[jira] [Commented] (HBASE-6089) SSH and AM.joinCluster causes Concurrent Modification exception.

2012-06-01 Thread Hudson (JIRA)

[ 
https://issues.apache.org/jira/browse/HBASE-6089?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanelfocusedCommentId=13287241#comment-13287241
 ] 

Hudson commented on HBASE-6089:
---

Integrated in HBase-0.92-security #109 (See 
[https://builds.apache.org/job/HBase-0.92-security/109/])
HBASE-6089 SSH and AM.joinCluster causes Concurrent Modification exception. 
(Rajesh) (Revision 1344803)

 Result = SUCCESS
ramkrishna : 
Files : 
* 
/hbase/branches/0.92/src/main/java/org/apache/hadoop/hbase/master/AssignmentManager.java


 SSH and AM.joinCluster causes Concurrent Modification exception.
 

 Key: HBASE-6089
 URL: https://issues.apache.org/jira/browse/HBASE-6089
 Project: HBase
  Issue Type: Bug
Affects Versions: 0.92.1, 0.94.0
Reporter: ramkrishna.s.vasudevan
Assignee: rajeshbabu
 Fix For: 0.90.7, 0.92.2, 0.96.0, 0.94.1

 Attachments: HBASE-6089_92.patch, HBASE-6089_94.patch, 
 HBASE-6089_trunk.patch


 AM.regions map is parallely accessed in SSH and Master initialization leading 
 to ConcurrentModificationException.

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[jira] [Commented] (HBASE-6089) SSH and AM.joinCluster causes Concurrent Modification exception.

2012-05-31 Thread Hudson (JIRA)

[ 
https://issues.apache.org/jira/browse/HBASE-6089?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanelfocusedCommentId=13286766#comment-13286766
 ] 

Hudson commented on HBASE-6089:
---

Integrated in HBase-0.94 #240 (See 
[https://builds.apache.org/job/HBase-0.94/240/])
HBASE-6089 SSH and AM.joinCluster causes Concurrent Modification exception. 
(Rajesh) (Revision 1344805)

 Result = SUCCESS
ramkrishna : 
Files : 
* 
/hbase/branches/0.94/src/main/java/org/apache/hadoop/hbase/master/AssignmentManager.java
* /hbase/branches/0.94/src/main/java/org/apache/hadoop/hbase/master/HMaster.java
* 
/hbase/branches/0.94/src/main/java/org/apache/hadoop/hbase/master/MasterFileSystem.java


 SSH and AM.joinCluster causes Concurrent Modification exception.
 

 Key: HBASE-6089
 URL: https://issues.apache.org/jira/browse/HBASE-6089
 Project: HBase
  Issue Type: Bug
Affects Versions: 0.92.1, 0.94.0
Reporter: ramkrishna.s.vasudevan
Assignee: rajeshbabu
 Fix For: 0.90.7, 0.92.2, 0.96.0, 0.94.1

 Attachments: HBASE-6089_92.patch, HBASE-6089_94.patch, 
 HBASE-6089_trunk.patch


 AM.regions map is parallely accessed in SSH and Master initialization leading 
 to ConcurrentModificationException.

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[jira] [Commented] (HBASE-6089) SSH and AM.joinCluster causes Concurrent Modification exception.

2012-05-31 Thread Hudson (JIRA)

[ 
https://issues.apache.org/jira/browse/HBASE-6089?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanelfocusedCommentId=13286820#comment-13286820
 ] 

Hudson commented on HBASE-6089:
---

Integrated in HBase-TRUNK #2967 (See 
[https://builds.apache.org/job/HBase-TRUNK/2967/])
HBASE-6089 SSH and AM.joinCluster causes Concurrent Modification exception. 
(Rajesh) (Revision 1344816)

 Result = FAILURE
ramkrishna : 
Files : 
* 
/hbase/trunk/hbase-server/src/main/java/org/apache/hadoop/hbase/master/AssignmentManager.java
* 
/hbase/trunk/hbase-server/src/main/java/org/apache/hadoop/hbase/master/HMaster.java
* 
/hbase/trunk/hbase-server/src/main/java/org/apache/hadoop/hbase/master/MasterFileSystem.java


 SSH and AM.joinCluster causes Concurrent Modification exception.
 

 Key: HBASE-6089
 URL: https://issues.apache.org/jira/browse/HBASE-6089
 Project: HBase
  Issue Type: Bug
Affects Versions: 0.92.1, 0.94.0
Reporter: ramkrishna.s.vasudevan
Assignee: rajeshbabu
 Fix For: 0.90.7, 0.92.2, 0.96.0, 0.94.1

 Attachments: HBASE-6089_92.patch, HBASE-6089_94.patch, 
 HBASE-6089_trunk.patch


 AM.regions map is parallely accessed in SSH and Master initialization leading 
 to ConcurrentModificationException.

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[jira] [Commented] (HBASE-6089) SSH and AM.joinCluster causes Concurrent Modification exception.

2012-05-31 Thread Hudson (JIRA)

[ 
https://issues.apache.org/jira/browse/HBASE-6089?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanelfocusedCommentId=13286845#comment-13286845
 ] 

Hudson commented on HBASE-6089:
---

Integrated in HBase-0.92 #439 (See 
[https://builds.apache.org/job/HBase-0.92/439/])
HBASE-6089 SSH and AM.joinCluster causes Concurrent Modification exception. 
(Rajesh) (Revision 1344803)

 Result = FAILURE
ramkrishna : 
Files : 
* 
/hbase/branches/0.92/src/main/java/org/apache/hadoop/hbase/master/AssignmentManager.java


 SSH and AM.joinCluster causes Concurrent Modification exception.
 

 Key: HBASE-6089
 URL: https://issues.apache.org/jira/browse/HBASE-6089
 Project: HBase
  Issue Type: Bug
Affects Versions: 0.92.1, 0.94.0
Reporter: ramkrishna.s.vasudevan
Assignee: rajeshbabu
 Fix For: 0.90.7, 0.92.2, 0.96.0, 0.94.1

 Attachments: HBASE-6089_92.patch, HBASE-6089_94.patch, 
 HBASE-6089_trunk.patch


 AM.regions map is parallely accessed in SSH and Master initialization leading 
 to ConcurrentModificationException.

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[jira] [Commented] (HBASE-6089) SSH and AM.joinCluster causes Concurrent Modification exception.

2012-05-31 Thread Hudson (JIRA)

[ 
https://issues.apache.org/jira/browse/HBASE-6089?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanelfocusedCommentId=13287038#comment-13287038
 ] 

Hudson commented on HBASE-6089:
---

Integrated in HBase-TRUNK-on-Hadoop-2.0.0 #35 (See 
[https://builds.apache.org/job/HBase-TRUNK-on-Hadoop-2.0.0/35/])
HBASE-6089 SSH and AM.joinCluster causes Concurrent Modification exception. 
(Rajesh) (Revision 1344816)

 Result = FAILURE
ramkrishna : 
Files : 
* 
/hbase/trunk/hbase-server/src/main/java/org/apache/hadoop/hbase/master/AssignmentManager.java
* 
/hbase/trunk/hbase-server/src/main/java/org/apache/hadoop/hbase/master/HMaster.java
* 
/hbase/trunk/hbase-server/src/main/java/org/apache/hadoop/hbase/master/MasterFileSystem.java


 SSH and AM.joinCluster causes Concurrent Modification exception.
 

 Key: HBASE-6089
 URL: https://issues.apache.org/jira/browse/HBASE-6089
 Project: HBase
  Issue Type: Bug
Affects Versions: 0.92.1, 0.94.0
Reporter: ramkrishna.s.vasudevan
Assignee: rajeshbabu
 Fix For: 0.90.7, 0.92.2, 0.96.0, 0.94.1

 Attachments: HBASE-6089_92.patch, HBASE-6089_94.patch, 
 HBASE-6089_trunk.patch


 AM.regions map is parallely accessed in SSH and Master initialization leading 
 to ConcurrentModificationException.

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[jira] [Commented] (HBASE-6089) SSH and AM.joinCluster causes Concurrent Modification exception.

2012-05-31 Thread Hudson (JIRA)

[ 
https://issues.apache.org/jira/browse/HBASE-6089?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanelfocusedCommentId=13287166#comment-13287166
 ] 

Hudson commented on HBASE-6089:
---

Integrated in HBase-0.94-security #33 (See 
[https://builds.apache.org/job/HBase-0.94-security/33/])
HBASE-6089 SSH and AM.joinCluster causes Concurrent Modification exception. 
(Rajesh) (Revision 1344805)

 Result = FAILURE
ramkrishna : 
Files : 
* 
/hbase/branches/0.94/src/main/java/org/apache/hadoop/hbase/master/AssignmentManager.java
* /hbase/branches/0.94/src/main/java/org/apache/hadoop/hbase/master/HMaster.java
* 
/hbase/branches/0.94/src/main/java/org/apache/hadoop/hbase/master/MasterFileSystem.java


 SSH and AM.joinCluster causes Concurrent Modification exception.
 

 Key: HBASE-6089
 URL: https://issues.apache.org/jira/browse/HBASE-6089
 Project: HBase
  Issue Type: Bug
Affects Versions: 0.92.1, 0.94.0
Reporter: ramkrishna.s.vasudevan
Assignee: rajeshbabu
 Fix For: 0.90.7, 0.92.2, 0.96.0, 0.94.1

 Attachments: HBASE-6089_92.patch, HBASE-6089_94.patch, 
 HBASE-6089_trunk.patch


 AM.regions map is parallely accessed in SSH and Master initialization leading 
 to ConcurrentModificationException.

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[jira] [Commented] (HBASE-6089) SSH and AM.joinCluster causes Concurrent Modification exception.

2012-05-30 Thread Anoop Sam John (JIRA)

[ 
https://issues.apache.org/jira/browse/HBASE-6089?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanelfocusedCommentId=13285421#comment-13285421
 ] 

Anoop Sam John commented on HBASE-6089:
---

{quote}
So you suggest to change both the data structures this.servers and this.regions 
to concurrentskiplistmap
{quote}
As per the current code written don't think we can change Ram.
We need a block of code to be sync which deals with both regions and servers 
data structures. Also some other blocks where more than one operation on the 
regions are being in sync block.  Changing the data structure to 
concurrentskiplistmap will not give this behaviour right.




 SSH and AM.joinCluster causes Concurrent Modification exception.
 

 Key: HBASE-6089
 URL: https://issues.apache.org/jira/browse/HBASE-6089
 Project: HBase
  Issue Type: Bug
Affects Versions: 0.92.1, 0.94.0
Reporter: ramkrishna.s.vasudevan
Assignee: rajeshbabu
 Fix For: 0.90.7, 0.92.2, 0.96.0, 0.94.1

 Attachments: HBASE-6089_92.patch, HBASE-6089_94.patch, 
 HBASE-6089_trunk.patch


 AM.regions map is parallely accessed in SSH and Master initialization leading 
 to ConcurrentModificationException.

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[jira] [Commented] (HBASE-6089) SSH and AM.joinCluster causes Concurrent Modification exception.

2012-05-30 Thread ramkrishna.s.vasudevan (JIRA)

[ 
https://issues.apache.org/jira/browse/HBASE-6089?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanelfocusedCommentId=13285425#comment-13285425
 ] 

ramkrishna.s.vasudevan commented on HBASE-6089:
---

Yes.  As per the javadoc for entrySet in ConcurrentSkipListMap
{code}
 * pThe view's ttiterator/tt is a weakly consistent iterator
 * that will never throw {@link ConcurrentModificationException},
 * and guarantees to traverse elements as they existed upon
 * construction of the iterator, and may (but is not guaranteed to)
 * reflect any modifications subsequent to construction.
{code}

So as per the current JIRA when we iterate the this.region in joincluster we 
need to get the actual regions there.  If SSH tries to modify we may even try 
to iterate those regions.
So making it to ConcurrentSkipListMap will not help us here and still we need 
to go with the sync block.
So i think the current patch should be fine.
@Stack
What you feel? If it is ok for you , i can commit this?

 SSH and AM.joinCluster causes Concurrent Modification exception.
 

 Key: HBASE-6089
 URL: https://issues.apache.org/jira/browse/HBASE-6089
 Project: HBase
  Issue Type: Bug
Affects Versions: 0.92.1, 0.94.0
Reporter: ramkrishna.s.vasudevan
Assignee: rajeshbabu
 Fix For: 0.90.7, 0.92.2, 0.96.0, 0.94.1

 Attachments: HBASE-6089_92.patch, HBASE-6089_94.patch, 
 HBASE-6089_trunk.patch


 AM.regions map is parallely accessed in SSH and Master initialization leading 
 to ConcurrentModificationException.

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[jira] [Commented] (HBASE-6089) SSH and AM.joinCluster causes Concurrent Modification exception.

2012-05-30 Thread ramkrishna.s.vasudevan (JIRA)

[ 
https://issues.apache.org/jira/browse/HBASE-6089?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanelfocusedCommentId=13285541#comment-13285541
 ] 

ramkrishna.s.vasudevan commented on HBASE-6089:
---

Thinking again on this, there are some places where we wait for the 
this.regions to be populated.
{code}
{code}

 SSH and AM.joinCluster causes Concurrent Modification exception.
 

 Key: HBASE-6089
 URL: https://issues.apache.org/jira/browse/HBASE-6089
 Project: HBase
  Issue Type: Bug
Affects Versions: 0.92.1, 0.94.0
Reporter: ramkrishna.s.vasudevan
Assignee: rajeshbabu
 Fix For: 0.90.7, 0.92.2, 0.96.0, 0.94.1

 Attachments: HBASE-6089_92.patch, HBASE-6089_94.patch, 
 HBASE-6089_trunk.patch


 AM.regions map is parallely accessed in SSH and Master initialization leading 
 to ConcurrentModificationException.

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[jira] [Commented] (HBASE-6089) SSH and AM.joinCluster causes Concurrent Modification exception.

2012-05-30 Thread stack (JIRA)

[ 
https://issues.apache.org/jira/browse/HBASE-6089?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanelfocusedCommentId=13285863#comment-13285863
 ] 

stack commented on HBASE-6089:
--

bq. What you feel? If it is ok for you , i can commit this?

Yes.  Its no good adding a CSLM as I suggested because the sync block is needed 
to cover regions and servers updates (as Anoop says).

 SSH and AM.joinCluster causes Concurrent Modification exception.
 

 Key: HBASE-6089
 URL: https://issues.apache.org/jira/browse/HBASE-6089
 Project: HBase
  Issue Type: Bug
Affects Versions: 0.92.1, 0.94.0
Reporter: ramkrishna.s.vasudevan
Assignee: rajeshbabu
 Fix For: 0.90.7, 0.92.2, 0.96.0, 0.94.1

 Attachments: HBASE-6089_92.patch, HBASE-6089_94.patch, 
 HBASE-6089_trunk.patch


 AM.regions map is parallely accessed in SSH and Master initialization leading 
 to ConcurrentModificationException.

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[jira] [Commented] (HBASE-6089) SSH and AM.joinCluster causes Concurrent Modification exception.

2012-05-29 Thread rajeshbabu (JIRA)

[ 
https://issues.apache.org/jira/browse/HBASE-6089?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanelfocusedCommentId=13284877#comment-13284877
 ] 

rajeshbabu commented on HBASE-6089:
---

In 94 and trunk patches,along with fix,removed params in javadoc of modified 
methods as part of HBASE-5916 and dead code in AssignmentManager.
{code}
void unassignCatalogRegions(){
this.servers.entrySet();
{code}




 SSH and AM.joinCluster causes Concurrent Modification exception.
 

 Key: HBASE-6089
 URL: https://issues.apache.org/jira/browse/HBASE-6089
 Project: HBase
  Issue Type: Bug
Affects Versions: 0.92.1, 0.94.0
Reporter: ramkrishna.s.vasudevan
Assignee: rajeshbabu
 Fix For: 0.90.7, 0.92.2, 0.96.0, 0.94.1

 Attachments: HBASE-6089_92.patch, HBASE-6089_94.patch, 
 HBASE-6089_trunk.patch


 AM.regions map is parallely accessed in SSH and Master initialization leading 
 to ConcurrentModificationException.

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[jira] [Commented] (HBASE-6089) SSH and AM.joinCluster causes Concurrent Modification exception.

2012-05-29 Thread Zhihong Yu (JIRA)

[ 
https://issues.apache.org/jira/browse/HBASE-6089?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanelfocusedCommentId=13284895#comment-13284895
 ] 

Zhihong Yu commented on HBASE-6089:
---

Pstch for trunk looks good.

 SSH and AM.joinCluster causes Concurrent Modification exception.
 

 Key: HBASE-6089
 URL: https://issues.apache.org/jira/browse/HBASE-6089
 Project: HBase
  Issue Type: Bug
Affects Versions: 0.92.1, 0.94.0
Reporter: ramkrishna.s.vasudevan
Assignee: rajeshbabu
 Fix For: 0.90.7, 0.92.2, 0.96.0, 0.94.1

 Attachments: HBASE-6089_92.patch, HBASE-6089_94.patch, 
 HBASE-6089_trunk.patch


 AM.regions map is parallely accessed in SSH and Master initialization leading 
 to ConcurrentModificationException.

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[jira] [Commented] (HBASE-6089) SSH and AM.joinCluster causes Concurrent Modification exception.

2012-05-29 Thread stack (JIRA)

[ 
https://issues.apache.org/jira/browse/HBASE-6089?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanelfocusedCommentId=13284973#comment-13284973
 ] 

stack commented on HBASE-6089:
--

Patch looks good to me.

Rather than synchronize, why not use a concurrentskiplistmap?  Also, for sure 
we have synchronized all accesses to this.region.  What about its tie to 
this.servers.  That is still respected by this patch?

 SSH and AM.joinCluster causes Concurrent Modification exception.
 

 Key: HBASE-6089
 URL: https://issues.apache.org/jira/browse/HBASE-6089
 Project: HBase
  Issue Type: Bug
Affects Versions: 0.92.1, 0.94.0
Reporter: ramkrishna.s.vasudevan
Assignee: rajeshbabu
 Fix For: 0.90.7, 0.92.2, 0.96.0, 0.94.1

 Attachments: HBASE-6089_92.patch, HBASE-6089_94.patch, 
 HBASE-6089_trunk.patch


 AM.regions map is parallely accessed in SSH and Master initialization leading 
 to ConcurrentModificationException.

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[jira] [Commented] (HBASE-6089) SSH and AM.joinCluster causes Concurrent Modification exception.

2012-05-29 Thread ramkrishna.s.vasudevan (JIRA)

[ 
https://issues.apache.org/jira/browse/HBASE-6089?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanelfocusedCommentId=13285395#comment-13285395
 ] 

ramkrishna.s.vasudevan commented on HBASE-6089:
---

bq.What about its tie to this.servers. That is still respected by this patch?
This we have checked it and the patch still holds good w.r.t to the tie up with 
this.servers.
bq.Rather than synchronize, why not use a concurrentskiplistmap?
So you suggest to change both the data structures this.servers and this.regions 
to concurrentskiplistmap thro out the code, by removing the synchronized blocks?

 SSH and AM.joinCluster causes Concurrent Modification exception.
 

 Key: HBASE-6089
 URL: https://issues.apache.org/jira/browse/HBASE-6089
 Project: HBase
  Issue Type: Bug
Affects Versions: 0.92.1, 0.94.0
Reporter: ramkrishna.s.vasudevan
Assignee: rajeshbabu
 Fix For: 0.90.7, 0.92.2, 0.96.0, 0.94.1

 Attachments: HBASE-6089_92.patch, HBASE-6089_94.patch, 
 HBASE-6089_trunk.patch


 AM.regions map is parallely accessed in SSH and Master initialization leading 
 to ConcurrentModificationException.

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[jira] [Commented] (HBASE-6089) SSH and AM.joinCluster causes Concurrent Modification exception.

2012-05-24 Thread ramkrishna.s.vasudevan (JIRA)

[ 
https://issues.apache.org/jira/browse/HBASE-6089?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanelfocusedCommentId=13282582#comment-13282582
 ] 

ramkrishna.s.vasudevan commented on HBASE-6089:
---

{code}
2012-05-24 19:26:02,493 DEBUG org.apache.hadoop.hbase.master.ServerManager: New 
connection to linux146,60020,1337867810895
2012-05-24 19:26:02,552 DEBUG org.apache.hadoop.hbase.master.AssignmentManager: 
Handling transition=RS_ZK_REGION_OPENING, server=linux146,60020,1337867810895, 
region=2be5ef20db58b775953cc1107eb51d2d
2012-05-24 19:26:02,592 DEBUG org.apache.hadoop.hbase.master.AssignmentManager: 
Handling transition=RS_ZK_REGION_OPENING, server=linux146,60020,1337867810895, 
region=191b0c97f2d2a8262bf790093fdce2ab
2012-05-24 19:26:02,595 DEBUG org.apache.hadoop.hbase.master.AssignmentManager: 
Handling transition=RS_ZK_REGION_OPENING, server=linux146,60020,1337867810895, 
region=99d462b47ea5e301175d025204eff014
2012-05-24 19:26:03,957 DEBUG org.apache.hadoop.hbase.master.AssignmentManager: 
Bulk assigning done for linux146,60020,1337867810895
2012-05-24 19:26:14,640 DEBUG org.apache.hadoop.hbase.master.AssignmentManager: 
Handling transition=RS_ZK_REGION_OPENING, server=linux146,60020,1337867810895, 
region=2be5ef20db58b775953cc1107eb51d2d
2012-05-24 19:26:14,781 DEBUG org.apache.hadoop.hbase.master.AssignmentManager: 
Handling transition=RS_ZK_REGION_OPENED, server=linux146,60020,1337867810895, 
region=2be5ef20db58b775953cc1107eb51d2d
2012-05-24 19:26:14,785 DEBUG 
org.apache.hadoop.hbase.master.handler.OpenedRegionHandler: Handling OPENED 
event for et1,,1337864575331.2be5ef20db58b775953cc1107eb51d2d. from 
linux146,60020,1337867810895; deleting unassigned node
2012-05-24 19:26:14,786 DEBUG org.apache.hadoop.hbase.zookeeper.ZKAssign: 
master:6-0x1377ea1a1fe002d Deleting existing unassigned node for 
2be5ef20db58b775953cc1107eb51d2d that is in expected state RS_ZK_REGION_OPENED
2012-05-24 19:26:14,792 DEBUG org.apache.hadoop.hbase.zookeeper.ZKAssign: 
master:6-0x1377ea1a1fe002d Successfully deleted unassigned node for region 
2be5ef20db58b775953cc1107eb51d2d in expected state RS_ZK_REGION_OPENED
2012-05-24 19:26:14,792 DEBUG org.apache.hadoop.hbase.master.AssignmentManager: 
Handling transition=RS_ZK_REGION_OPENING, server=linux146,60020,1337867810895, 
region=5a84a4f4eaf2519e36a8ccc2e9c83b04
2012-05-24 19:26:14,792 DEBUG org.apache.hadoop.hbase.master.AssignmentManager: 
The znode of region et1,,1337864575331.2be5ef20db58b775953cc1107eb51d2d. has 
been deleted.
2012-05-24 19:26:23,862 INFO 
org.apache.hadoop.hbase.master.handler.ServerShutdownHandler: Finished 
processing of shutdown of linux146,60020,1337866620614
2012-05-24 19:26:51,927 FATAL org.apache.hadoop.hbase.master.HMaster: Master 
server abort: loaded coprocessors are: []
2012-05-24 19:26:51,931 FATAL org.apache.hadoop.hbase.master.HMaster: Unhandled 
exception. Starting shutdown.
java.util.ConcurrentModificationException
at java.util.TreeMap$PrivateEntryIterator.nextEntry(TreeMap.java:1100)
at java.util.TreeMap$EntryIterator.next(TreeMap.java:1136)
at java.util.TreeMap$EntryIterator.next(TreeMap.java:1131)
at 
org.apache.hadoop.hbase.master.AssignmentManager.processDeadServersAndRegionsInTransition(AssignmentManager.java:409)
at 
org.apache.hadoop.hbase.master.AssignmentManager.joinCluster(AssignmentManager.java:363)
at 
org.apache.hadoop.hbase.master.HMaster.finishInitialization(HMaster.java:607)
at org.apache.hadoop.hbase.master.HMaster.run(HMaster.java:374)
at java.lang.Thread.run(Thread.java:662)
{code}


 SSH and AM.joinCluster causes Concurrent Modification exception.
 

 Key: HBASE-6089
 URL: https://issues.apache.org/jira/browse/HBASE-6089
 Project: HBase
  Issue Type: Bug
Affects Versions: 0.92.1, 0.94.0
Reporter: ramkrishna.s.vasudevan
 Fix For: 0.90.7, 0.92.2, 0.96.0, 0.94.1


 AM.regions map is parallely accessed in SSH and Master initialization leading 
 to ConcurrentModificationException.

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