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Posted to common-issues@hadoop.apache.org by GitBox <gi...@apache.org> on 2022/07/30 03:40:27 UTC
[GitHub] [hadoop] ZanderXu opened a new pull request, #4661: HDFS-16704. Datanode return empty response instead of NPE for GetVolumeInfo during restarting
ZanderXu opened a new pull request, #4661:
URL: https://github.com/apache/hadoop/pull/4661
### Description of PR
During datanode starting, I found some NPE in logs:
```
Caused by: java.lang.NullPointerException: Storage not yet initialized
at org.apache.hadoop.thirdparty.com.google.common.base.Preconditions.checkNotNull(Preconditions.java:899)
at org.apache.hadoop.hdfs.server.datanode.DataNode.getVolumeInfo(DataNode.java:3533)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at sun.reflect.misc.Trampoline.invoke(MethodUtil.java:72)
at sun.reflect.GeneratedMethodAccessor7.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at sun.reflect.misc.MethodUtil.invoke(MethodUtil.java:276)
at com.sun.jmx.mbeanserver.ConvertingMethod.invokeWithOpenReturn(ConvertingMethod.java:193)
at com.sun.jmx.mbeanserver.ConvertingMethod.invokeWithOpenReturn(ConvertingMethod.java:175)
```
Because the storage of datanode not yet initialized when we trying to get metrics of datanode, and related code as below:
```
@Override // DataNodeMXBean
public String getVolumeInfo() {
Preconditions.checkNotNull(data, "Storage not yet initialized");
return JSON.toString(data.getVolumeInfoMap());
}
```
The logic is ok, but I feel that the more reasonable logic should be return an empty response instead of NPE, because InfoServer will be started before initBlockPool.
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[GitHub] [hadoop] Hexiaoqiao commented on pull request #4661: HDFS-16704. Datanode return empty response instead of NPE for GetVolumeInfo during restarting
Posted by GitBox <gi...@apache.org>.
Hexiaoqiao commented on PR #4661:
URL: https://github.com/apache/hadoop/pull/4661#issuecomment-1214980333
Committed to trunk. Thanks @ZanderXu for your contribution, Thanks @ayushtkn for your reviews.
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[GitHub] [hadoop] hadoop-yetus commented on pull request #4661: HDFS-16704. Datanode return empty response instead of NPE for GetVolumeInfo during restarting
Posted by GitBox <gi...@apache.org>.
hadoop-yetus commented on PR #4661:
URL: https://github.com/apache/hadoop/pull/4661#issuecomment-1200124086
:broken_heart: **-1 overall**
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[GitHub] [hadoop] Hexiaoqiao merged pull request #4661: HDFS-16704. Datanode return empty response instead of NPE for GetVolumeInfo during restarting
Posted by GitBox <gi...@apache.org>.
Hexiaoqiao merged PR #4661:
URL: https://github.com/apache/hadoop/pull/4661
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[GitHub] [hadoop] ZanderXu commented on pull request #4661: HDFS-16704. Datanode return empty response instead of NPE for GetVolumeInfo during restarting
Posted by GitBox <gi...@apache.org>.
ZanderXu commented on PR #4661:
URL: https://github.com/apache/hadoop/pull/4661#issuecomment-1207529359
Yes, we are here, and I have create a new [PR-4699](https://github.com/apache/hadoop/pull/4699) to fix other cases in DataNode.java.
@ayushtkn @Hexiaoqiao Can you help me review them and give me a suggestion that we fix them in two PR or one?
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[GitHub] [hadoop] ayushtkn commented on pull request #4661: HDFS-16704. Datanode return empty response instead of NPE for GetVolumeInfo during restarting
Posted by GitBox <gi...@apache.org>.
ayushtkn commented on PR #4661:
URL: https://github.com/apache/hadoop/pull/4661#issuecomment-1207485847
Are we good here? or Waiting for some more modifications?
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[GitHub] [hadoop] Hexiaoqiao commented on pull request #4661: HDFS-16704. Datanode return empty response instead of NPE for GetVolumeInfo during restarting
Posted by GitBox <gi...@apache.org>.
Hexiaoqiao commented on PR #4661:
URL: https://github.com/apache/hadoop/pull/4661#issuecomment-1203949940
@ZanderXu Thanks for your contribution. IIRC, there is also some other precondition checks before initialized, Would you mind to give another check? such as `org.apache.hadoop.hdfs.server.datanode.DataNode#initReplicaRecovery` or `replicaHandler = datanode.data.createRbw(storageType, storageId, block, allowLazyPersist);` (which datanode.data is null before DataNode initialized) at [here](https://github.com/apache/hadoop/blob/b7edc6c60ca9e17c4f6a7d07aad5efbd7c2e3b40/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/BlockReceiver.java#L219).
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[GitHub] [hadoop] ZanderXu commented on pull request #4661: HDFS-16704. Datanode return empty response instead of NPE for GetVolumeInfo during restarting
Posted by GitBox <gi...@apache.org>.
ZanderXu commented on PR #4661:
URL: https://github.com/apache/hadoop/pull/4661#issuecomment-1201945547
@ayushtkn Thank you very much for helping me review it.
Yes, you are right, we should return an empty value for this case. How about change it same with `getDiskBalancerStatus`, such as:
```
@Override // DataNodeMXBean
public String getVolumeInfo() {
if (data == null) {
LOG.debug("Storage not yet initialized.");
return ""; // it's different with JSON.toString(new HashMap<String, Object>())
}
return JSON.toString(data.getVolumeInfoMap());
}
```
Developers or SREs are very sensitive to NPE, so I feel we shouldn't out put it in this expected situation.
> Extra Stuff: This log line just below is wrong, incorrect placeholder, can fix in a separate jira if interested. :-)
Copy, sir. I will fix it in a separate Jira.
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[GitHub] [hadoop] ZanderXu commented on pull request #4661: HDFS-16704. Datanode return empty response instead of NPE for GetVolumeInfo during restarting
Posted by GitBox <gi...@apache.org>.
ZanderXu commented on PR #4661:
URL: https://github.com/apache/hadoop/pull/4661#issuecomment-1204212206
@Hexiaoqiao Thanks for your review.
> Would you mind to give another check?
Sure, I will check them. BTW, If it's ok, can I fix them in a new PR? I hope this PR is just used to fix NPE in `getVolumeInfo()`.
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[GitHub] [hadoop] hadoop-yetus commented on pull request #4661: HDFS-16704. Datanode return empty response instead of NPE for GetVolumeInfo during restarting
Posted by GitBox <gi...@apache.org>.
hadoop-yetus commented on PR #4661:
URL: https://github.com/apache/hadoop/pull/4661#issuecomment-1203113202
:broken_heart: **-1 overall**
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[GitHub] [hadoop] ZanderXu commented on pull request #4661: HDFS-16704. Datanode return empty response instead of NPE for GetVolumeInfo during restarting
Posted by GitBox <gi...@apache.org>.
ZanderXu commented on PR #4661:
URL: https://github.com/apache/hadoop/pull/4661#issuecomment-1214872605
@Hexiaoqiao @ayushtkn Master, ping, please help me merge this PR and review [PR-4699](https://github.com/apache/hadoop/pull/4699)? Thanks
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[GitHub] [hadoop] hadoop-yetus commented on pull request #4661: HDFS-16704. Datanode return empty response instead of NPE for GetVolumeInfo during restarting
Posted by GitBox <gi...@apache.org>.
hadoop-yetus commented on PR #4661:
URL: https://github.com/apache/hadoop/pull/4661#issuecomment-1215298271
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| +1 :green_heart: | shadedclient | 22m 43s | | patch has no errors when building and testing our client artifacts. |
|||| _ Other Tests _ |
| +1 :green_heart: | unit | 237m 9s | | hadoop-hdfs in the patch passed. |
| +1 :green_heart: | asflicense | 1m 15s | | The patch does not generate ASF License warnings. |
| | | 347m 10s | | |
| Subsystem | Report/Notes |
|----------:|:-------------|
| Docker | ClientAPI=1.41 ServerAPI=1.41 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-4661/3/artifact/out/Dockerfile |
| GITHUB PR | https://github.com/apache/hadoop/pull/4661 |
| Optional Tests | dupname asflicense compile javac javadoc mvninstall mvnsite unit shadedclient spotbugs checkstyle codespell detsecrets |
| uname | Linux f2e8f1a1b377 4.15.0-58-generic #64-Ubuntu SMP Tue Aug 6 11:12:41 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux |
| Build tool | maven |
| Personality | dev-support/bin/hadoop.sh |
| git revision | trunk / 2af6c2bf0f3163ade7457a10f3b29e6afc34906e |
| Default Java | Private Build-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07 |
| Multi-JDK versions | /usr/lib/jvm/java-11-openjdk-amd64:Private Build-11.0.15+10-Ubuntu-0ubuntu0.20.04.1 /usr/lib/jvm/java-8-openjdk-amd64:Private Build-1.8.0_312-8u312-b07-0ubuntu1~20.04-b07 |
| Test Results | https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-4661/3/testReport/ |
| Max. process+thread count | 3385 (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-4661/3/console |
| versions | git=2.25.1 maven=3.6.3 spotbugs=4.2.2 |
| Powered by | Apache Yetus 0.14.0 https://yetus.apache.org |
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