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Date: Tue, 17 Mar 2015 20:30:39 +0000 (UTC)
From: "Kihwal Lee (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
Message-ID: <JIRA.12765196.1420575114000.122387.1426624239397@Atlassian.JIRA>
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 <JIRA.12765196.1420575114182@arcas>
Subject: [jira] [Commented] (HDFS-7587) Edit log corruption can happen if
 append fails with a quota violation
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    [ https://issues.apache.org/jira/browse/HDFS-7587?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14366016#comment-14366016 ] 

Kihwal Lee commented on HDFS-7587:
----------------------------------

Is it possible for the last block size to be greater than the preferred block size?
{code}
+      final long diff = (file.getPreferredBlockSize() - lastBlock.getNumBytes())
+          * file.getBlockReplication();
{code}

> Edit log corruption can happen if append fails with a quota violation
> ---------------------------------------------------------------------
>
>                 Key: HDFS-7587
>                 URL: https://issues.apache.org/jira/browse/HDFS-7587
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: namenode
>            Reporter: Kihwal Lee
>            Assignee: Jing Zhao
>            Priority: Blocker
>         Attachments: HDFS-7587.001.patch, HDFS-7587.002.patch, HDFS-7587.patch
>
>
> We have seen a standby namenode crashing due to edit log corruption. It was complaining that {{OP_CLOSE}} cannot be applied because the file is not under-construction.
> When a client was trying to append to the file, the remaining space quota was very small. This caused a failure in {{prepareFileForWrite()}}, but after the inode was already converted for writing and a lease added. Since these were not undone when the quota violation was detected, the file was left in under-construction with an active lease without edit logging {{OP_ADD}}.
> A subsequent {{append()}} eventually caused a lease recovery after the soft limit period. This resulted in {{commitBlockSynchronization()}}, which closed the file with {{OP_CLOSE}} being logged.  Since there was no corresponding {{OP_ADD}}, edit replaying could not apply this.


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