[jira] [Commented] (HBASE-6089) SSH and AM.joinCluster causes Concurrent Modification exception.
[ 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. -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa For more information on JIRA, see: http://www.atlassian.com/software/jira
[jira] [Commented] (HBASE-6089) SSH and AM.joinCluster causes Concurrent Modification exception.
[ 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. -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa For more information on JIRA, see: http://www.atlassian.com/software/jira
[jira] [Commented] (HBASE-6089) SSH and AM.joinCluster causes Concurrent Modification exception.
[ 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. -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa For more information on JIRA, see: http://www.atlassian.com/software/jira
[jira] [Commented] (HBASE-6089) SSH and AM.joinCluster causes Concurrent Modification exception.
[ 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. -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa For more information on JIRA, see: http://www.atlassian.com/software/jira
[jira] [Commented] (HBASE-6089) SSH and AM.joinCluster causes Concurrent Modification exception.
[ 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. -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa For more information on JIRA, see: http://www.atlassian.com/software/jira
[jira] [Commented] (HBASE-6089) SSH and AM.joinCluster causes Concurrent Modification exception.
[ 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. -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa For more information on JIRA, see: http://www.atlassian.com/software/jira
[jira] [Commented] (HBASE-6089) SSH and AM.joinCluster causes Concurrent Modification exception.
[ 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. -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa For more information on JIRA, see: http://www.atlassian.com/software/jira
[jira] [Commented] (HBASE-6089) SSH and AM.joinCluster causes Concurrent Modification exception.
[ 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. -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa For more information on JIRA, see: http://www.atlassian.com/software/jira
[jira] [Commented] (HBASE-6089) SSH and AM.joinCluster causes Concurrent Modification exception.
[ 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. -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa For more information on JIRA, see: http://www.atlassian.com/software/jira
[jira] [Commented] (HBASE-6089) SSH and AM.joinCluster causes Concurrent Modification exception.
[ 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. -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa For more information on JIRA, see: http://www.atlassian.com/software/jira
[jira] [Commented] (HBASE-6089) SSH and AM.joinCluster causes Concurrent Modification exception.
[ 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. -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa For more information on JIRA, see: http://www.atlassian.com/software/jira
[jira] [Commented] (HBASE-6089) SSH and AM.joinCluster causes Concurrent Modification exception.
[ 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. -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa For more information on JIRA, see: http://www.atlassian.com/software/jira
[jira] [Commented] (HBASE-6089) SSH and AM.joinCluster causes Concurrent Modification exception.
[ 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. -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa For more information on JIRA, see: http://www.atlassian.com/software/jira
[jira] [Commented] (HBASE-6089) SSH and AM.joinCluster causes Concurrent Modification exception.
[ 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. -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa For more information on JIRA, see: http://www.atlassian.com/software/jira
[jira] [Commented] (HBASE-6089) SSH and AM.joinCluster causes Concurrent Modification exception.
[ 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. -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa For more information on JIRA, see: http://www.atlassian.com/software/jira