Elek, Marton created HDDS-776:
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Summary: Make OM initialization resilient to dns failures
Key: HDDS-776
URL: https://issues.apache.org/jira/browse/HDDS-776
Project: Hadoop Distributed Data Store
Issue Type: Improvement
Components: OM
Reporter: Elek, Marton
Ozone Manager could be initialized by 'ozone om --init' command and it connects
to a running scm.
In case of scm is unavailable because a dns issue the initialization is failed
without any retry:
{code}
2018-10-31 15:36:26 ERROR OzoneManager:376 - Could not initialize OM version
file
java.net.UnknownHostException: Invalid host name: local host is: (unknown);
destination host is: "releastest2-ozone-scm-0.releastest2-ozone-scm":9863;
java.net.UnknownHostException; For more details see:
http://wiki.apache.org/hadoop/UnknownHost
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at
sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at
sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
at org.apache.hadoop.net.NetUtils.wrapWithMessage(NetUtils.java:831)
at org.apache.hadoop.net.NetUtils.wrapException(NetUtils.java:768)
at org.apache.hadoop.ipc.Client$Connection.<init>(Client.java:449)
at org.apache.hadoop.ipc.Client.getConnection(Client.java:1552)
at org.apache.hadoop.ipc.Client.call(Client.java:1403)
at org.apache.hadoop.ipc.Client.call(Client.java:1367)
at
org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:228)
at
org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:116)
at com.sun.proxy.$Proxy9.getScmInfo(Unknown Source)
at
org.apache.hadoop.hdds.scm.protocolPB.ScmBlockLocationProtocolClientSideTranslatorPB.getScmInfo(ScmBlockLocationProtocolClientSideTranslatorPB.java:154)
at org.apache.hadoop.ozone.om.OzoneManager.omInit(OzoneManager.java:358)
at
org.apache.hadoop.ozone.om.OzoneManager.createOm(OzoneManager.java:326)
at org.apache.hadoop.ozone.om.OzoneManager.main(OzoneManager.java:265)
Caused by: java.net.UnknownHostException
at org.apache.hadoop.ipc.Client$Connection.<init>(Client.java:450)
... 10 more
{code}
This is a problem for all the containerized environments. In kubernetes om
can't be started sometimes. For docker-compose environments we have a 15 sec
sleep to be sure to avoid this issue.
Would be great to retry in case of a dns problem.
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