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From "stack (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-537) We no longer wait on hdfs to exit safe mode
Date Fri, 21 Mar 2008 18:03:24 GMT

    [ https://issues.apache.org/jira/browse/HBASE-537?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12581147#action_12581147

stack commented on HBASE-537:

The regionservers already wait.  They do nothing until master tells them the hdfs to use.

If only master needs the wait facility, should be in master class? (Hadoop already exposes
tools for querying state of safemode)

> We no longer wait on hdfs to exit safe mode
> -------------------------------------------
>                 Key: HBASE-537
>                 URL: https://issues.apache.org/jira/browse/HBASE-537
>             Project: Hadoop HBase
>          Issue Type: Bug
>            Reporter: stack
> We used wait on hdfs to exit safe mode before going on to startup hbase but this feature
is broken since we moved out of hadoop contrib.  Now when you try start with hdfs in safe
mode you get:
> {code}
> 08/03/21 04:39:56 FATAL hbase.HMaster: Not starting HMaster because:
> org.apache.hadoop.ipc.RemoteException: org.apache.hadoop.dfs.SafeModeException: Cannot
create directory /hbase010. Name node is in safe mode.
> Safe mode will be turned off automatically.
>         at org.apache.hadoop.dfs.FSNamesystem.mkdirsInternal(FSNamesystem.java:1571)
>         at org.apache.hadoop.dfs.FSNamesystem.mkdirs(FSNamesystem.java:1559)
>         at org.apache.hadoop.dfs.NameNode.mkdirs(NameNode.java:422)
>         at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>         at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
>         at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
> {code}
> If you are lucky, it appears on STDOUT/ERR but may just be stuffed into logs and all
looks like its running properly.
> Noticed first by Lars George.

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