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Posted to common-issues@hadoop.apache.org by GitBox <gi...@apache.org> on 2022/06/14 08:32:37 UTC
[GitHub] [hadoop] slfan1989 opened a new pull request, #4438: HDFS-16631. Enable dfs.datanode.lockmanager.trace In Test.
slfan1989 opened a new pull request, #4438:
URL: https://github.com/apache/hadoop/pull/4438
JIRA:HDFS-16631. Enable dfs.datanode.lockmanager.trace In Test.
In Jira [HDFS-16600](https://issues.apache.org/jira/browse/HDFS-16600). Fix deadlock on DataNode side. We discussed the issue of deadlock, this is a very meaningful discussion, I was reading the log and found the following:
```
2022-05-27 07:39:47,890 [Listener at localhost/36941] WARN datanode.DataSetLockManager (DataSetLockManager.java:lockLeakCheck(261)) -
not open lock leak check func.
```
Looking at the code, I found that there is such a parameter:
```
<property>
<name>dfs.datanode.lockmanager.trace</name>
<value>false</value>
<description>
If this is true, after shut down datanode lock Manager will print all leak
thread that not release by lock Manager. Only used for test or trace dead lock
problem. In produce default set false, because it's have little performance loss.
</description>
</property>
```
I think this parameter should be added in the test environment, so that if there is a DN deadlock, the cause can be quickly located.
If my understanding is correct, if a thread needs both read locks and write locks, if this parameter is true, relevant thread information can be printed.
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[GitHub] [hadoop] hadoop-yetus commented on pull request #4438: HDFS-16631. Enable dfs.datanode.lockmanager.trace In Test.
Posted by GitBox <gi...@apache.org>.
hadoop-yetus commented on PR #4438:
URL: https://github.com/apache/hadoop/pull/4438#issuecomment-1158989376
:confetti_ball: **+1 overall**
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[GitHub] [hadoop] slfan1989 closed pull request #4438: HDFS-16631. Enable dfs.datanode.lockmanager.trace In Test.
Posted by GitBox <gi...@apache.org>.
slfan1989 closed pull request #4438: HDFS-16631. Enable dfs.datanode.lockmanager.trace In Test.
URL: https://github.com/apache/hadoop/pull/4438
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[GitHub] [hadoop] slfan1989 commented on pull request #4438: HDFS-16631. Enable dfs.datanode.lockmanager.trace In Test.
Posted by GitBox <gi...@apache.org>.
slfan1989 commented on PR #4438:
URL: https://github.com/apache/hadoop/pull/4438#issuecomment-1159337745
readLock
```
getVolume(final ExtendedBlock b)
getStoredBlock(String bpid, long blkid)
Set<? extends Replica> deepCopyReplica(String bpid)
getBlockInputStream(ExtendedBlock b, long seekOffset)
moveBlockAcrossStorage(ExtendedBlock block, StorageType targetStorageType, String targetStorageId)
moveBlockAcrossVolumes(ExtendedBlock block, FsVolumeSpi destination)
ReplicaHandler createRbw(StorageType storageType, String storageId, ExtendedBlock b, boolean allowLazyPersist)
Map<DatanodeStorage, BlockListAsLongs> getBlockReports(String bpid)
public List<ReplicaInfo> getFinalizedBlocks(String bpid)
public boolean contains(final ExtendedBlock block)
public String getReplicaString(String bpid, long blockId)
public long getReplicaVisibleLength(final ExtendedBlock block)
public BlockLocalPathInfo getBlockLocalPathInfo(ExtendedBlock block)
```
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[GitHub] [hadoop] slfan1989 commented on pull request #4438: HDFS-16631. Enable dfs.datanode.lockmanager.trace In Test.
Posted by GitBox <gi...@apache.org>.
slfan1989 commented on PR #4438:
URL: https://github.com/apache/hadoop/pull/4438#issuecomment-1154936417
> DataSetLockManager only print lock trace when invoke DataNode.shutdown() or dataSetLockManager.lockLeakCheck().So I doubt it will work in all UT.
Thanks for the suggestion, I think this parameter can cover scenarios like HDFS-16600, DN shutdown will definitely be called in Junit Test, I personally feel that if there is an error in the junit test of DN and if you suspect a deadlock, you can see this print message.
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[GitHub] [hadoop] slfan1989 commented on pull request #4438: HDFS-16631. Enable dfs.datanode.lockmanager.trace In Test.
Posted by GitBox <gi...@apache.org>.
slfan1989 commented on PR #4438:
URL: https://github.com/apache/hadoop/pull/4438#issuecomment-1154938140
> Ans should we throw Exception ? Most of user will ignore if just print the log.
If a thread obtains a read lock (write lock) and needs to obtain a write lock (read lock), will an exception be thrown directly?
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[GitHub] [hadoop] hadoop-yetus commented on pull request #4438: HDFS-16631. Enable dfs.datanode.lockmanager.trace In Test.
Posted by GitBox <gi...@apache.org>.
hadoop-yetus commented on PR #4438:
URL: https://github.com/apache/hadoop/pull/4438#issuecomment-1159345763
:confetti_ball: **+1 overall**
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| +1 :green_heart: | unit | 1m 26s | | hadoop-hdfs in the patch passed. |
| +1 :green_heart: | asflicense | 0m 44s | | The patch does not generate ASF License warnings. |
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[GitHub] [hadoop] MingXiangLi commented on pull request #4438: HDFS-16631. Enable dfs.datanode.lockmanager.trace In Test.
Posted by GitBox <gi...@apache.org>.
MingXiangLi commented on PR #4438:
URL: https://github.com/apache/hadoop/pull/4438#issuecomment-1154927638
DataSetLockManager only print lock trace when invoke DataNode.shutdown() or dataSetLockManager.lockLeakCheck().So I doubt it will work in all UT.
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[GitHub] [hadoop] slfan1989 commented on pull request #4438: HDFS-16631. Enable dfs.datanode.lockmanager.trace In Test.
Posted by GitBox <gi...@apache.org>.
slfan1989 commented on PR #4438:
URL: https://github.com/apache/hadoop/pull/4438#issuecomment-1158832553
> From my side, I do not think enable lock trace only is good idea for tests as @MingXiangLi has mentioned above. The only INFO level log will not help to debug or test. IMO, if there are some cases we would like to cover and need to collect locks information, it is better to add some inject logic. FYI.
Thank you very much for your suggestion, I will think about how to collect lock information!
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[GitHub] [hadoop] MingXiangLi commented on pull request #4438: HDFS-16631. Enable dfs.datanode.lockmanager.trace In Test.
Posted by GitBox <gi...@apache.org>.
MingXiangLi commented on PR #4438:
URL: https://github.com/apache/hadoop/pull/4438#issuecomment-1154930047
Ans should we throw Exception ? Most of user will ignore if just print the log.
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[GitHub] [hadoop] ZanderXu commented on pull request #4438: HDFS-16631. Enable dfs.datanode.lockmanager.trace In Test.
Posted by GitBox <gi...@apache.org>.
ZanderXu commented on PR #4438:
URL: https://github.com/apache/hadoop/pull/4438#issuecomment-1155258147
@slfan1989 It's a good idea. But I personally feel that it would be nice to thrown exception directly in the test environment when there is a lock leak.
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[GitHub] [hadoop] slfan1989 commented on pull request #4438: HDFS-16631. Enable dfs.datanode.lockmanager.trace In Test.
Posted by GitBox <gi...@apache.org>.
slfan1989 commented on PR #4438:
URL: https://github.com/apache/hadoop/pull/4438#issuecomment-1155921035
@MingXiangLi @ZanderXu Thanks for helping to review the code, can I make the following changes?
```
public void lockLeakCheck() throws Exception {
if (!openLockTrace) {
LOG.warn("not open lock leak check func");
return;
}
if (threadCountMap.isEmpty()) {
LOG.warn("all lock has release");
return;
}
setLastException(new Exception("lock Leak"));
threadCountMap.forEach((name, trackLog) -> trackLog.showLockMessage());
// throw exception ?
throw new Exception("lock Leak");
}
```
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[GitHub] [hadoop] hadoop-yetus commented on pull request #4438: HDFS-16631. Enable dfs.datanode.lockmanager.trace In Test.
Posted by GitBox <gi...@apache.org>.
hadoop-yetus commented on PR #4438:
URL: https://github.com/apache/hadoop/pull/4438#issuecomment-1154982248
:confetti_ball: **+1 overall**
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[GitHub] [hadoop] slfan1989 commented on pull request #4438: HDFS-16631. Enable dfs.datanode.lockmanager.trace In Test.
Posted by GitBox <gi...@apache.org>.
slfan1989 commented on PR #4438:
URL: https://github.com/apache/hadoop/pull/4438#issuecomment-1154882633
@Hexiaoqiao @MingXiangLi @ZanderXu please help me review the code.
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[GitHub] [hadoop] Hexiaoqiao commented on pull request #4438: HDFS-16631. Enable dfs.datanode.lockmanager.trace In Test.
Posted by GitBox <gi...@apache.org>.
Hexiaoqiao commented on PR #4438:
URL: https://github.com/apache/hadoop/pull/4438#issuecomment-1158695959
From my side, I do not think enable lock trace only is good idea for tests as @MingXiangLi has mentioned above. The only INFO level log will not help to debug or test. IMO, if there are some cases we would like to cover and need to collect locks information, it is better to add some inject logic. FYI.
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[GitHub] [hadoop] hadoop-yetus commented on pull request #4438: HDFS-16631. Enable dfs.datanode.lockmanager.trace In Test.
Posted by GitBox <gi...@apache.org>.
hadoop-yetus commented on PR #4438:
URL: https://github.com/apache/hadoop/pull/4438#issuecomment-1159014765
:confetti_ball: **+1 overall**
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| +1 :green_heart: | unit | 1m 27s | | hadoop-hdfs in the patch passed. |
| +1 :green_heart: | asflicense | 0m 45s | | The patch does not generate ASF License warnings. |
| | | 91m 14s | | |
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| GITHUB PR | https://github.com/apache/hadoop/pull/4438 |
| Optional Tests | dupname asflicense unit codespell detsecrets xmllint |
| uname | Linux 2672a54c0019 4.15.0-175-generic #184-Ubuntu SMP Thu Mar 24 17:48:36 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux |
| Build tool | maven |
| Personality | dev-support/bin/hadoop.sh |
| git revision | trunk / 30bf6edc6e886f5ec0c6bf24e62a0a5bce4e838a |
| Test Results | https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-4438/3/testReport/ |
| Max. process+thread count | 550 (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-4438/3/console |
| versions | git=2.25.1 maven=3.6.3 |
| Powered by | Apache Yetus 0.14.0 https://yetus.apache.org |
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