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https://issues.apache.org/jira/browse/HDFS-4098?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13553015#comment-13553015
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Jing Zhao commented on HDFS-4098:
---------------------------------
Seems 4098 does not compile with javac in some JVM (e.g., in MAC with Java
version 1.6.0_37). The error msg is attached below. It should be caused by a
known bug with Java 1.6 according to these links:
https://bugs.eclipse.org/bugs/show_bug.cgi?id=98379,
http://stackoverflow.com/questions/8265296/ormlite-examples-for-android-wont-compile
[ERROR]
/Users/jing/Documents/workspace/hadoop_2802/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/snapshot/INodeFileWithLink.java:[55,30]
type parameters of <N>N cannot be determined; no unique maximal instance
exists for type variable N with upper bounds
java.lang.Object,org.apache.hadoop.hdfs.server.namenode.INodeFile,org.apache.hadoop.hdfs.server.namenode.snapshot.FileWithLink
[ERROR]
/Users/jing/Documents/workspace/hadoop_2802/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/snapshot/INodeFileWithLink.java:[61,35]
type parameters of <N>short cannot be determined; no unique maximal instance
exists for type variable N with upper bounds
org.apache.hadoop.hdfs.server.namenode.INodeFile,org.apache.hadoop.hdfs.server.namenode.snapshot.FileWithLink
[ERROR]
/Users/jing/Documents/workspace/hadoop_2802/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/snapshot/INodeFileWithLink.java:[70,46]
type parameters of <N>int cannot be determined; no unique maximal instance
exists for type variable N with upper bounds
org.apache.hadoop.hdfs.server.namenode.INodeFile,org.apache.hadoop.hdfs.server.namenode.snapshot.FileWithLink
[ERROR]
/Users/jing/Documents/workspace/hadoop_2802/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/snapshot/FileWithLink.java:[55,28]
type parameters of <N>N cannot be determined; no unique maximal instance
exists for type variable N with upper bounds
N,org.apache.hadoop.hdfs.server.namenode.INodeFile,org.apache.hadoop.hdfs.server.namenode.snapshot.FileWithLink
[ERROR]
/Users/jing/Documents/workspace/hadoop_2802/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/snapshot/FileWithLink.java:[55,69]
type parameters of <N>N cannot be determined; no unique maximal instance
exists for type variable N with upper bounds
N,org.apache.hadoop.hdfs.server.namenode.INodeFile,org.apache.hadoop.hdfs.server.namenode.snapshot.FileWithLink
[ERROR]
/Users/jing/Documents/workspace/hadoop_2802/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/snapshot/FileWithLink.java:[72,33]
type parameters of <N>N cannot be determined; no unique maximal instance
exists for type variable N with upper bounds
N,org.apache.hadoop.hdfs.server.namenode.INodeFile,org.apache.hadoop.hdfs.server.namenode.snapshot.FileWithLink
[ERROR]
/Users/jing/Documents/workspace/hadoop_2802/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/snapshot/FileWithLink.java:[80,28]
type parameters of <N>N cannot be determined; no unique maximal instance
exists for type variable N with upper bounds
N,org.apache.hadoop.hdfs.server.namenode.INodeFile,org.apache.hadoop.hdfs.server.namenode.snapshot.FileWithLink
[ERROR]
/Users/jing/Documents/workspace/hadoop_2802/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/snapshot/FileWithLink.java:[80,56]
type parameters of <N>N cannot be determined; no unique maximal instance
exists for type variable N with upper bounds
N,org.apache.hadoop.hdfs.server.namenode.INodeFile,org.apache.hadoop.hdfs.server.namenode.snapshot.FileWithLink
[ERROR]
/Users/jing/Documents/workspace/hadoop_2802/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/snapshot/FileWithLink.java:[92,36]
type parameters of <N>void cannot be determined; no unique maximal instance
exists for type variable N with upper bounds
org.apache.hadoop.hdfs.server.namenode.INodeFile,org.apache.hadoop.hdfs.server.namenode.snapshot.FileWithLink
[ERROR]
/Users/jing/Documents/workspace/hadoop_2802/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/snapshot/FileWithLink.java:[101,18]
type parameters of <N>void cannot be determined; no unique maximal instance
exists for type variable N with upper bounds
org.apache.hadoop.hdfs.server.namenode.INodeFile,org.apache.hadoop.hdfs.server.namenode.snapshot.FileWithLink
[ERROR]
/Users/jing/Documents/workspace/hadoop_2802/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/snapshot/FileWithLink.java:[120,35]
type parameters of <N>N cannot be determined; no unique maximal instance
exists for type variable N with upper bounds
N,org.apache.hadoop.hdfs.server.namenode.INodeFile,org.apache.hadoop.hdfs.server.namenode.snapshot.FileWithLink
[ERROR]
/Users/jing/Documents/workspace/hadoop_2802/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/snapshot/FileWithLink.java:[139,50]
type parameters of <N>N cannot be determined; no unique maximal instance
exists for type variable N with upper bounds
N,org.apache.hadoop.hdfs.server.namenode.INodeFile,org.apache.hadoop.hdfs.server.namenode.snapshot.FileWithLink
[ERROR]
/Users/jing/Documents/workspace/hadoop_2802/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/snapshot/INodeFileUnderConstructionWithLink.java:[70,30]
type parameters of <N>N cannot be determined; no unique maximal instance
exists for type variable N with upper bounds
java.lang.Object,org.apache.hadoop.hdfs.server.namenode.INodeFile,org.apache.hadoop.hdfs.server.namenode.snapshot.FileWithLink
[ERROR]
/Users/jing/Documents/workspace/hadoop_2802/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/snapshot/INodeFileUnderConstructionWithLink.java:[76,35]
type parameters of <N>short cannot be determined; no unique maximal instance
exists for type variable N with upper bounds
org.apache.hadoop.hdfs.server.namenode.INodeFile,org.apache.hadoop.hdfs.server.namenode.snapshot.FileWithLink
[ERROR]
/Users/jing/Documents/workspace/hadoop_2802/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/snapshot/INodeFileUnderConstructionWithLink.java:[85,46]
type parameters of <N>int cannot be determined; no unique maximal instance
exists for type variable N with upper bounds
org.apache.hadoop.hdfs.server.namenode.INodeFile,org.apache.hadoop.hdfs.server.namenode.snapshot.FileWithLink
> Support append to original files which are snapshotted
> ------------------------------------------------------
>
> Key: HDFS-4098
> URL: https://issues.apache.org/jira/browse/HDFS-4098
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: namenode
> Reporter: Tsz Wo (Nicholas), SZE
> Assignee: Tsz Wo (Nicholas), SZE
> Fix For: Snapshot (HDFS-2802)
>
> Attachments: h4098_20130107.patch, h4098_20130109b.patch,
> h4098_20130113.patch
>
>
> When a regular file is reopened for append, the type is changed from
> INodeFile to INodeFileUnderConstruction. The type of snapshotted files (i.e.
> original files) is INodeFileWithLink. We have to support similar "under
> construction" INodeFileWithLink.
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