[jira] [Created] (HBASE-16732) Avoid possible NPE in MetaTableLocator

["Jerry He (JIRA)" <ji...@apache.org>]

Jerry He created HBASE-16732:
--------------------------------

             Summary: Avoid possible NPE in MetaTableLocator
                 Key: HBASE-16732
                 URL: https://issues.apache.org/jira/browse/HBASE-16732
             Project: HBase
          Issue Type: Improvement
            Reporter: Jerry He
            Assignee: Jerry He
            Priority: Minor


{noformat}
java.lang.NullPointerException: null
        at org.apache.hadoop.hbase.zookeeper.ZooKeeperWatcher.getMetaReplicaNodes(ZooKeeperWatcher.java:489)
        at org.apache.hadoop.hbase.zookeeper.MetaTableLocator.blockUntilAvailable(MetaTableLocator.java:549)
        at org.apache.hadoop.hbase.client.ZooKeeperRegistry.getMetaRegionLocation(ZooKeeperRegistry.java:61)
        at org.apache.hadoop.hbase.client.ConnectionManager$HConnectionImplementation.locateMeta(ConnectionManager.java:1211)
        at org.apache.hadoop.hbase.client.ConnectionManager$HConnectionImplementation.locateRegion(ConnectionManager.java:1178)
        at org.apache.hadoop.hbase.client.RpcRetryingCallerWithReadReplicas.getRegionLocations(RpcRetryingCallerWithReadReplicas.java:305)
        at org.apache.hadoop.hbase.client.ScannerCallableWithReplicas.call(ScannerCallableWithReplicas.java:156)
        at org.apache.hadoop.hbase.client.ScannerCallableWithReplicas.call(ScannerCallableWithReplicas.java:60)
        at org.apache.hadoop.hbase.client.RpcRetryingCaller.callWithoutRetries(RpcRetryingCaller.java:200)
        at org.apache.hadoop.hbase.client.ClientScanner.call(ClientScanner.java:320)
        at org.apache.hadoop.hbase.client.ClientScanner.nextScanner(ClientScanner.java:295)
        at org.apache.hadoop.hbase.client.ClientScanner.initializeScannerInConstruction(ClientScanner.java:160)
        at org.apache.hadoop.hbase.client.ClientScanner.<init>(ClientScanner.java:155)
        at org.apache.hadoop.hbase.client.HTable.getScanner(HTable.java:804)
        at org.apache.hadoop.hbase.MetaTableAccessor.fullScan(MetaTableAccessor.java:602)
        at org.apache.hadoop.hbase.MetaTableAccessor.tableExists(MetaTableAccessor.java:366)
        at org.apache.hadoop.hbase.client.HBaseAdmin.tableExists(HBaseAdmin.java:396)
        at com.thinkaurelius.titan.diskstorage.hbase.HBaseAdmin1_2.clearTable(HBaseAdmin1_2.java:38)
        at com.thinkaurelius.titan.diskstorage.hbase.HBaseStoreManager.clearStorage(HBaseStoreManager.java:483)
{noformat}

It happens when hbase is not fully up, and the client comes in.



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