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https://issues.apache.org/jira/browse/HDFS-8226?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14508472#comment-14508472
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J.Andreina commented on HDFS-8226:
----------------------------------
Observation:
=========
Namenode Thread Dump
{noformat}
"main" prio=10 tid=0x000000000061d000 nid=0x3778 runnable [0x00007f5a573d8000]
java.lang.Thread.State: RUNNABLE
at java.io.FileOutputStream.writeBytes(Native Method)
at java.io.FileOutputStream.write(FileOutputStream.java:345)
at
java.io.BufferedOutputStream.flushBuffer(BufferedOutputStream.java:82)
at java.io.BufferedOutputStream.flush(BufferedOutputStream.java:140)
- locked <0x00000000c868f3b0> (a java.io.BufferedOutputStream)
at java.io.PrintStream.write(PrintStream.java:482)
- locked <0x00000000c868f390> (a java.io.PrintStream)
at sun.nio.cs.StreamEncoder.writeBytes(StreamEncoder.java:221)
at sun.nio.cs.StreamEncoder.implFlushBuffer(StreamEncoder.java:291)
at sun.nio.cs.StreamEncoder.flushBuffer(StreamEncoder.java:104)
- locked <0x00000000c868f4e0> (a java.io.OutputStreamWriter)
at java.io.OutputStreamWriter.flushBuffer(OutputStreamWriter.java:185)
at java.io.PrintStream.write(PrintStream.java:527)
- locked <0x00000000c868f390> (a java.io.PrintStream)
at java.io.PrintStream.print(PrintStream.java:669)
at java.io.PrintStream.println(PrintStream.java:806)
- locked <0x00000000c868f390> (a java.io.PrintStream)
{noformat}
Shall we update the document to perform Non-HA rollback using “hdfs namenode
–rollback “ and then start namenode ? ( which would be incompatible with
previous version) .
Please provide feedback on this issue.
> Non-HA rollback compatibility broken
> ------------------------------------
>
> Key: HDFS-8226
> URL: https://issues.apache.org/jira/browse/HDFS-8226
> Project: Hadoop HDFS
> Issue Type: Bug
> Reporter: J.Andreina
> Assignee: J.Andreina
> Priority: Blocker
>
> In HA while performing rollback , we use “hdfs namenode –rollback” which
> would prompt user for confirmation. ( Implemented as part of HDFS-5138)
> For Non-HA , as per doc if we perform rollback using “start-dfs.sh –rollback”
> , then namenode startup hangs ( As it tries to start namenode in daemon mode
> , hence will not be able to prompt user for confirmation )
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