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https://issues.apache.org/jira/browse/HDFS-3510?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13399761#comment-13399761
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Colin Patrick McCabe commented on HDFS-3510:
--------------------------------------------
The "13 new javadoc warnings messages" are coming from RAID, it seems, not this
patch
{code}
[WARNING]
/home/jenkins/jenkins-slave/workspace/PreCommit-HDFS-Build/trunk/hadoop-hdfs-project/hadoop-hdfs-raid/src/main/java/org/apache/hadoop/raid/Decoder.
java:180: warning - @param argument "parityFile" is not a parameter name.
[WARNING]
/home/jenkins/jenkins-slave/workspace/PreCommit-HDFS-Build/trunk/hadoop-hdfs-project/hadoop-hdfs-raid/src/main/java/org/apache/hadoop/raid/
DistRaidNode.java:58: warning - @inheritDocs is an unknown tag.
[WARNING]
/home/jenkins/jenkins-slave/workspace/PreCommit-HDFS-Build/trunk/hadoop-hdfs-project/hadoop-hdfs-raid/src/main/java/org/apache/hadoop/raid/
DistRaidNode.java:71: warning - @inheritDocs is an unknown tag.
[WARNING]
/home/jenkins/jenkins-slave/workspace/PreCommit-HDFS-Build/trunk/hadoop-hdfs-project/hadoop-hdfs-raid/src/main/java/org/apache/hadoop/raid/
DistRaidNode.java:58: warning - @inheritDocs is an unknown tag.
[WARNING]
/home/jenkins/jenkins-slave/workspace/PreCommit-HDFS-Build/trunk/hadoop-hdfs-project/hadoop-hdfs-raid/src/main/java/org/apache/hadoop/raid/
DistRaidNode.java:58: warning - @inheritDocs is an unknown tag.
[WARNING]
/home/jenkins/jenkins-slave/workspace/PreCommit-HDFS-Build/trunk/hadoop-hdfs-project/hadoop-hdfs-raid/src/main/java/org/apache/hadoop/raid/
DistRaidNode.java:71: warning - @inheritDocs is an unknown tag.
[WARNING]
/home/jenkins/jenkins-slave/workspace/PreCommit-HDFS-Build/trunk/hadoop-hdfs-project/hadoop-hdfs-raid/src/main/java/org/apache/hadoop/raid/
DistRaidNode.java:71: warning - @inheritDocs is an unknown tag.
[WARNING]
/home/jenkins/jenkins-slave/workspace/PreCommit-HDFS-Build/trunk/hadoop-hdfs-project/hadoop-hdfs-raid/src/main/java/org/apache/hadoop/raid/Encoder.
java:340: warning - @param argument "srcFile" is not a parameter name.
[WARNING]
/home/jenkins/jenkins-slave/workspace/PreCommit-HDFS-Build/trunk/hadoop-hdfs-project/hadoop-hdfs-raid/src/main/java/org/apache/hadoop/raid/
RaidConfigurationException.java:24: warning - Tag @link: reference not
found: CronNode
[WARNING]
/home/jenkins/jenkins-slave/workspace/PreCommit-HDFS-Build/trunk/hadoop-hdfs-project/hadoop-hdfs-raid/src/main/java/org/apache/hadoop/raid/
RaidConfigurationException.java:24: warning - Tag @link: reference not
found: CronNode
[WARNING]
/home/jenkins/jenkins-slave/workspace/PreCommit-HDFS-Build/trunk/hadoop-hdfs-project/hadoop-hdfs-raid/src/main/java/org/apache/hadoop/raid/
DistRaidNode.java:58: warning - @inheritDocs is an unknown tag.
[WARNING]
/home/jenkins/jenkins-slave/workspace/PreCommit-HDFS-Build/trunk/hadoop-hdfs-project/hadoop-hdfs-raid/src/main/java/org/apache/hadoop/raid/
RaidConfigurationException.java:24: warning - Tag @link: reference not
found: CronNode
[WARNING]
/home/jenkins/jenkins-slave/workspace/PreCommit-HDFS-Build/trunk/hadoop-hdfs-project/hadoop-hdfs-raid/src/main/java/org/apache/hadoop/raid/
DistRaidNode.java:71: warning - @inheritDocs is an unknown tag.
{code}
> Improve FSEditLog pre-allocation
> --------------------------------
>
> Key: HDFS-3510
> URL: https://issues.apache.org/jira/browse/HDFS-3510
> Project: Hadoop HDFS
> Issue Type: Bug
> Affects Versions: 1.0.0, 2.0.0-alpha
> Reporter: Colin Patrick McCabe
> Assignee: Colin Patrick McCabe
> Fix For: 1.0.0, 2.0.1-alpha
>
> Attachments: HDFS-3510-b1.001.patch, HDFS-3510-b1.002.patch,
> HDFS-3510.001.patch, HDFS-3510.003.patch, HDFS-3510.004.patch,
> HDFS-3510.004.patch, HDFS-3510.006.patch, HDFS-3510.007.patch,
> HDFS-3510.008.patch, HDFS-3510.009.patch, HDFS-3510.010.patch
>
>
> It is good to avoid running out of space in the middle of writing a batch of
> edits, because when it happens, we often get partial edits at the end of the
> log.
> Edit log preallocation can solve this problem (see HADOOP-2330 for a full
> description of edit log preallocation).
> The current pre-allocation code was introduced for performance reasons, not
> for preventing partial edits. As a consequence, we sometimes do a write
> without using pre-allocation. We should change the pre-allocation code so
> that it always preallocates at least enough space before writing out the
> edits.
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