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https://issues.apache.org/jira/browse/HDFS-12249?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16111667#comment-16111667
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Wellington Chevreuil commented on HDFS-12249:
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Thanks for the insights, [~jojochuang]! Just to confirm on the expectations
here, once a node goes into maintenance, its replicas would be listed under
"Blocks waiting for reconstruction" section?
Here is a sample output after some initial changes, for a block with 2
replicas, one of the replicas on a node under maintenance:
{noformat}
Live Datanodes: 0
Dead Datanodes: 0
Metasave: Blocks waiting for reconstruction: 1
file16387: blk_0_0 (replicas: live: 1 decommissioned: 0 corrupt: 0 in excess: 0
maintenance mode: 1) 1.1.1.1:9866(maintenance) (block deletions maybe out of
date) : 2.2.2.2:9866 (block deletions maybe out of date) :
Metasave: Blocks currently missing: 0
Mis-replicated blocks that have been postponed:
Metasave: Blocks being reconstructed: 0
Metasave: Blocks 0 waiting deletion from 0 datanodes.
Corrupt Blocks:
Metasave: Number of datanodes: 0
{noformat}
> dfsadmin -metaSave to output maintenance mode blocks
> ----------------------------------------------------
>
> Key: HDFS-12249
> URL: https://issues.apache.org/jira/browse/HDFS-12249
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: namenode
> Reporter: Wei-Chiu Chuang
> Assignee: Wellington Chevreuil
> Priority: Minor
>
> Found while reviewing for HDFS-12182.
> {quote}
> After the patch, the output of metaSave is:
> Live Datanodes: 0
> Dead Datanodes: 0
> Metasave: Blocks waiting for reconstruction: 0
> Metasave: Blocks currently missing: 1
> file16387: blk_0_1 MISSING (replicas: l: 0 d: 0 c: 2 e: 0)
> 1.1.1.1:9866(corrupt) (block deletions maybe out of date) :
> 2.2.2.2:9866(corrupt) (block deletions maybe out of date) :
> Mis-replicated blocks that have been postponed:
> Metasave: Blocks being reconstructed: 0
> Metasave: Blocks 0 waiting deletion from 0 datanodes.
> Corrupt Blocks:
> Block=0 Node=1.1.1.1:9866 StorageID=s1 StorageState=NORMAL
> TotalReplicas=2 Reason=GENSTAMP_MISMATCH
> Block=0 Node=2.2.2.2:9866 StorageID=s2 StorageState=NORMAL
> TotalReplicas=2 Reason=GENSTAMP_MISMATCH
> Metasave: Number of datanodes: 0
> {quote}
> {quote}
> Looking at the output
> The output is not user friendly — The meaning of "(replicas: l: 0 d: 0 c: 2
> e: 0)" is not obvious without looking at the code.
> Also, it should print maintenance mode replicas.
> {quote}
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