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From "Tsz Wo Nicholas Sze (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-7842) Blocks missed while performing downgrade immediately after rolling back the cluster.
Date Tue, 03 Mar 2015 02:18:05 GMT

     [ https://issues.apache.org/jira/browse/HDFS-7842?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Tsz Wo Nicholas Sze updated HDFS-7842:
--------------------------------------
    Component/s: datanode

> Blocks missed while performing downgrade immediately after rolling back the cluster.
> ------------------------------------------------------------------------------------
>
>                 Key: HDFS-7842
>                 URL: https://issues.apache.org/jira/browse/HDFS-7842
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: datanode
>            Reporter: J.Andreina
>            Assignee: J.Andreina
>            Priority: Critical
>
> Performing downgrade immediately after rolling back the cluster , will replace the blocks
from trash 
> Since the block id for the files created before rollback will be same as the file created
before downgrade, namenode will get into safemode , as the block size reported from Datanode
will be different from the one in block map (corrupted blocks) .
> Steps to Reproduce
> {noformat}
> Step 1: Prepare rolling upgrade using "hdfs dfsadmin -rollingUpgrade prepare"
> Step 2: Shutdown SNN and NN
> Step 3: Start NN with the "hdfs namenode -rollingUpgrade started" option.
> Step 4: Executed "hdfs dfsadmin -shutdownDatanode <DATANODE_HOST:IPC_PORT> upgrade"
and restarted Datanode
> Step 5: Create File_1 of size 11526
> Step 6: Shutdown both NN and DN
> Step 7: Start NNs with the "hdfs namenode -rollingUpgrade rollback" option.
> 	Start DNs with the "-rollback" option.
> Step 8: Prepare rolling upgrade using "hdfs dfsadmin -rollingUpgrade prepare"
> Step 9: Shutdown SNN and NN
> Step 10: Start NN with the "hdfs namenode -rollingUpgrade started" option .
> Step 11: Executed "hdfs dfsadmin -shutdownDatanode <DATANODE_HOST:IPC_PORT> upgrade"
and restarted Datanode
> step 12: Add file File_2 with size 6324 (which has same blockid as previous created File_1
with block size 11526)
> Step 13: Shutdown both NN and DN
> Step 14: Start NNs with the "hdfs namenode -rollingUpgrade downgrade" option.Start DNs
normally.
> {noformat}



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