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From "Daryn Sharp (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-10301) Blocks removed by thousands due to falsely detected zombie storages
Date Mon, 18 Apr 2016 15:41:25 GMT

    [ https://issues.apache.org/jira/browse/HDFS-10301?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15245867#comment-15245867
] 

Daryn Sharp commented on HDFS-10301:
------------------------------------

Enabling HDFS-9198 will fifo process BRs.  It doesn't solve this implementation bug but virtually
eliminates it from occurring.

> Blocks removed by thousands due to falsely detected zombie storages
> -------------------------------------------------------------------
>
>                 Key: HDFS-10301
>                 URL: https://issues.apache.org/jira/browse/HDFS-10301
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: namenode
>    Affects Versions: 2.6.1
>            Reporter: Konstantin Shvachko
>            Priority: Critical
>         Attachments: zombieStorageLogs.rtf
>
>
> When NameNode is busy a DataNode can timeout sending a block report. Then it sends the
block report again. Then NameNode while process these two reports at the same time can interleave
processing storages from different reports. This screws up the blockReportId field, which
makes NameNode think that some storages are zombie. Replicas from zombie storages are immediately
removed, causing missing blocks.



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