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From "Aaron T. Myers (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-3325) When configuring "dfs.namenode.safemode.threshold-pct" to a value greater or equal to 1 there is mismatch in the UI report
Date Thu, 26 Apr 2012 17:16:18 GMT

     [ https://issues.apache.org/jira/browse/HDFS-3325?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Aaron T. Myers updated HDFS-3325:
---------------------------------

            Priority: Minor  (was: Major)
    Target Version/s: 2.0.0, 3.0.0  (was: 3.0.0, 2.0.0)
    
> When configuring "dfs.namenode.safemode.threshold-pct" to a value greater or equal to
1 there is mismatch in the UI report
> --------------------------------------------------------------------------------------------------------------------------
>
>                 Key: HDFS-3325
>                 URL: https://issues.apache.org/jira/browse/HDFS-3325
>             Project: Hadoop HDFS
>          Issue Type: Bug
>    Affects Versions: 2.0.0
>            Reporter: J.Andreina
>            Priority: Minor
>             Fix For: 2.0.0, 3.0.0
>
>
> When dfs.namenode.safemode.threshold-pct is configured to n
> Namenode will be in safemode until n percentage of blocks that should satisfy 
>     the minimal replication requirement defined by dfs.namenode.replication.min is reported
to namenode
> But in UI it displays that n percentage of total blocks + 1 blocks  are additionally
needed
> to come out of the safemode
> Scenario 1:
> ============
> Configurations:
> dfs.namenode.safemode.threshold-pct = 2
> dfs.replication = 2
> dfs.namenode.replication.min =2
> Step 1: Start NN,DN1,DN2
> Step 2: Write a file "a.txt" which has got 167 blocks
> step 3: Stop NN,DN1,DN2
> Step 4: start NN
> In UI report the Number of blocks needed to come out of safemode and number of blocks
actually present is different.
> {noformat}
> Cluster Summary
> Security is OFF 
> Safe mode is ON. The reported blocks 0 needs additional 335 blocks to reach the threshold
2.0000 of total blocks 167. Safe mode will be turned off automatically.
> 2 files and directories, 167 blocks = 169 total.
> Heap Memory used 57.05 MB is 2% of Commited Heap Memory 2 GB. Max Heap Memory is 2 GB.

> Non Heap Memory used 23.37 MB is 17% of Commited Non Heap Memory 130.44 MB. Max Non Heap
Memory is 176 MB.{noformat}
> Scenario 2:
> ===========
> Configurations:
> dfs.namenode.safemode.threshold-pct = 1
> dfs.replication = 2
> dfs.namenode.replication.min =2
> Step 1: Start NN,DN1,DN2
> Step 2: Write a file "a.txt" which has got 167 blocks
> step 3: Stop NN,DN1,DN2
> Step 4: start NN
> In UI report the Number of blocks needed to come out of safemode and number of blocks
actually present is different
> {noformat}
> Cluster Summary
> Security is OFF 
> Safe mode is ON. The reported blocks 0 needs additional 168 blocks to reach the threshold
1.0000 of total blocks 167. Safe mode will be turned off automatically.
> 2 files and directories, 167 blocks = 169 total.
> Heap Memory used 56.2 MB is 2% of Commited Heap Memory 2 GB. Max Heap Memory is 2 GB.

> Non Heap Memory used 23.37 MB is 17% of Commited Non Heap Memory 130.44 MB. Max Non Heap
Memory is 176 MB.{noformat}

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