1）问题：JAVA api 远程hbase出错
org.apache.hadoop.hbase.client.RetriesExhaustedException: Failed after attempts=36, exceptions:
Tue Jul 19 16:36:05 CST 2016, null, java.net.SocketTimeoutException: callTimeout=60000, callDuration=79721: row 'testtable,,' on table 'hbase:meta' at region=hbase:meta,,1.1588230740, hostname=ubuntu,16020,1468916750524, seqNum=0
2）实验环境：windows10 eclipse下 Java API 远程hbase，其中hbase安装在虚拟环境下，采用NAT网络模式，hbase IP地址为192.168.137.25 。windows10 vmnet8 IP为192.168.137.1 双方都可以ping通，排除网络问题。
3）解决思路：首先 定位出错原因 ：Caused by: java.net.UnknownHostException: ubuntu 无法解析ubuntu主机名。
此处的 ubuntu 为hbase所在虚拟机的主机名。解析不到ubuntu主机对应的IP地址，
(1) 首先查看ubuntu主机下hosts信息
gedit /etc/hosts
127.0.0.1localhost
127.0.1.1 ubuntu
# The following lines are desirable for IPv6 capable hosts
::1 ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
(2) java 连接代码如下：
config = HBaseConfiguration.create();
config.set("hbase.zookeeper.quorum", "192.168.137.25");
config.set("hbase.zookeeper.property.clientPort", "2181");
config.set("hbase.master", "192.168.137.25:9001");
(3) 发现ubuntu对应的IP地址为127.0.1.1 ，添加192.168.137.25 ubuntu 并注释 127.0.1.1 ubuntu
#127.0.0.1localhost
#127.0.1.1 ubuntu
192.168.13725 ubuntu
(4) 其中在windows10 下修改 C:\Windows\System32\drivers\etc\hosts，添加
192.168.137.25 ubuntu
问题解决
原因：hbase会根据192.168.137.25 找到虚拟机主机，并且根据主机hosts文件解析IP127.0.0.1，这就造成了无法识别主机名。
4）详细错误：
org.apache.hadoop.hbase.client.RetriesExhaustedException: Failed after attempts=36, exceptions:
Tue Jul 19 16:36:05 CST 2016, null, java.net.SocketTimeoutException: callTimeout=60000, callDuration=79721: row 'testtable,,' on table 'hbase:meta' at region=hbase:meta,,1.1588230740, hostname=ubuntu,16020,1468916750524, seqNum=0
at org.apache.hadoop.hbase.client.RpcRetryingCallerWithReadReplicas.throwEnrichedException(RpcRetryingCallerWithReadReplicas.java:276)
at org.apache.hadoop.hbase.client.ScannerCallableWithReplicas.call(ScannerCallableWithReplicas.java:207)
at org.apache.hadoop.hbase.client.ScannerCallableWithReplicas.call(ScannerCallableWithReplicas.java:60)
at org.apache.hadoop.hbase.client.RpcRetryingCaller.callWithoutRetries(RpcRetryingCaller.java:210)
at org.apache.hadoop.hbase.client.ClientScanner.call(ClientScanner.java:326)
at org.apache.hadoop.hbase.client.ClientScanner.nextScanner(ClientScanner.java:301)
at org.apache.hadoop.hbase.client.ClientScanner.initializeScannerInConstruction(ClientScanner.java:166)
at org.apache.hadoop.hbase.client.ClientScanner.<init>(ClientScanner.java:161)
at org.apache.hadoop.hbase.client.HTable.getScanner(HTable.java:797)
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:406)
at upc.hbase.utils.HbaseTable.createTable(HbaseTable.java:46)
at upc.hbase.test.HbaseTestDemo.main(HbaseTestDemo.java:20)
Caused by: java.net.SocketTimeoutException: callTimeout=60000, callDuration=79721: row 'testtable,,' on table 'hbase:meta' at region=hbase:meta,,1.1588230740, hostname=ubuntu,16020,1468916750524, seqNum=0
at org.apache.hadoop.hbase.client.RpcRetryingCaller.callWithRetries(RpcRetryingCaller.java:169)
at org.apache.hadoop.hbase.client.ResultBoundedCompletionService$QueueingFuture.run(ResultBoundedCompletionService.java:65)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: java.net.UnknownHostException: ubuntu
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:1639)
at org.apache.hadoop.hbase.client.ScannerCallable.prepare(ScannerCallable.java:162)
at org.apache.hadoop.hbase.client.ScannerCallableWithReplicas$RetryingRPC.prepare(ScannerCallableWithReplicas.java:372)
at org.apache.hadoop.hbase.client.RpcRetryingCaller.callWithRetries(RpcRetryingCaller.java:134)
... 4 more