NPE in EventHandler when region already reassigned --------------------------------------------------
Key: HBASE-3627 URL: https://issues.apache.org/jira/browse/HBASE-3627 Project: HBase Issue Type: Bug Affects Versions: 0.90.1 Reporter: Jean-Daniel Cryans Priority: Critical Fix For: 0.90.2 When a region takes too long to open, it will try to update the unassigned znode and will fail on an ugly NPE like this: {quote} DEBUG org.apache.hadoop.hbase.zookeeper.ZKAssign: regionserver:60020-0x22dc571dde04ca7 Attempting to transition node 0519dc3b62a569347526875048c37faa from RS_ZK_REGION_OPENING to RS_ZK_REGION_OPENING DEBUG org.apache.hadoop.hbase.zookeeper.ZKUtil: regionserver:60020-0x22dc571dde04ca7 Unable to get data of znode /hbase/unassigned/0519dc3b62a569347526875048c37faa because node does not exist (not necessarily an error) ERROR org.apache.hadoop.hbase.executor.EventHandler: Caught throwable while processing event M_RS_OPEN_REGION java.lang.NullPointerException at org.apache.hadoop.hbase.util.Writables.getWritable(Writables.java:75) at org.apache.hadoop.hbase.executor.RegionTransitionData.fromBytes(RegionTransitionData.java:198) at org.apache.hadoop.hbase.zookeeper.ZKAssign.transitionNode(ZKAssign.java:672) at org.apache.hadoop.hbase.zookeeper.ZKAssign.retransitionNodeOpening(ZKAssign.java:585) at org.apache.hadoop.hbase.regionserver.handler.OpenRegionHandler.tickleOpening(OpenRegionHandler.java:322) at org.apache.hadoop.hbase.regionserver.handler.OpenRegionHandler.process(OpenRegionHandler.java:97) at org.apache.hadoop.hbase.executor.EventHandler.run(EventHandler.java:151) at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) {quote} I think the region server in this case should be closing the region ASAP. -- This message is automatically generated by JIRA. For more information on JIRA, see: http://www.atlassian.com/software/jira