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From "Wei-Chiu Chuang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-8533) Mismatch in displaying the "MissingBlock" count in fsck and in other metric reports
Date Tue, 16 Oct 2018 23:01:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-8533?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16652609#comment-16652609
] 

Wei-Chiu Chuang commented on HDFS-8533:
---------------------------------------

I'm pretty sure I found the root cause of this bug: HDFS-13999. There's a corner case where
we don't decrement the corrupt block counter (but the block is actually good)

> Mismatch in displaying the "MissingBlock" count in fsck and in other metric reports
> -----------------------------------------------------------------------------------
>
>                 Key: HDFS-8533
>                 URL: https://issues.apache.org/jira/browse/HDFS-8533
>             Project: Hadoop HDFS
>          Issue Type: Bug
>    Affects Versions: 2.7.0
>            Reporter: J.Andreina
>            Assignee: J.Andreina
>            Priority: Critical
>
> Number of DN = 2
> Step 1: Write a file with replication factor - 3 .
> Step 2: Corrupt a replica in DN1
> Step 3: DN2 is down. 
> Missing Block count in  report is as follows
> Fsck report                                    : *0*
> Jmx, "dfsadmin -report" , UI, logs : *1*
> In fsck , only block whose replicas are all missed and not been corrupted are counted

> {code}
> if (totalReplicasPerBlock == 0 && !isCorrupt) {
>         // If the block is corrupted, it means all its available replicas are
>         // corrupted. We don't mark it as missing given these available replicas
>         // might still be accessible as the block might be incorrectly marked as
>         // corrupted by client machines.
> {code}
> While in other reports even if all the replicas are corrupted , block is been considered
as missed.
> Please provide your thoughts : can we make missing block count consistent across all
the reports same as implemented for fsck?



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