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Posted to common-issues@hadoop.apache.org by GitBox <gi...@apache.org> on 2022/05/19 11:16:10 UTC
[GitHub] [hadoop] sodonnel opened a new pull request, #4332: HDFS-16583. DatanodeAdminDefaultMonitor can get stuck in an infinite loop holding the write lock
sodonnel opened a new pull request, #4332:
URL: https://github.com/apache/hadoop/pull/4332
### Description of PR
Avoid concurrently modifying the `outOfServiceNodeBlocks` map in the DatanodeAdminDefaultMonitor when ending maintenance. The concurrentModification can cause the monitor to get stuck in an infinite loop in some circumstances, while holding the NN write lock.
The issue does not affect the DatanodeAdminBackoffMonitor, as it is implemented slightly differently.
More details in the Jira https://issues.apache.org/jira/browse/HDFS-16583
### How was this patch tested?
Existing tests should cover it.
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[GitHub] [hadoop] jojochuang commented on pull request #4332: HDFS-16583. DatanodeAdminDefaultMonitor can get stuck in an infinite loop holding the write lock
Posted by "jojochuang (via GitHub)" <gi...@apache.org>.
jojochuang commented on PR #4332:
URL: https://github.com/apache/hadoop/pull/4332#issuecomment-1581395454
@Kidd53685368 not sure i understand... could you elaborate a bit more? Does the PR not solve the issue, or does it cause regressions?
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[GitHub] [hadoop] Kidd53685368 commented on pull request #4332: HDFS-16583. DatanodeAdminDefaultMonitor can get stuck in an infinite loop holding the write lock
Posted by "Kidd53685368 (via GitHub)" <gi...@apache.org>.
Kidd53685368 commented on PR #4332:
URL: https://github.com/apache/hadoop/pull/4332#issuecomment-1580240331
It seems the problem won't keeping holding the writeLock because of the exceededNumBlocksPerCheck()?
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[GitHub] [hadoop] hadoop-yetus commented on pull request #4332: HDFS-16583. DatanodeAdminDefaultMonitor can get stuck in an infinite loop holding the write lock
Posted by GitBox <gi...@apache.org>.
hadoop-yetus commented on PR #4332:
URL: https://github.com/apache/hadoop/pull/4332#issuecomment-1132125495
:broken_heart: **-1 overall**
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[GitHub] [hadoop] sodonnel commented on pull request #4332: HDFS-16583. DatanodeAdminDefaultMonitor can get stuck in an infinite loop holding the write lock
Posted by GitBox <gi...@apache.org>.
sodonnel commented on PR #4332:
URL: https://github.com/apache/hadoop/pull/4332#issuecomment-1136926780
@jojochuang I don't think the test failure is related. Could you have another look and see if this change is good? Thanks!
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[GitHub] [hadoop] jojochuang merged pull request #4332: HDFS-16583. DatanodeAdminDefaultMonitor can get stuck in an infinite loop holding the write lock
Posted by GitBox <gi...@apache.org>.
jojochuang merged PR #4332:
URL: https://github.com/apache/hadoop/pull/4332
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[GitHub] [hadoop] hadoop-yetus commented on pull request #4332: HDFS-16583. DatanodeAdminDefaultMonitor can get stuck in an infinite loop holding the write lock
Posted by GitBox <gi...@apache.org>.
hadoop-yetus commented on PR #4332:
URL: https://github.com/apache/hadoop/pull/4332#issuecomment-1133217136
:broken_heart: **-1 overall**
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[GitHub] [hadoop] jojochuang commented on a diff in pull request #4332: HDFS-16583. DatanodeAdminDefaultMonitor can get stuck in an infinite loop holding the write lock
Posted by GitBox <gi...@apache.org>.
jojochuang commented on code in PR #4332:
URL: https://github.com/apache/hadoop/pull/4332#discussion_r877643028
##########
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/DatanodeAdminManager.java:
##########
@@ -255,6 +255,15 @@ public void startMaintenance(DatanodeDescriptor node,
*/
@VisibleForTesting
public void stopMaintenance(DatanodeDescriptor node) {
+ boolean shouldStopTracking = node.isMaintenance();
+ stopMaintenanceInternal(node);
+ if (shouldStopTracking) {
+ // Remove from tracking in DatanodeAdminManager
+ monitor.stopTrackingNode(node);
+ }
+ }
+
+ protected void stopMaintenanceInternal(DatanodeDescriptor node) {
Review Comment:
would be great to add comments or make the method name more self-explanatory.
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[GitHub] [hadoop] sodonnel commented on pull request #4332: HDFS-16583. DatanodeAdminDefaultMonitor can get stuck in an infinite loop holding the write lock
Posted by GitBox <gi...@apache.org>.
sodonnel commented on PR #4332:
URL: https://github.com/apache/hadoop/pull/4332#issuecomment-1133193488
Yea, the BackoffMonitor already used the cancelled nodes technique.
Initially, I tried to split the the stopMaintenance method, but then I realised there is a piace in the check loop where it yields the write lock, so someone could cancel a node and it would slip in while the lock is dropped, and could still cause the issue.
So I figured it was better to do the asynchronous cancel in the same way as the backOff monitor to fix it completely.
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[GitHub] [hadoop] hadoop-yetus commented on pull request #4332: HDFS-16583. DatanodeAdminDefaultMonitor can get stuck in an infinite loop holding the write lock
Posted by GitBox <gi...@apache.org>.
hadoop-yetus commented on PR #4332:
URL: https://github.com/apache/hadoop/pull/4332#issuecomment-1136461239
:broken_heart: **-1 overall**
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