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Posted to common-dev@hadoop.apache.org by "Amar Kamat (JIRA)" <ji...@apache.org> on 2008/03/13 07:43:46 UTC
[jira] Created: (HADOOP-3010) ConcurrentModificationException from
org.apache.hadoop.ipc.Server$Responder in JobTracker
ConcurrentModificationException from org.apache.hadoop.ipc.Server$Responder in JobTracker
-----------------------------------------------------------------------------------------
Key: HADOOP-3010
URL: https://issues.apache.org/jira/browse/HADOOP-3010
Project: Hadoop Core
Issue Type: Bug
Components: ipc
Reporter: Amar Kamat
I see lot of these in my JobTracker log
{noformat}
WARN org.apache.hadoop.ipc.Server: Exception in Responder java.util.ConcurrentModificationException
at java.util.HashMap$HashIterator.nextEntry(HashMap.java:793)
at java.util.HashMap$KeyIterator.next(HashMap.java:827)
at java.util.Collections$UnmodifiableCollection$1.next(Collections.java:1010)
at org.apache.hadoop.ipc.Server$Responder.run(Server.java:475)
{noformat}
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[jira] Updated: (HADOOP-3010) ConcurrentModificationException from
org.apache.hadoop.ipc.Server$Responder in JobTracker
Posted by "Raghu Angadi (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HADOOP-3010?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Raghu Angadi updated HADOOP-3010:
---------------------------------
Resolution: Fixed
Status: Resolved (was: Patch Available)
> ConcurrentModificationException from org.apache.hadoop.ipc.Server$Responder in JobTracker
> -----------------------------------------------------------------------------------------
>
> Key: HADOOP-3010
> URL: https://issues.apache.org/jira/browse/HADOOP-3010
> Project: Hadoop Core
> Issue Type: Bug
> Components: ipc
> Affects Versions: 0.16.1
> Reporter: Amar Kamat
> Assignee: Raghu Angadi
> Fix For: 0.17.0
>
> Attachments: HADOOP-3010.patch
>
>
> I see lot of these in my JobTracker log
> {noformat}
> WARN org.apache.hadoop.ipc.Server: Exception in Responder java.util.ConcurrentModificationException
> at java.util.HashMap$HashIterator.nextEntry(HashMap.java:793)
> at java.util.HashMap$KeyIterator.next(HashMap.java:827)
> at java.util.Collections$UnmodifiableCollection$1.next(Collections.java:1010)
> at org.apache.hadoop.ipc.Server$Responder.run(Server.java:475)
> {noformat}
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[jira] Commented: (HADOOP-3010) ConcurrentModificationException
from org.apache.hadoop.ipc.Server$Responder in JobTracker
Posted by "Raghu Angadi (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HADOOP-3010?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12584691#action_12584691 ]
Raghu Angadi commented on HADOOP-3010:
--------------------------------------
Could someone review this? Its a simple patch. Thanks.
> ConcurrentModificationException from org.apache.hadoop.ipc.Server$Responder in JobTracker
> -----------------------------------------------------------------------------------------
>
> Key: HADOOP-3010
> URL: https://issues.apache.org/jira/browse/HADOOP-3010
> Project: Hadoop Core
> Issue Type: Bug
> Components: ipc
> Affects Versions: 0.16.1
> Reporter: Amar Kamat
> Assignee: Raghu Angadi
> Fix For: 0.17.0
>
> Attachments: HADOOP-3010.patch
>
>
> I see lot of these in my JobTracker log
> {noformat}
> WARN org.apache.hadoop.ipc.Server: Exception in Responder java.util.ConcurrentModificationException
> at java.util.HashMap$HashIterator.nextEntry(HashMap.java:793)
> at java.util.HashMap$KeyIterator.next(HashMap.java:827)
> at java.util.Collections$UnmodifiableCollection$1.next(Collections.java:1010)
> at org.apache.hadoop.ipc.Server$Responder.run(Server.java:475)
> {noformat}
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[jira] Commented: (HADOOP-3010) ConcurrentModificationException
from org.apache.hadoop.ipc.Server$Responder in JobTracker
Posted by "Raghu Angadi (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HADOOP-3010?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12585216#action_12585216 ]
Raghu Angadi commented on HADOOP-3010:
--------------------------------------
I just commented this. Unit Test omission is explained in the 4th comment above.
> ConcurrentModificationException from org.apache.hadoop.ipc.Server$Responder in JobTracker
> -----------------------------------------------------------------------------------------
>
> Key: HADOOP-3010
> URL: https://issues.apache.org/jira/browse/HADOOP-3010
> Project: Hadoop Core
> Issue Type: Bug
> Components: ipc
> Affects Versions: 0.16.1
> Reporter: Amar Kamat
> Assignee: Raghu Angadi
> Fix For: 0.17.0
>
> Attachments: HADOOP-3010.patch
>
>
> I see lot of these in my JobTracker log
> {noformat}
> WARN org.apache.hadoop.ipc.Server: Exception in Responder java.util.ConcurrentModificationException
> at java.util.HashMap$HashIterator.nextEntry(HashMap.java:793)
> at java.util.HashMap$KeyIterator.next(HashMap.java:827)
> at java.util.Collections$UnmodifiableCollection$1.next(Collections.java:1010)
> at org.apache.hadoop.ipc.Server$Responder.run(Server.java:475)
> {noformat}
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[jira] Updated: (HADOOP-3010) ConcurrentModificationException from
org.apache.hadoop.ipc.Server$Responder in JobTracker
Posted by "Raghu Angadi (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HADOOP-3010?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Raghu Angadi updated HADOOP-3010:
---------------------------------
Hadoop Flags: [Reviewed]
Status: Patch Available (was: Open)
Thanks Dhruba.
> ConcurrentModificationException from org.apache.hadoop.ipc.Server$Responder in JobTracker
> -----------------------------------------------------------------------------------------
>
> Key: HADOOP-3010
> URL: https://issues.apache.org/jira/browse/HADOOP-3010
> Project: Hadoop Core
> Issue Type: Bug
> Components: ipc
> Affects Versions: 0.16.1
> Reporter: Amar Kamat
> Assignee: Raghu Angadi
> Fix For: 0.17.0
>
> Attachments: HADOOP-3010.patch
>
>
> I see lot of these in my JobTracker log
> {noformat}
> WARN org.apache.hadoop.ipc.Server: Exception in Responder java.util.ConcurrentModificationException
> at java.util.HashMap$HashIterator.nextEntry(HashMap.java:793)
> at java.util.HashMap$KeyIterator.next(HashMap.java:827)
> at java.util.Collections$UnmodifiableCollection$1.next(Collections.java:1010)
> at org.apache.hadoop.ipc.Server$Responder.run(Server.java:475)
> {noformat}
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[jira] Updated: (HADOOP-3010) ConcurrentModificationException from
org.apache.hadoop.ipc.Server$Responder in JobTracker
Posted by "Nigel Daley (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HADOOP-3010?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Nigel Daley updated HADOOP-3010:
--------------------------------
Fix Version/s: (was: 0.17.0)
0.16.3
> ConcurrentModificationException from org.apache.hadoop.ipc.Server$Responder in JobTracker
> -----------------------------------------------------------------------------------------
>
> Key: HADOOP-3010
> URL: https://issues.apache.org/jira/browse/HADOOP-3010
> Project: Hadoop Core
> Issue Type: Bug
> Components: ipc
> Affects Versions: 0.16.1
> Reporter: Amar Kamat
> Assignee: Raghu Angadi
> Fix For: 0.16.3
>
> Attachments: HADOOP-3010.patch
>
>
> I see lot of these in my JobTracker log
> {noformat}
> WARN org.apache.hadoop.ipc.Server: Exception in Responder java.util.ConcurrentModificationException
> at java.util.HashMap$HashIterator.nextEntry(HashMap.java:793)
> at java.util.HashMap$KeyIterator.next(HashMap.java:827)
> at java.util.Collections$UnmodifiableCollection$1.next(Collections.java:1010)
> at org.apache.hadoop.ipc.Server$Responder.run(Server.java:475)
> {noformat}
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[jira] Commented: (HADOOP-3010) ConcurrentModificationException
from org.apache.hadoop.ipc.Server$Responder in JobTracker
Posted by "Hadoop QA (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HADOOP-3010?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12585072#action_12585072 ]
Hadoop QA commented on HADOOP-3010:
-----------------------------------
-1 overall. Here are the results of testing the latest attachment
http://issues.apache.org/jira/secure/attachment/12379060/HADOOP-3010.patch
against trunk revision 643282.
@author +1. The patch does not contain any @author tags.
tests included -1. The patch doesn't appear to include any new or modified tests.
Please justify why no tests are needed for this patch.
javadoc +1. The javadoc tool did not generate any warning messages.
javac +1. The applied patch does not generate any new javac compiler warnings.
release audit +1. The applied patch does not generate any new release audit warnings.
findbugs +1. The patch does not introduce any new Findbugs warnings.
core tests +1. The patch passed core unit tests.
contrib tests +1. The patch passed contrib unit tests.
Test results: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/2137/testReport/
Findbugs warnings: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/2137/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Checkstyle results: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/2137/artifact/trunk/build/test/checkstyle-errors.html
Console output: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/2137/console
This message is automatically generated.
> ConcurrentModificationException from org.apache.hadoop.ipc.Server$Responder in JobTracker
> -----------------------------------------------------------------------------------------
>
> Key: HADOOP-3010
> URL: https://issues.apache.org/jira/browse/HADOOP-3010
> Project: Hadoop Core
> Issue Type: Bug
> Components: ipc
> Affects Versions: 0.16.1
> Reporter: Amar Kamat
> Assignee: Raghu Angadi
> Fix For: 0.17.0
>
> Attachments: HADOOP-3010.patch
>
>
> I see lot of these in my JobTracker log
> {noformat}
> WARN org.apache.hadoop.ipc.Server: Exception in Responder java.util.ConcurrentModificationException
> at java.util.HashMap$HashIterator.nextEntry(HashMap.java:793)
> at java.util.HashMap$KeyIterator.next(HashMap.java:827)
> at java.util.Collections$UnmodifiableCollection$1.next(Collections.java:1010)
> at org.apache.hadoop.ipc.Server$Responder.run(Server.java:475)
> {noformat}
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[jira] Commented: (HADOOP-3010) ConcurrentModificationException
from org.apache.hadoop.ipc.Server$Responder in JobTracker
Posted by "Hudson (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HADOOP-3010?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12585977#action_12585977 ]
Hudson commented on HADOOP-3010:
--------------------------------
Integrated in Hadoop-trunk #451 (See [http://hudson.zones.apache.org/hudson/job/Hadoop-trunk/451/])
> ConcurrentModificationException from org.apache.hadoop.ipc.Server$Responder in JobTracker
> -----------------------------------------------------------------------------------------
>
> Key: HADOOP-3010
> URL: https://issues.apache.org/jira/browse/HADOOP-3010
> Project: Hadoop Core
> Issue Type: Bug
> Components: ipc
> Affects Versions: 0.16.1
> Reporter: Amar Kamat
> Assignee: Raghu Angadi
> Fix For: 0.16.3
>
> Attachments: HADOOP-3010.patch
>
>
> I see lot of these in my JobTracker log
> {noformat}
> WARN org.apache.hadoop.ipc.Server: Exception in Responder java.util.ConcurrentModificationException
> at java.util.HashMap$HashIterator.nextEntry(HashMap.java:793)
> at java.util.HashMap$KeyIterator.next(HashMap.java:827)
> at java.util.Collections$UnmodifiableCollection$1.next(Collections.java:1010)
> at org.apache.hadoop.ipc.Server$Responder.run(Server.java:475)
> {noformat}
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[jira] Updated: (HADOOP-3010) ConcurrentModificationException from
org.apache.hadoop.ipc.Server$Responder in JobTracker
Posted by "Koji Noguchi (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HADOOP-3010?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Koji Noguchi updated HADOOP-3010:
---------------------------------
Affects Version/s: 0.16.1
As Nigel mentioned in HADOOP-3141, we are seeing this on namenode logs as well.
> ConcurrentModificationException from org.apache.hadoop.ipc.Server$Responder in JobTracker
> -----------------------------------------------------------------------------------------
>
> Key: HADOOP-3010
> URL: https://issues.apache.org/jira/browse/HADOOP-3010
> Project: Hadoop Core
> Issue Type: Bug
> Components: ipc
> Affects Versions: 0.16.1
> Reporter: Amar Kamat
>
> I see lot of these in my JobTracker log
> {noformat}
> WARN org.apache.hadoop.ipc.Server: Exception in Responder java.util.ConcurrentModificationException
> at java.util.HashMap$HashIterator.nextEntry(HashMap.java:793)
> at java.util.HashMap$KeyIterator.next(HashMap.java:827)
> at java.util.Collections$UnmodifiableCollection$1.next(Collections.java:1010)
> at org.apache.hadoop.ipc.Server$Responder.run(Server.java:475)
> {noformat}
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[jira] Assigned: (HADOOP-3010) ConcurrentModificationException from
org.apache.hadoop.ipc.Server$Responder in JobTracker
Posted by "Raghu Angadi (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HADOOP-3010?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Raghu Angadi reassigned HADOOP-3010:
------------------------------------
Assignee: Raghu Angadi
> ConcurrentModificationException from org.apache.hadoop.ipc.Server$Responder in JobTracker
> -----------------------------------------------------------------------------------------
>
> Key: HADOOP-3010
> URL: https://issues.apache.org/jira/browse/HADOOP-3010
> Project: Hadoop Core
> Issue Type: Bug
> Components: ipc
> Affects Versions: 0.16.1
> Reporter: Amar Kamat
> Assignee: Raghu Angadi
>
> I see lot of these in my JobTracker log
> {noformat}
> WARN org.apache.hadoop.ipc.Server: Exception in Responder java.util.ConcurrentModificationException
> at java.util.HashMap$HashIterator.nextEntry(HashMap.java:793)
> at java.util.HashMap$KeyIterator.next(HashMap.java:827)
> at java.util.Collections$UnmodifiableCollection$1.next(Collections.java:1010)
> at org.apache.hadoop.ipc.Server$Responder.run(Server.java:475)
> {noformat}
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[jira] Commented: (HADOOP-3010) ConcurrentModificationException
from org.apache.hadoop.ipc.Server$Responder in JobTracker
Posted by "dhruba borthakur (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HADOOP-3010?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12584934#action_12584934 ]
dhruba borthakur commented on HADOOP-3010:
------------------------------------------
+1. Code looks good.
> ConcurrentModificationException from org.apache.hadoop.ipc.Server$Responder in JobTracker
> -----------------------------------------------------------------------------------------
>
> Key: HADOOP-3010
> URL: https://issues.apache.org/jira/browse/HADOOP-3010
> Project: Hadoop Core
> Issue Type: Bug
> Components: ipc
> Affects Versions: 0.16.1
> Reporter: Amar Kamat
> Assignee: Raghu Angadi
> Fix For: 0.17.0
>
> Attachments: HADOOP-3010.patch
>
>
> I see lot of these in my JobTracker log
> {noformat}
> WARN org.apache.hadoop.ipc.Server: Exception in Responder java.util.ConcurrentModificationException
> at java.util.HashMap$HashIterator.nextEntry(HashMap.java:793)
> at java.util.HashMap$KeyIterator.next(HashMap.java:827)
> at java.util.Collections$UnmodifiableCollection$1.next(Collections.java:1010)
> at org.apache.hadoop.ipc.Server$Responder.run(Server.java:475)
> {noformat}
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[jira] Updated: (HADOOP-3010) ConcurrentModificationException from
org.apache.hadoop.ipc.Server$Responder in JobTracker
Posted by "Raghu Angadi (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HADOOP-3010?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Raghu Angadi updated HADOOP-3010:
---------------------------------
Fix Version/s: 0.17.0
Setting the earliest next release 0.17. If there is 0.16.3, this should go there too.
> ConcurrentModificationException from org.apache.hadoop.ipc.Server$Responder in JobTracker
> -----------------------------------------------------------------------------------------
>
> Key: HADOOP-3010
> URL: https://issues.apache.org/jira/browse/HADOOP-3010
> Project: Hadoop Core
> Issue Type: Bug
> Components: ipc
> Affects Versions: 0.16.1
> Reporter: Amar Kamat
> Assignee: Raghu Angadi
> Fix For: 0.17.0
>
>
> I see lot of these in my JobTracker log
> {noformat}
> WARN org.apache.hadoop.ipc.Server: Exception in Responder java.util.ConcurrentModificationException
> at java.util.HashMap$HashIterator.nextEntry(HashMap.java:793)
> at java.util.HashMap$KeyIterator.next(HashMap.java:827)
> at java.util.Collections$UnmodifiableCollection$1.next(Collections.java:1010)
> at org.apache.hadoop.ipc.Server$Responder.run(Server.java:475)
> {noformat}
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[jira] Updated: (HADOOP-3010) ConcurrentModificationException from
org.apache.hadoop.ipc.Server$Responder in JobTracker
Posted by "Raghu Angadi (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HADOOP-3010?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Raghu Angadi updated HADOOP-3010:
---------------------------------
Attachment: HADOOP-3010.patch
Patch attached. Server synchronizes on selector.keys() when it iterates over it once every few seconds. JavaDoc for Selector says we need to synchronize on these sets while accessing them. In this perticular case, IPC handler could enqueue more connections (thus modifying selector.keys()) while Responder iterates over them.
With some artificial sleeps I verified these exceptions show up before the patch and disappear after.
Regd unit test, I think this was straight forward incorrect access of an object and we are correcting it. I don't think this requires a unit test, as such it is not easy to trigger this reliably.
> ConcurrentModificationException from org.apache.hadoop.ipc.Server$Responder in JobTracker
> -----------------------------------------------------------------------------------------
>
> Key: HADOOP-3010
> URL: https://issues.apache.org/jira/browse/HADOOP-3010
> Project: Hadoop Core
> Issue Type: Bug
> Components: ipc
> Affects Versions: 0.16.1
> Reporter: Amar Kamat
> Assignee: Raghu Angadi
> Fix For: 0.17.0
>
> Attachments: HADOOP-3010.patch
>
>
> I see lot of these in my JobTracker log
> {noformat}
> WARN org.apache.hadoop.ipc.Server: Exception in Responder java.util.ConcurrentModificationException
> at java.util.HashMap$HashIterator.nextEntry(HashMap.java:793)
> at java.util.HashMap$KeyIterator.next(HashMap.java:827)
> at java.util.Collections$UnmodifiableCollection$1.next(Collections.java:1010)
> at org.apache.hadoop.ipc.Server$Responder.run(Server.java:475)
> {noformat}
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[jira] Commented: (HADOOP-3010) ConcurrentModificationException
from org.apache.hadoop.ipc.Server$Responder in JobTracker
Posted by "Nigel Daley (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HADOOP-3010?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12585752#action_12585752 ]
Nigel Daley commented on HADOOP-3010:
-------------------------------------
I just merged this to 0.16 branch.
> ConcurrentModificationException from org.apache.hadoop.ipc.Server$Responder in JobTracker
> -----------------------------------------------------------------------------------------
>
> Key: HADOOP-3010
> URL: https://issues.apache.org/jira/browse/HADOOP-3010
> Project: Hadoop Core
> Issue Type: Bug
> Components: ipc
> Affects Versions: 0.16.1
> Reporter: Amar Kamat
> Assignee: Raghu Angadi
> Fix For: 0.16.3
>
> Attachments: HADOOP-3010.patch
>
>
> I see lot of these in my JobTracker log
> {noformat}
> WARN org.apache.hadoop.ipc.Server: Exception in Responder java.util.ConcurrentModificationException
> at java.util.HashMap$HashIterator.nextEntry(HashMap.java:793)
> at java.util.HashMap$KeyIterator.next(HashMap.java:827)
> at java.util.Collections$UnmodifiableCollection$1.next(Collections.java:1010)
> at org.apache.hadoop.ipc.Server$Responder.run(Server.java:475)
> {noformat}
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[jira] Commented: (HADOOP-3010) ConcurrentModificationException
from org.apache.hadoop.ipc.Server$Responder in JobTracker
Posted by "Raghu Angadi (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HADOOP-3010?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12584005#action_12584005 ]
Raghu Angadi commented on HADOOP-3010:
--------------------------------------
I would recommend this for 0.16.3. The fact that it is currently not harmful is secondary, I think.
> ConcurrentModificationException from org.apache.hadoop.ipc.Server$Responder in JobTracker
> -----------------------------------------------------------------------------------------
>
> Key: HADOOP-3010
> URL: https://issues.apache.org/jira/browse/HADOOP-3010
> Project: Hadoop Core
> Issue Type: Bug
> Components: ipc
> Affects Versions: 0.16.1
> Reporter: Amar Kamat
>
> I see lot of these in my JobTracker log
> {noformat}
> WARN org.apache.hadoop.ipc.Server: Exception in Responder java.util.ConcurrentModificationException
> at java.util.HashMap$HashIterator.nextEntry(HashMap.java:793)
> at java.util.HashMap$KeyIterator.next(HashMap.java:827)
> at java.util.Collections$UnmodifiableCollection$1.next(Collections.java:1010)
> at org.apache.hadoop.ipc.Server$Responder.run(Server.java:475)
> {noformat}
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