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From "Zhe Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-7225) Failed DataNode lookup can crash NameNode with NullPointerException
Date Thu, 30 Oct 2014 21:20:35 GMT

     [ https://issues.apache.org/jira/browse/HDFS-7225?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Zhe Zhang updated HDFS-7225:
----------------------------
    Attachment: HDFS-7225-v3.patch

Stale block invalidation tasks are cleaned in 2 places:
# A failed lookup
# When a datanode is wiped from the map in {{DatanodeManager}}

> Failed DataNode lookup can crash NameNode with NullPointerException
> -------------------------------------------------------------------
>
>                 Key: HDFS-7225
>                 URL: https://issues.apache.org/jira/browse/HDFS-7225
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: namenode
>    Affects Versions: 2.6.0
>            Reporter: Zhe Zhang
>            Assignee: Zhe Zhang
>         Attachments: HDFS-7225-v1.patch, HDFS-7225-v2.patch, HDFS-7225-v3.patch
>
>
> {{BlockManager#invalidateWorkForOneNode}} looks up a DataNode by the {{datanodeUuid}}
and passes the resultant {{DatanodeDescriptor}} to {{InvalidateBlocks#invalidateWork}}. However,
if a wrong or outdated {{datanodeUuid}} is used, a null pointer will be passed to {{invalidateWork}}
which will use it to lookup in a {{TreeMap}}. Since the key type is {{DatanodeDescriptor}},
key comparison is based on the IP address. A null key will crash the NameNode with an NPE.



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