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https://issues.apache.org/jira/browse/HBASE-22041?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17114447#comment-17114447
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Andrey Elenskiy commented on HBASE-22041:
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> Oh, I bet HDFS gets confused too... (but maybe not – IIRC, it creates' a name
> to use referring to the DN...) Let me check logs.
So for hadoop we route clients by hostnames (dfs.client.use.datanode.hostname)
and provision a k8s service per datanode which results in a stable IP per
datanode. That's a workaround to the bug
(https://issues.apache.org/jira/browse/HDFS-15250), which I don't think was
properly addressed there. Otherwise, we could have just relied on hostnames of
the pods without needing a service.
(During the pod restart, its hostname is also removed from DNS resulting in
UnresolvedHostnameException for clients).
The most ideal for hbase on k8s would be to not cache any IPs (stateless
connections) and not rely on hostnames (kinda like kafka brokers) but that's
probably not easy to change.
> [k8s] The crashed node exists in onlineServer forever, and if it holds the
> meta data, master will start up hang.
> ----------------------------------------------------------------------------------------------------------------
>
> Key: HBASE-22041
> URL: https://issues.apache.org/jira/browse/HBASE-22041
> Project: HBase
> Issue Type: Bug
> Reporter: lujie
> Priority: Critical
> Attachments: bug.zip, hbasemaster.log, normal.zip
>
>
> while master fresh boot, we crash (kill- 9) the RS who hold meta. we find
> that the master startup fails and print thounds of logs like:
> {code:java}
> 2019-03-13 01:09:54,896 WARN [RSProcedureDispatcher-pool4-t1]
> procedure.RSProcedureDispatcher: request to server
> hadoop14,16020,1552410583724 failed due to java.net.ConnectException: Call to
> hadoop14/172.16.1.131:16020 failed on connection exception:
> org.apache.hbase.thirdparty.io.netty.channel.AbstractChannel$AnnotatedConnectException:
> syscall:getsockopt(..) failed: Connection refused:
> hadoop14/172.16.1.131:16020, try=0, retrying...
> 2019-03-13 01:09:55,004 WARN [RSProcedureDispatcher-pool4-t2]
> procedure.RSProcedureDispatcher: request to server
> hadoop14,16020,1552410583724 failed due to
> org.apache.hadoop.hbase.ipc.FailedServerException: Call to
> hadoop14/172.16.1.131:16020 failed on local exception:
> org.apache.hadoop.hbase.ipc.FailedServerException: This server is in the
> failed servers list: hadoop14/172.16.1.131:16020, try=1, retrying...
> 2019-03-13 01:09:55,114 WARN [RSProcedureDispatcher-pool4-t3]
> procedure.RSProcedureDispatcher: request to server
> hadoop14,16020,1552410583724 failed due to
> org.apache.hadoop.hbase.ipc.FailedServerException: Call to
> hadoop14/172.16.1.131:16020 failed on local exception:
> org.apache.hadoop.hbase.ipc.FailedServerException: This server is in the
> failed servers list: hadoop14/172.16.1.131:16020, try=2, retrying...
> 2019-03-13 01:09:55,219 WARN [RSProcedureDispatcher-pool4-t4]
> procedure.RSProcedureDispatcher: request to server
> hadoop14,16020,1552410583724 failed due to
> org.apache.hadoop.hbase.ipc.FailedServerException: Call to
> hadoop14/172.16.1.131:16020 failed on local exception:
> org.apache.hadoop.hbase.ipc.FailedServerException: This server is in the
> failed servers list: hadoop14/172.16.1.131:16020, try=3, retrying...
> 2019-03-13 01:09:55,324 WARN [RSProcedureDispatcher-pool4-t5]
> procedure.RSProcedureDispatcher: request to server
> hadoop14,16020,1552410583724 failed due to
> org.apache.hadoop.hbase.ipc.FailedServerException: Call to
> hadoop14/172.16.1.131:16020 failed on local exception:
> org.apache.hadoop.hbase.ipc.FailedServerException: This server is in the
> failed servers list: hadoop14/172.16.1.131:16020, try=4, retrying...
> 2019-03-13 01:09:55,428 WARN [RSProcedureDispatcher-pool4-t6]
> procedure.RSProcedureDispatcher: request to server
> hadoop14,16020,1552410583724 failed due to
> org.apache.hadoop.hbase.ipc.FailedServerException: Call to
> hadoop14/172.16.1.131:16020 failed on local exception:
> org.apache.hadoop.hbase.ipc.FailedServerException: This server is in the
> failed servers list: hadoop14/172.16.1.131:16020, try=5, retrying...
> 2019-03-13 01:09:55,533 WARN [RSProcedureDispatcher-pool4-t7]
> procedure.RSProcedureDispatcher: request to server
> hadoop14,16020,1552410583724 failed due to
> org.apache.hadoop.hbase.ipc.FailedServerException: Call to
> hadoop14/172.16.1.131:16020 failed on local exception:
> org.apache.hadoop.hbase.ipc.FailedServerException: This server is in the
> failed servers list: hadoop14/172.16.1.131:16020, try=6, retrying...
> 2019-03-13 01:09:55,638 WARN [RSProcedureDispatcher-pool4-t8]
> procedure.RSProcedureDispatcher: request to server
> hadoop14,16020,1552410583724 failed due to
> org.apache.hadoop.hbase.ipc.FailedServerException: Call to
> hadoop14/172.16.1.131:16020 failed on local exception:
> org.apache.hadoop.hbase.ipc.FailedServerException: This server is in the
> failed servers list: hadoop14/172.16.1.131:16020, try=7, retrying...
> 2019-03-13 01:09:55,755 WARN [RSProcedureDispatcher-pool4-t9]
> procedure.RSProcedureDispatcher: request to server
> hadoop14,16020,1552410583724 failed due to
> org.apache.hadoop.hbase.ipc.FailedServerException: Call to
> hadoop14/172.16.1.131:16020 failed on local exception:
> org.apache.hadoop.hbase.ipc.FailedServerException: This server is in the
> failed servers list: hadoop14/172.16.1.131:16020, try=8, retrying...
> {code}
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