We have met following error:
12/12/10 12:17:57 INFO ipc.HBaseRPC: Server at xxxxx/172.22.245.48:60020 could not be reached after 1 tries, giving up.
12/12/10 12:17:59 INFO ipc.HBaseRPC: Server at xxxxx/172.22.245.48:60020 could not be reached after 1 tries, giving up.
12/12/10 12:18:01 INFO ipc.HBaseRPC: Server at xxxxx/172.22.245.48:60020 could not be reached after 1 tries, giving up.
12/12/10 12:18:03 INFO ipc.HBaseRPC: Server at xxxxx/172.22.245.48:60020 could not be reached after 1 tries, giving up.
12/12/10 12:18:06 INFO ipc.HBaseRPC: Server at xxxxx/172.22.245.48:60020 could not be reached after 1 tries, giving up.
12/12/10 12:18:09 INFO ipc.HBaseRPC: Server at xxxxx/172.22.245.48:60020 could not be reached after 1 tries, giving up.
12/12/10 12:18:14 INFO ipc.HBaseRPC: Server at xxxxx/172.22.245.48:60020 could not be reached after 1 tries, giving up.
ERROR: org.apache.hadoop.hbase.client.NoServerForRegionException: Unable to find region for stats,,99999999999999 after 7 tries.
In other words it means that region server is not reachable. There is closes information about reason why it's not accessible. When you look in HBase master status server should be listed in dead regions server:
Solution is to check connection to region server. When it's correct restart HBase.
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