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From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-11915) Document and test 0.94 -> 1.0.0 update
Date Thu, 23 Oct 2014 05:05:34 GMT

    [ https://issues.apache.org/jira/browse/HBASE-11915?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14181020#comment-14181020
] 

stack commented on HBASE-11915:
-------------------------------

Let me add an addendum.  Testing on a cluster I get this when I do -execute of the migration:
{code}
2014-10-22 21:30:25,149 WARN  [main] util.FSUtils: Unable to create version file at hdfs://c2020.halxg.cloudera.com:8020/hbase,
retrying
java.io.IOException: Unable to move temp version file to hdfs://c2020.halxg.cloudera.com:8020/hbase/hbase.version
	at org.apache.hadoop.hbase.util.FSUtils.setVersion(FSUtils.java:644)
	at org.apache.hadoop.hbase.util.FSUtils.setVersion(FSUtils.java:599)
	at org.apache.hadoop.hbase.migration.NamespaceUpgrade.upgradeTableDirs(NamespaceUpgrade.java:151)
	at org.apache.hadoop.hbase.migration.NamespaceUpgrade.run(NamespaceUpgrade.java:562)
	at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:70)
	at org.apache.hadoop.hbase.migration.UpgradeTo96.executeTool(UpgradeTo96.java:221)
	at org.apache.hadoop.hbase.migration.UpgradeTo96.executeUpgrade(UpgradeTo96.java:211)
	at org.apache.hadoop.hbase.migration.UpgradeTo96.run(UpgradeTo96.java:133)
	at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:70)
	at org.apache.hadoop.hbase.migration.UpgradeTo96.main(UpgradeTo96.java:257)
2014-10-22 21:30:25,164 INFO  [main] hdfs.DFSClient: checksum=CRC32C
{code}

It is actually  harmless case of TMI but it took me a minute or two to figure that so lets
spare the poor operator.

Small patch.  i tested it works on a new migration.

I started a 0.94 on a hadoop 2.6.0-SNAPSHOT.  I inserted some data.  Shut it down.  Installed
a branch-1 build.  Ran upgrade -check then upgrade -execute.  Then was able to start up the
0.99 over the 0.94 data.

Need to try and see what breaks when we run an application against 0.94 and then 1.0 but that
is another issue.

> Document and test 0.94 -> 1.0.0 update
> --------------------------------------
>
>                 Key: HBASE-11915
>                 URL: https://issues.apache.org/jira/browse/HBASE-11915
>             Project: HBase
>          Issue Type: Sub-task
>            Reporter: Enis Soztutar
>            Assignee: stack
>            Priority: Critical
>             Fix For: 0.99.2
>
>         Attachments: 11915.txt, upgrade.txt
>
>
> We explicitly did not remove some of the upgrade related stuff in branch-1 for the possibility
of supporting 0.94 -> 1.0, similar to 0.94 -> 0.98 support. 
> We should document, and test this support before 1.0 comes. 



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