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https://issues.apache.org/jira/browse/HDFS-10301?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15427386#comment-15427386
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Konstantin Shvachko commented on HDFS-10301:
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Hey [~cmccabe], I agree with you this jira is frustrating. And I find it hard
to overestimate your contribution to this. All points that you brought up here
were addressed. And on multiple occasions. If you choose or fail to hear and
understand other people arguments then there is little one could do to help
this. So I will ignore (now for real) all but one of your meta-comments,
because they were answered multiple times. Should you have a question please
formulate it for me to answer.
_I do not think you are in a position to judge qualifications of a community
member to fix a bug on public lists without knowing him or her. I find it
unprofessional, rude._
Working with Vinitha I can say she is no newbie in Hadoop, at all, even though
she was not directly involved with the community until recently. You owe here
an apology.
Now to the subject of this issue.
> 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
> Fix For: 2.7.4
>
> 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.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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