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https://issues.apache.org/jira/browse/HDFS-2747?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13180861#comment-13180861
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Eli Collins commented on HDFS-2747:
-----------------------------------
Only fails the first time you try to enter:
{noformat}
hadoop-0.24.0-SNAPSHOT $ ./bin/hdfs dfsadmin -fs hdfs://localhost:8022
-safemode get
Safe mode is OFF
hadoop-0.24.0-SNAPSHOT $ ./bin/hdfs dfsadmin -fs hdfs://localhost:8022
-safemode enter
safemode: java.lang.NullPointerException
hadoop-0.24.0-SNAPSHOT $ ./bin/hdfs dfsadmin -fs hdfs://localhost:8022
-safemode get
Safe mode is OFF
hadoop-0.24.0-SNAPSHOT $ ./bin/hdfs dfsadmin -fs hdfs://localhost:8022
-safemode enter
Safe mode is ON
hadoop-0.24.0-SNAPSHOT $ ./bin/hdfs dfsadmin -fs hdfs://localhost:8022
-safemode get
Safe mode is ON
{noformat}
> HA: entering safe mode after starting SBN can NPE
> -------------------------------------------------
>
> Key: HDFS-2747
> URL: https://issues.apache.org/jira/browse/HDFS-2747
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: ha
> Affects Versions: HA branch (HDFS-1623)
> Reporter: Eli Collins
> Assignee: Uma Maheswara Rao G
>
> Entering Safemode on the primary after while it's already in safemode after
> the SBN is started results in an NPE:
> {noformat}
> hadoop-0.24.0-SNAPSHOT $ ./bin/hdfs dfsadmin -safemode get
> Safe mode is ON
> hadoop-0.24.0-SNAPSHOT $ ./bin/hdfs dfsadmin -safemode enter
> safemode: java.lang.NullPointerException
> {noformat}
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