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Posted to common-dev@hadoop.apache.org by "Konstantin Shvachko (JIRA)" <ji...@apache.org> on 2007/04/07 00:52:32 UTC
[jira] Created: (HADOOP-1224) "Browse the filesystem" link pointing
to a dead data-node
"Browse the filesystem" link pointing to a dead data-node
---------------------------------------------------------
Key: HADOOP-1224
URL: https://issues.apache.org/jira/browse/HADOOP-1224
Project: Hadoop
Issue Type: Bug
Components: dfs
Affects Versions: 0.12.3
Reporter: Konstantin Shvachko
Fix For: 0.13.0
On the NameNode status web page "Browse the filesystem" link can point to a dead data-node.
The reason for that is that FSNamesystem.randomDataNode() selects a random node from the
list of all nodes rather then selecting among alive nodes only.
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[jira] Updated: (HADOOP-1224) "Browse the filesystem" link pointing
to a dead data-node
Posted by "Enis Soztutar (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HADOOP-1224?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Enis Soztutar updated HADOOP-1224:
----------------------------------
Attachment: DFSBrowsingDeadNode_v1.0.patch
This patch
1.changes randomDataNode() so that it will skip deadnodes and decommissioned nodes. Starts with a random data node and checks the data nodes sequentially until a live node is found.
2.changes the return type of the getDatanodeByIndex() from DatanodeInfo to DatanodeDescriptor.
> "Browse the filesystem" link pointing to a dead data-node
> ---------------------------------------------------------
>
> Key: HADOOP-1224
> URL: https://issues.apache.org/jira/browse/HADOOP-1224
> Project: Hadoop
> Issue Type: Bug
> Components: dfs
> Affects Versions: 0.12.3
> Reporter: Konstantin Shvachko
> Fix For: 0.13.0
>
> Attachments: DFSBrowsingDeadNode_v1.0.patch
>
>
> On the NameNode status web page "Browse the filesystem" link can point to a dead data-node.
> The reason for that is that FSNamesystem.randomDataNode() selects a random node from the
> list of all nodes rather then selecting among alive nodes only.
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[jira] Updated: (HADOOP-1224) "Browse the filesystem" link pointing
to a dead data-node
Posted by "Enis Soztutar (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HADOOP-1224?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Enis Soztutar updated HADOOP-1224:
----------------------------------
Status: Patch Available (was: Reopened)
> "Browse the filesystem" link pointing to a dead data-node
> ---------------------------------------------------------
>
> Key: HADOOP-1224
> URL: https://issues.apache.org/jira/browse/HADOOP-1224
> Project: Hadoop
> Issue Type: Bug
> Components: dfs
> Affects Versions: 0.12.3
> Reporter: Konstantin Shvachko
> Fix For: 0.13.0
>
> Attachments: DFSBrowsingDeadNode_v1.0.patch, DFSBrowsingDeadNode_v1.1.patch
>
>
> On the NameNode status web page "Browse the filesystem" link can point to a dead data-node.
> The reason for that is that FSNamesystem.randomDataNode() selects a random node from the
> list of all nodes rather then selecting among alive nodes only.
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[jira] Commented: (HADOOP-1224) "Browse the filesystem" link
pointing to a dead data-node
Posted by "Hadoop QA (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HADOOP-1224?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12489368 ]
Hadoop QA commented on HADOOP-1224:
-----------------------------------
Integrated in Hadoop-Nightly #60 (See http://lucene.zones.apache.org:8080/hudson/job/Hadoop-Nightly/60/)
> "Browse the filesystem" link pointing to a dead data-node
> ---------------------------------------------------------
>
> Key: HADOOP-1224
> URL: https://issues.apache.org/jira/browse/HADOOP-1224
> Project: Hadoop
> Issue Type: Bug
> Components: dfs
> Affects Versions: 0.12.3
> Reporter: Konstantin Shvachko
> Fix For: 0.13.0
>
> Attachments: DFSBrowsingDeadNode_v1.0.patch
>
>
> On the NameNode status web page "Browse the filesystem" link can point to a dead data-node.
> The reason for that is that FSNamesystem.randomDataNode() selects a random node from the
> list of all nodes rather then selecting among alive nodes only.
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[jira] Commented: (HADOOP-1224) "Browse the filesystem" link
pointing to a dead data-node
Posted by "Konstantin Shvachko (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HADOOP-1224?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12493787 ]
Konstantin Shvachko commented on HADOOP-1224:
---------------------------------------------
+1
> "Browse the filesystem" link pointing to a dead data-node
> ---------------------------------------------------------
>
> Key: HADOOP-1224
> URL: https://issues.apache.org/jira/browse/HADOOP-1224
> Project: Hadoop
> Issue Type: Bug
> Components: dfs
> Affects Versions: 0.12.3
> Reporter: Konstantin Shvachko
> Fix For: 0.13.0
>
> Attachments: DFSBrowsingDeadNode_v1.0.patch, DFSBrowsingDeadNode_v1.1.patch, DFSBrowsingDeadNode_v1.2.patch
>
>
> On the NameNode status web page "Browse the filesystem" link can point to a dead data-node.
> The reason for that is that FSNamesystem.randomDataNode() selects a random node from the
> list of all nodes rather then selecting among alive nodes only.
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[jira] Updated: (HADOOP-1224) "Browse the filesystem" link pointing
to a dead data-node
Posted by "Enis Soztutar (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HADOOP-1224?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Enis Soztutar updated HADOOP-1224:
----------------------------------
Status: Patch Available (was: Open)
> "Browse the filesystem" link pointing to a dead data-node
> ---------------------------------------------------------
>
> Key: HADOOP-1224
> URL: https://issues.apache.org/jira/browse/HADOOP-1224
> Project: Hadoop
> Issue Type: Bug
> Components: dfs
> Affects Versions: 0.12.3
> Reporter: Konstantin Shvachko
> Fix For: 0.13.0
>
> Attachments: DFSBrowsingDeadNode_v1.0.patch
>
>
> On the NameNode status web page "Browse the filesystem" link can point to a dead data-node.
> The reason for that is that FSNamesystem.randomDataNode() selects a random node from the
> list of all nodes rather then selecting among alive nodes only.
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[jira] Commented: (HADOOP-1224) "Browse the filesystem" link
pointing to a dead data-node
Posted by "Konstantin Shvachko (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HADOOP-1224?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12493435 ]
Konstantin Shvachko commented on HADOOP-1224:
---------------------------------------------
It is confusing if a data-node can be neither dead nor alive. In your patch
isDatanodeDead() =/= ! isDatanodeLive()
The patch should merely add "!" imo.
> "Browse the filesystem" link pointing to a dead data-node
> ---------------------------------------------------------
>
> Key: HADOOP-1224
> URL: https://issues.apache.org/jira/browse/HADOOP-1224
> Project: Hadoop
> Issue Type: Bug
> Components: dfs
> Affects Versions: 0.12.3
> Reporter: Konstantin Shvachko
> Fix For: 0.13.0
>
> Attachments: DFSBrowsingDeadNode_v1.0.patch, DFSBrowsingDeadNode_v1.1.patch
>
>
> On the NameNode status web page "Browse the filesystem" link can point to a dead data-node.
> The reason for that is that FSNamesystem.randomDataNode() selects a random node from the
> list of all nodes rather then selecting among alive nodes only.
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[jira] Commented: (HADOOP-1224) "Browse the filesystem" link
pointing to a dead data-node
Posted by "dhruba borthakur (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HADOOP-1224?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12488753 ]
dhruba borthakur commented on HADOOP-1224:
------------------------------------------
+1. Code looks good.
> "Browse the filesystem" link pointing to a dead data-node
> ---------------------------------------------------------
>
> Key: HADOOP-1224
> URL: https://issues.apache.org/jira/browse/HADOOP-1224
> Project: Hadoop
> Issue Type: Bug
> Components: dfs
> Affects Versions: 0.12.3
> Reporter: Konstantin Shvachko
> Fix For: 0.13.0
>
> Attachments: DFSBrowsingDeadNode_v1.0.patch
>
>
> On the NameNode status web page "Browse the filesystem" link can point to a dead data-node.
> The reason for that is that FSNamesystem.randomDataNode() selects a random node from the
> list of all nodes rather then selecting among alive nodes only.
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[jira] Reopened: (HADOOP-1224) "Browse the filesystem" link
pointing to a dead data-node
Posted by "Konstantin Shvachko (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HADOOP-1224?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Konstantin Shvachko reopened HADOOP-1224:
-----------------------------------------
Now its even worse, we select ONLY! dead nodes.
if (d != null && !d.isDecommissioned() && isDatanodeDead(d) &&
!d.isDecommissionInProgress()) {
return d.getHost() + ":" + d.getInfoPort();
Did anybody ever actually tried to click the link?
> "Browse the filesystem" link pointing to a dead data-node
> ---------------------------------------------------------
>
> Key: HADOOP-1224
> URL: https://issues.apache.org/jira/browse/HADOOP-1224
> Project: Hadoop
> Issue Type: Bug
> Components: dfs
> Affects Versions: 0.12.3
> Reporter: Konstantin Shvachko
> Fix For: 0.13.0
>
> Attachments: DFSBrowsingDeadNode_v1.0.patch
>
>
> On the NameNode status web page "Browse the filesystem" link can point to a dead data-node.
> The reason for that is that FSNamesystem.randomDataNode() selects a random node from the
> list of all nodes rather then selecting among alive nodes only.
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[jira] Commented: (HADOOP-1224) "Browse the filesystem" link
pointing to a dead data-node
Posted by "Enis Soztutar (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HADOOP-1224?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12493606 ]
Enis Soztutar commented on HADOOP-1224:
---------------------------------------
The confusing thing here, IMO, is that the admin status of the datanode, can be either NORMAL, DECOMMISIONED or DECOMMISSION_IN_PROGRESS, and if the admin state is normal, it can be either dead or "not dead". So a data node, from the perspective of the end user, can be in one of the four states : live, dead, decommissioned or decommission_in_progress. Thus isDatanodeDead() =/= ! isDatanodeLive().
> "Browse the filesystem" link pointing to a dead data-node
> ---------------------------------------------------------
>
> Key: HADOOP-1224
> URL: https://issues.apache.org/jira/browse/HADOOP-1224
> Project: Hadoop
> Issue Type: Bug
> Components: dfs
> Affects Versions: 0.12.3
> Reporter: Konstantin Shvachko
> Fix For: 0.13.0
>
> Attachments: DFSBrowsingDeadNode_v1.0.patch, DFSBrowsingDeadNode_v1.1.patch
>
>
> On the NameNode status web page "Browse the filesystem" link can point to a dead data-node.
> The reason for that is that FSNamesystem.randomDataNode() selects a random node from the
> list of all nodes rather then selecting among alive nodes only.
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[jira] Updated: (HADOOP-1224) "Browse the filesystem" link pointing
to a dead data-node
Posted by "Tom White (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HADOOP-1224?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Tom White updated HADOOP-1224:
------------------------------
Resolution: Fixed
Status: Resolved (was: Patch Available)
I've just committed this. Thanks Enis!
> "Browse the filesystem" link pointing to a dead data-node
> ---------------------------------------------------------
>
> Key: HADOOP-1224
> URL: https://issues.apache.org/jira/browse/HADOOP-1224
> Project: Hadoop
> Issue Type: Bug
> Components: dfs
> Affects Versions: 0.12.3
> Reporter: Konstantin Shvachko
> Fix For: 0.13.0
>
> Attachments: DFSBrowsingDeadNode_v1.0.patch
>
>
> On the NameNode status web page "Browse the filesystem" link can point to a dead data-node.
> The reason for that is that FSNamesystem.randomDataNode() selects a random node from the
> list of all nodes rather then selecting among alive nodes only.
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[jira] Updated: (HADOOP-1224) "Browse the filesystem" link pointing
to a dead data-node
Posted by "Doug Cutting (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HADOOP-1224?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Doug Cutting updated HADOOP-1224:
---------------------------------
Resolution: Fixed
Status: Resolved (was: Patch Available)
I just committed this. Thanks, Enis!
> "Browse the filesystem" link pointing to a dead data-node
> ---------------------------------------------------------
>
> Key: HADOOP-1224
> URL: https://issues.apache.org/jira/browse/HADOOP-1224
> Project: Hadoop
> Issue Type: Bug
> Components: dfs
> Affects Versions: 0.12.3
> Reporter: Konstantin Shvachko
> Fix For: 0.13.0
>
> Attachments: DFSBrowsingDeadNode_v1.0.patch, DFSBrowsingDeadNode_v1.1.patch, DFSBrowsingDeadNode_v1.2.patch
>
>
> On the NameNode status web page "Browse the filesystem" link can point to a dead data-node.
> The reason for that is that FSNamesystem.randomDataNode() selects a random node from the
> list of all nodes rather then selecting among alive nodes only.
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[jira] Updated: (HADOOP-1224) "Browse the filesystem" link pointing
to a dead data-node
Posted by "Enis Soztutar (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HADOOP-1224?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Enis Soztutar updated HADOOP-1224:
----------------------------------
Attachment: DFSBrowsingDeadNode_v1.1.patch
This patch applies to current trunk(534354). Fixes the bug in [forgotten!] negation in check in isDataNodeDead(), introduces a function isDataNodeLive()
> "Browse the filesystem" link pointing to a dead data-node
> ---------------------------------------------------------
>
> Key: HADOOP-1224
> URL: https://issues.apache.org/jira/browse/HADOOP-1224
> Project: Hadoop
> Issue Type: Bug
> Components: dfs
> Affects Versions: 0.12.3
> Reporter: Konstantin Shvachko
> Fix For: 0.13.0
>
> Attachments: DFSBrowsingDeadNode_v1.0.patch, DFSBrowsingDeadNode_v1.1.patch
>
>
> On the NameNode status web page "Browse the filesystem" link can point to a dead data-node.
> The reason for that is that FSNamesystem.randomDataNode() selects a random node from the
> list of all nodes rather then selecting among alive nodes only.
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[jira] Commented: (HADOOP-1224) "Browse the filesystem" link
pointing to a dead data-node
Posted by "Hadoop QA (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HADOOP-1224?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12493044 ]
Hadoop QA commented on HADOOP-1224:
-----------------------------------
+1
http://issues.apache.org/jira/secure/attachment/12356611/DFSBrowsingDeadNode_v1.1.patch applied and successfully tested against trunk revision r534234.
Test results: http://lucene.zones.apache.org:8080/hudson/job/Hadoop-Patch/100/testReport/
Console output: http://lucene.zones.apache.org:8080/hudson/job/Hadoop-Patch/100/console
> "Browse the filesystem" link pointing to a dead data-node
> ---------------------------------------------------------
>
> Key: HADOOP-1224
> URL: https://issues.apache.org/jira/browse/HADOOP-1224
> Project: Hadoop
> Issue Type: Bug
> Components: dfs
> Affects Versions: 0.12.3
> Reporter: Konstantin Shvachko
> Fix For: 0.13.0
>
> Attachments: DFSBrowsingDeadNode_v1.0.patch, DFSBrowsingDeadNode_v1.1.patch
>
>
> On the NameNode status web page "Browse the filesystem" link can point to a dead data-node.
> The reason for that is that FSNamesystem.randomDataNode() selects a random node from the
> list of all nodes rather then selecting among alive nodes only.
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[jira] Commented: (HADOOP-1224) "Browse the filesystem" link
pointing to a dead data-node
Posted by "Tom White (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HADOOP-1224?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12493089 ]
Tom White commented on HADOOP-1224:
-----------------------------------
Thanks Enis. Have you manually tested this latest patch as Konstantin suggests?
> "Browse the filesystem" link pointing to a dead data-node
> ---------------------------------------------------------
>
> Key: HADOOP-1224
> URL: https://issues.apache.org/jira/browse/HADOOP-1224
> Project: Hadoop
> Issue Type: Bug
> Components: dfs
> Affects Versions: 0.12.3
> Reporter: Konstantin Shvachko
> Fix For: 0.13.0
>
> Attachments: DFSBrowsingDeadNode_v1.0.patch, DFSBrowsingDeadNode_v1.1.patch
>
>
> On the NameNode status web page "Browse the filesystem" link can point to a dead data-node.
> The reason for that is that FSNamesystem.randomDataNode() selects a random node from the
> list of all nodes rather then selecting among alive nodes only.
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[jira] Commented: (HADOOP-1224) "Browse the filesystem" link
pointing to a dead data-node
Posted by "Hadoop QA (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HADOOP-1224?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12494260 ]
Hadoop QA commented on HADOOP-1224:
-----------------------------------
Integrated in Hadoop-Nightly #82 (See http://lucene.zones.apache.org:8080/hudson/job/Hadoop-Nightly/82/)
> "Browse the filesystem" link pointing to a dead data-node
> ---------------------------------------------------------
>
> Key: HADOOP-1224
> URL: https://issues.apache.org/jira/browse/HADOOP-1224
> Project: Hadoop
> Issue Type: Bug
> Components: dfs
> Affects Versions: 0.12.3
> Reporter: Konstantin Shvachko
> Fix For: 0.13.0
>
> Attachments: DFSBrowsingDeadNode_v1.0.patch, DFSBrowsingDeadNode_v1.1.patch, DFSBrowsingDeadNode_v1.2.patch
>
>
> On the NameNode status web page "Browse the filesystem" link can point to a dead data-node.
> The reason for that is that FSNamesystem.randomDataNode() selects a random node from the
> list of all nodes rather then selecting among alive nodes only.
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[jira] Commented: (HADOOP-1224) "Browse the filesystem" link
pointing to a dead data-node
Posted by "Hadoop QA (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HADOOP-1224?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12488671 ]
Hadoop QA commented on HADOOP-1224:
-----------------------------------
+1
http://issues.apache.org/jira/secure/attachment/12355503/DFSBrowsingDeadNode_v1.0.patch applied and successfully tested against trunk revision r528230.
Test results: http://lucene.zones.apache.org:8080/hudson/job/Hadoop-Patch/43/testReport/
Console output: http://lucene.zones.apache.org:8080/hudson/job/Hadoop-Patch/43/console
> "Browse the filesystem" link pointing to a dead data-node
> ---------------------------------------------------------
>
> Key: HADOOP-1224
> URL: https://issues.apache.org/jira/browse/HADOOP-1224
> Project: Hadoop
> Issue Type: Bug
> Components: dfs
> Affects Versions: 0.12.3
> Reporter: Konstantin Shvachko
> Fix For: 0.13.0
>
> Attachments: DFSBrowsingDeadNode_v1.0.patch
>
>
> On the NameNode status web page "Browse the filesystem" link can point to a dead data-node.
> The reason for that is that FSNamesystem.randomDataNode() selects a random node from the
> list of all nodes rather then selecting among alive nodes only.
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[jira] Commented: (HADOOP-1224) "Browse the filesystem" link
pointing to a dead data-node
Posted by "Tom White (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HADOOP-1224?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12493540 ]
Tom White commented on HADOOP-1224:
-----------------------------------
> The patch should merely add "!" imo.
+1
> "Browse the filesystem" link pointing to a dead data-node
> ---------------------------------------------------------
>
> Key: HADOOP-1224
> URL: https://issues.apache.org/jira/browse/HADOOP-1224
> Project: Hadoop
> Issue Type: Bug
> Components: dfs
> Affects Versions: 0.12.3
> Reporter: Konstantin Shvachko
> Fix For: 0.13.0
>
> Attachments: DFSBrowsingDeadNode_v1.0.patch, DFSBrowsingDeadNode_v1.1.patch
>
>
> On the NameNode status web page "Browse the filesystem" link can point to a dead data-node.
> The reason for that is that FSNamesystem.randomDataNode() selects a random node from the
> list of all nodes rather then selecting among alive nodes only.
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[jira] Commented: (HADOOP-1224) "Browse the filesystem" link
pointing to a dead data-node
Posted by "Enis Soztutar (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HADOOP-1224?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12493302 ]
Enis Soztutar commented on HADOOP-1224:
---------------------------------------
Finally, i was able to test the patch.
Manually i have set up a cluster with 2 DN and one NN.
After intentionally killing one DN, or decommisioning one DN, browsing worked as expected. Sorry for the previously untested version :)
> "Browse the filesystem" link pointing to a dead data-node
> ---------------------------------------------------------
>
> Key: HADOOP-1224
> URL: https://issues.apache.org/jira/browse/HADOOP-1224
> Project: Hadoop
> Issue Type: Bug
> Components: dfs
> Affects Versions: 0.12.3
> Reporter: Konstantin Shvachko
> Fix For: 0.13.0
>
> Attachments: DFSBrowsingDeadNode_v1.0.patch, DFSBrowsingDeadNode_v1.1.patch
>
>
> On the NameNode status web page "Browse the filesystem" link can point to a dead data-node.
> The reason for that is that FSNamesystem.randomDataNode() selects a random node from the
> list of all nodes rather then selecting among alive nodes only.
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[jira] Updated: (HADOOP-1224) "Browse the filesystem" link pointing
to a dead data-node
Posted by "Enis Soztutar (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HADOOP-1224?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Enis Soztutar updated HADOOP-1224:
----------------------------------
Attachment: DFSBrowsingDeadNode_v1.2.patch
one line patch that adds "!" .
> "Browse the filesystem" link pointing to a dead data-node
> ---------------------------------------------------------
>
> Key: HADOOP-1224
> URL: https://issues.apache.org/jira/browse/HADOOP-1224
> Project: Hadoop
> Issue Type: Bug
> Components: dfs
> Affects Versions: 0.12.3
> Reporter: Konstantin Shvachko
> Fix For: 0.13.0
>
> Attachments: DFSBrowsingDeadNode_v1.0.patch, DFSBrowsingDeadNode_v1.1.patch, DFSBrowsingDeadNode_v1.2.patch
>
>
> On the NameNode status web page "Browse the filesystem" link can point to a dead data-node.
> The reason for that is that FSNamesystem.randomDataNode() selects a random node from the
> list of all nodes rather then selecting among alive nodes only.
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