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From "He Xiaoqiao (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-12914) Block report leases cause missing blocks until next report
Date Thu, 20 Jun 2019 15:14:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-12914?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16868612#comment-16868612
] 

He Xiaoqiao commented on HDFS-12914:
------------------------------------

[~jojochuang] Submit [^HDFS-12914.branch-3.1.001.patch] for branch-3.1, Pending trigger Jenkins.
Please take a review. Thanks.

> Block report leases cause missing blocks until next report
> ----------------------------------------------------------
>
>                 Key: HDFS-12914
>                 URL: https://issues.apache.org/jira/browse/HDFS-12914
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: namenode
>    Affects Versions: 2.8.0, 2.9.2
>            Reporter: Daryn Sharp
>            Assignee: Santosh Marella
>            Priority: Critical
>             Fix For: 3.3.0, 3.2.1
>
>         Attachments: HDFS-12914-branch-2.001.patch, HDFS-12914-trunk.00.patch, HDFS-12914-trunk.01.patch,
HDFS-12914.005.patch, HDFS-12914.006.patch, HDFS-12914.007.patch, HDFS-12914.008.patch, HDFS-12914.009.patch,
HDFS-12914.branch-3.1.001.patch, HDFS-12914.branch-3.2.patch, HDFS-12914.utfix.patch
>
>
> {{BlockReportLeaseManager#checkLease}} will reject FBRs from DNs for conditions such
as "unknown datanode", "not in pending set", "lease has expired", wrong lease id, etc.  Lease
rejection does not throw an exception.  It returns false which bubbles up to  {{NameNodeRpcServer#blockReport}}
and interpreted as {{noStaleStorages}}.
> A re-registering node whose FBR is rejected from an invalid lease becomes active with
_no blocks_.  A replication storm ensues possibly causing DNs to temporarily go dead (HDFS-12645),
leading to more FBR lease rejections on re-registration.  The cluster will have many "missing
blocks" until the DNs next FBR is sent and/or forced.



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