Hi list, Last weekend I got a region server crashed, but some regions never got online again on other RSes. I've gone through the logs, and here is the timeline about some of the events:
* 13:03:50 on of the region server, rs-node7, died because of a disk failure. Master started to split rs-node7's WALs 2016-04-30 13:03:50,953 INFO org.apache.hadoop.hbase.master.handler.ServerShutdownHandler: Splitting logs for rs-node7.example.com,60020,1458724695128 before assignment; region count=133 2016-04-30 13:03:50,966 DEBUG org.apache.hadoop.hbase.master.SplitLogManager: Scheduling batch of logs to split 2016-04-30 13:03:50,966 INFO org.apache.hadoop.hbase.master.SplitLogManager: started splitting 33 logs in [hdfs://nameservice1/hbase/WALs/rs-node7.example.com,60020,1458724695128-splitting] for [rs-node7.example.com,60020,1458724695128] * 13:10:47 WAL splits done, master began to re-assign regions 2016-04-30 13:10:47,655 INFO org.apache.hadoop.hbase.master.handler.ServerShutdownHandler: Reassigning 133 region(s) that rs-node7.example.com,60020,1458724695128 was carrying (and 0 regions(s) that were opening on this server) 2016-04-30 13:10:47,665 INFO org.apache.hadoop.hbase.master.AssignmentManager: Bulk assigning 133 region(s) across 6 server(s), round-robin=true 2016-04-30 13:10:47,667 INFO org.apache.hadoop.hbase.master.AssignmentManager: Assigning 22 region(s) to rs-node1.example.com,60020,1458720625688 2016-04-30 13:10:47,667 INFO org.apache.hadoop.hbase.master.AssignmentManager: Assigning 22 region(s) to rs-node2.example.com,60020,1458721110988 2016-04-30 13:10:47,667 INFO org.apache.hadoop.hbase.master.AssignmentManager: Assigning 22 region(s) to rs-node3.example.com,60020,1458721713906 2016-04-30 13:10:47,679 INFO org.apache.hadoop.hbase.master.AssignmentManager: Assigning 23 region(s) to rs-node4.example.com,60020,1458722335527 2016-04-30 13:10:47,691 INFO org.apache.hadoop.hbase.master.AssignmentManager: Assigning 22 region(s) to rs-node5.example.com,60020,1458722992296 2016-04-30 13:10:47,702 INFO org.apache.hadoop.hbase.master.AssignmentManager: Assigning 22 region(s) to rs-node6.example.com,60020,1458723856883 * 13:11:47 the opening regions rpc sent by master to region servers timed out after 1 minutes 2016-04-30 13:11:47,780 INFO org.apache.hadoop.hbase.master.AssignmentManager: Unable to communicate with rs-node3.example.com,60020,1458721713906 in order to assign regions java.io.IOException: Call to rs-node3.example.com/172.16.6.3:60020 failed on local exception: org.apache.hadoop.hbase.ipc.CallTimeoutException: Call id=4, waitTime=60001, operationTimeout=60000 expired. 2016-04-30 13:11:47,782 INFO org.apache.hadoop.hbase.master.GeneralBulkAssigner: Failed assigning 22 regions to server rs-node6.example.com,60020,1458723856883, reassigning them 2016-04-30 13:11:47,782 INFO org.apache.hadoop.hbase.master.GeneralBulkAssigner: Failed assigning 23 regions to server rs-node4.example.com,60020,1458722335527, reassigning them 2016-04-30 13:11:47,782 INFO org.apache.hadoop.hbase.master.GeneralBulkAssigner: Failed assigning 22 regions to server rs-node3.example.com,60020,1458721713906, reassigning them 2016-04-30 13:11:47,783 DEBUG org.apache.hadoop.hbase.master.AssignmentManager: Force region state offline {a65660e421f114e93862194f7cc35644 state=OPENING, ts=1462021907753, server=rs-node6.example.com,60020,1458723856883} * After that, part of the regions (40 out of 130 regions) never got online, and the following lines were logged repeatly in master log: 2016-04-30 13:12:37,188 DEBUG org.apache.hadoop.hbase.master.AssignmentManager: update {d1c7f3f455f2529da82a2f713b5ee067 state=PENDING_OPEN, ts=1462021957087, server=rs-node6.example.com,60020,1458723856883} the timestamp. 2016-04-30 13:12:37,188 DEBUG org.apache.hadoop.hbase.master.AssignmentManager: Region is already in transition; waiting up to 10668ms $ grep 'AssignmentManager: update {d1c7f3f455f2529da82a2f713b5ee067' /var/log/hbase/hbase-cmf-hbase-MASTER-head.example.com.log.out.1|wc -l 484 I've searched in mailing list archive and hbase JIRA, but didn't find any similar situations like this one. The most similar one is HBASE-14407 <https://issues.apache.org/jira/browse/HBASE-14407> , but after reading its discussion I don't think that's the same problem. Anyone have a clue? Thanks! Regards, Shuai