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https://issues.apache.org/jira/browse/HDFS-6956?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14148606#comment-14148606
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Colin Patrick McCabe commented on HDFS-6956:
--------------------------------------------

The "new" findbugs bug text is this:
{code}
Class 
org.apache.hadoop.hdfs.protocol.datatransfer.ReplaceDatanodeOnFailure$Policy 
defines non-transient non-serializable instance field condition
{code}

It's not actually new since this patch isn't introducing or modifying that 
class.  Not sure why it showed up here, but anyway I think this patch is ready 
to go.

> Allow dynamically changing the tracing level in Hadoop servers
> --------------------------------------------------------------
>
>                 Key: HDFS-6956
>                 URL: https://issues.apache.org/jira/browse/HDFS-6956
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: datanode, namenode
>            Reporter: Colin Patrick McCabe
>            Assignee: Colin Patrick McCabe
>         Attachments: HDFS-6956.002.patch, HDFS-6956.003.patch, 
> HDFS-6956.004.patch, HDFS-6956.005.patch
>
>
> We should allow users to dynamically change the tracing level in Hadoop 
> servers.  The easiest way to do this is probably to have an RPC accessible 
> only to the superuser that changes tracing settings.  This would allow us to 
> turn on and off tracing on the NameNode, DataNode, etc. at runtime.



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