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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7929) inotify unable fetch pre-upgrade edit log segments once upgrade starts
Date Thu, 19 Mar 2015 15:23:40 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7929?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14369516#comment-14369516
] 

Hudson commented on HDFS-7929:
------------------------------

FAILURE: Integrated in Hadoop-Mapreduce-trunk #2087 (See [https://builds.apache.org/job/Hadoop-Mapreduce-trunk/2087/])
HDFS-7929. inotify unable fetch pre-upgrade edit log segments once upgrade starts (Zhe Zhang
via Colin P. McCabe) (cmccabe: rev 43b41f22411439c5e23629197fb2fde45dcf0f0f)
* hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FileJournalManager.java
* hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSImage.java
* hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestDFSUpgrade.java
* hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/NNUpgradeUtil.java
* hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt


> inotify unable fetch pre-upgrade edit log segments once upgrade starts
> ----------------------------------------------------------------------
>
>                 Key: HDFS-7929
>                 URL: https://issues.apache.org/jira/browse/HDFS-7929
>             Project: Hadoop HDFS
>          Issue Type: Bug
>            Reporter: Zhe Zhang
>            Assignee: Zhe Zhang
>             Fix For: 2.7.0
>
>         Attachments: HDFS-7929-000.patch, HDFS-7929-001.patch, HDFS-7929-002.patch, HDFS-7929-003.patch
>
>
> inotify is often used to periodically poll HDFS events. However, once an HDFS upgrade
has started, edit logs are moved to /previous on the NN, which is not accessible. Moreover,
once the upgrade is finalized /previous is currently lost forever.



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