdk-amd64:Ubuntu-17.0.18+8-Ubuntu-124.04.1 |
| Test Results | https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-8291/8/testReport/ |
| Max. process+thread count | 3490 (vs. ulimit of 5500) |
| modules | C: hadoop-hdfs-project/hadoop-hdfs U: hadoop-hdfs-project/hadoop-hdfs |
| Console output | https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-8291/8/console |
| versions | git=2.43.0 maven=3.9.11 spotbugs=4.9.7 |
| Powered by | Apache Yetus 0.14.1 https://yetus.apache.org |
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Re: [PR] HDFS-16842. DatanodeHttpServer does not update config after refreshNamenodes [hadoop]
Posted by "balodesecurity (via GitHub)" <gi...@apache.org>.
balodesecurity commented on PR #8291:
URL: https://github.com/apache/hadoop/pull/8291#issuecomment-4018675765
CI failed due to Jenkins Docker infrastructure issue (apt-get failure and yetus/hadoop image pull denied) — unrelated to the patch. Requesting retest.
/retest
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