使用数据订阅SDK订阅数据时，报类似如下错误。
failed to get master store addr for topic aliyun_sz_ecs_rdsr*y-1-0
订阅通道的消费时间点设置早于实际消费时间。
usePublicIp=true参数，确认不是这个问题后进行下一步排查。
注：数据订阅SDK配置
usePublicIp=true，表示SDK通过公网访问DTS订阅通道。
0 [Thread-1] INFO com.aliyun.drc.clusterclient.partition.PartitionPool - client partition is empty,wait partition balance
10035 [Thread-1] INFO com.aliyun.drc.clusterclient.partition.PartitionPool - client partition is empty,wait partition balance
20087 [Thread-1] INFO com.aliyun.drc.clusterclient.partition.PartitionPool - start new partition: {"tables":["sdp_db."],"topic":"aliyun_sz_ecs_rdsraey-1-0","guid":"dts_rdsraey_XNG","partition":{"name":"cb3999be97c2552477c2c298cb8339f1","gmt":1451272165},"offset":"16843009:1:188:21363830:[$Data]:511","group":"31137122"}
20229 [Thread-1] ERROR com.aliyun.drc.clusterclient.partition.PartitionPool - keep alive error
com.aliyun.drc.client.HttpBadResponseException: java.lang.Exception: failed to get master store addr for topic aliyun_sz_ecs_rds**ey-1-0
at com.aliyun.drc.client.impl.ServerProxy.askStore(ServerProxy.java:247)
at com.aliyun.drc.client.impl.ClusterManagers.findStore(ClusterManagers.java:105)
at com.aliyun.drc.client.impl.DRCClientImpl.connectClusterManager(DRCClientImpl.java:320)
at com.aliyun.drc.client.impl.DRCClientImpl.startService(DRCClientImpl.java:572)
at com.aliyun.drc.clusterclient.impl.ClientCluster.doStart(ClientCluster.java:128)
at com.aliyun.drc.clusterclient.partition.PartitionPool.keepAlive(PartitionPool.java:140)
at com.aliyun.drc.clusterclient.partition.PartitionPool.run(PartitionPool.java:168)
注："offset":"16843009:1:188:21363830:1451012406:511",中[$Data] 转换后是2015-12-25 11:00:06，此时间为消费时间点。
注：适用于数据订阅旧版。
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