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Date: Sat, 15 Oct 2016 02:10:20 +0000 (UTC)
From: "Konstantin Shvachko (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
Message-ID: <JIRA.12959486.1460922644000.838113.1476497420759@Atlassian.JIRA>
In-Reply-To: <JIRA.12959486.1460922644000@Atlassian.JIRA>
References: <JIRA.12959486.1460922644000@Atlassian.JIRA> <JIRA.12959486.1460922644843@arcas>
Subject: [jira] [Commented] (HDFS-10301) BlockReport retransmissions may
 lead to storages falsely being declared zombie if storage report processing
 happens out of order
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archived-at: Sat, 15 Oct 2016 02:10:23 -0000


    [ https://issues.apache.org/jira/browse/HDFS-10301?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15577150#comment-15577150 ] 

Konstantin Shvachko commented on HDFS-10301:
--------------------------------------------

Committed to trunk, branch-2, and branch-2.8
Leave it open while waiting for branch-2.7 patch.

> BlockReport retransmissions may lead to storages falsely being declared zombie if storage report processing happens out of order
> --------------------------------------------------------------------------------------------------------------------------------
>
>                 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
>            Assignee: Vinitha Reddy Gankidi
>            Priority: Critical
>         Attachments: HDFS-10301.002.patch, HDFS-10301.003.patch, HDFS-10301.004.patch, HDFS-10301.005.patch, HDFS-10301.006.patch, HDFS-10301.007.patch, HDFS-10301.008.patch, HDFS-10301.009.patch, HDFS-10301.01.patch, HDFS-10301.010.patch, HDFS-10301.011.patch, HDFS-10301.012.patch, HDFS-10301.013.patch, HDFS-10301.014.patch, HDFS-10301.015.patch, HDFS-10301.branch-2.015.patch, HDFS-10301.branch-2.7.patch, HDFS-10301.branch-2.patch, HDFS-10301.sample.patch, 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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