Java连接HBase超时解决方法

通过java连接hbase时，报出超时的错误，如下：

2017-09-13 20:25:01,882 [main] WARN  org.apache.hadoop.util.NativeCodeLoader - Unable to load native-hadoop library for your platform... using builtin-java classes where applicable

Exception in thread "main" org.apache.hadoop.hbase.client.RetriesExhaustedException: Failed after attempts=36, exceptions:

Wed Sep 13 20:25:56 CST 2017, null, java.net.SocketTimeoutException: callTimeout=60000, callDuration=72711: hadoop02 row 'myhbase,,' on table 'hbase:meta' at region=hbase:meta,,1.1588230740, hostname=hadoop02,16020,1505302260240, seqNum=0

    at org.apache.hadoop.hbase.client.RpcRetryingCallerWithReadReplicas.throwEnrichedException(RpcRetryingCallerWithReadReplicas.java:276)

    at org.apache.hadoop.hbase.client.ScannerCallableWithReplicas.call(ScannerCallableWithReplicas.java:210)

    at org.apache.hadoop.hbase.client.ScannerCallableWithReplicas.call(ScannerCallableWithReplicas.java:60)

    at org.apache.hadoop.hbase.client.RpcRetryingCaller.callWithoutRetries(RpcRetryingCaller.java:212)

    at org.apache.hadoop.hbase.client.ClientScanner.call(ClientScanner.java:314)

    at org.apache.hadoop.hbase.client.ClientScanner.nextScanner(ClientScanner.java:289)

    at org.apache.hadoop.hbase.client.ClientScanner.initializeScannerInConstruction(ClientScanner.java:164)

    at org.apache.hadoop.hbase.client.ClientScanner.<init>(ClientScanner.java:159)

    at org.apache.hadoop.hbase.client.HTable.getScanner(HTable.java:796)

    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:408)

    at myHbase.HbaseCreateTable.createTable(HbaseCreateTable.java:60)

    at myHbase.HbaseCreateTable.main(HbaseCreateTable.java:164)

Caused by: java.net.SocketTimeoutException: callTimeout=60000, callDuration=72711: hadoop02 row 'myhbase,,' on table 'hbase:meta' at region=hbase:meta,,1.1588230740, hostname=hadoop02,16020,1505302260240, seqNum=0

    at org.apache.hadoop.hbase.client.RpcRetryingCaller.callWithRetries(RpcRetryingCaller.java:171)

    at org.apache.hadoop.hbase.client.ResultBoundedCompletionService$QueueingFuture.run(ResultBoundedCompletionService.java:65)

    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)

    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)

    at java.lang.Thread.run(Thread.java:748)

Caused by: java.net.UnknownHostException: hadoop02

    at org.apache.hadoop.hbase.ipc.AbstractRpcClient$BlockingRpcChannelImplementation.<init>(AbstractRpcClient.java:315)

    at org.apache.hadoop.hbase.ipc.AbstractRpcClient.createBlockingRpcChannel(AbstractRpcClient.java:267)

    at org.apache.hadoop.hbase.client.ConnectionManager$HConnectionImplementation.getClient(ConnectionManager.java:1641)

    at org.apache.hadoop.hbase.client.ScannerCallable.prepare(ScannerCallable.java:163)

    at org.apache.hadoop.hbase.client.ScannerCallableWithReplicas$RetryingRPC.prepare(ScannerCallableWithReplicas.java:376)

    at org.apache.hadoop.hbase.client.RpcRetryingCaller.callWithRetries(RpcRetryingCaller.java:135)

    ... 4 more

Process finished with exit code 1

然后发现了这个错误：Caused by: java.net.UnknownHostException: hadoop02，主机名无法识别，解决办法是添加映射。在/etc/hosts 文件中添加映就ok了