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https://issues.apache.org/jira/browse/HDFS-3107?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14150681#comment-14150681
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Plamen Jeliazkov commented on HDFS-3107:
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The FindBugs addition seems to be for a class that is unmodified by my patch:
"Class
org.apache.hadoop.hdfs.protocol.datatransfer.ReplaceDatanodeOnFailure$Policy
defines non-transient non-serializable instance field condition"
I am not sure how that happened. I could remedy it by adding a transient
modifier to the Condition field 'condition', but it seems that it is unrelated
to the truncate patch.
Probably best to keep the separation of concerns.
The failure in TestEncryptionZonesWithKMS was due to a Mini HDFS Cluster setup
timing out.
I have ran TestEncryptionZonesWithKMS locally and seen it succeed with my patch
applied.
If you are going to commit be aware that you have to also commit the attached
'editsStored' file into the hadoop-hdfs-project/hadoop-hdfs/src/test/resources
directory and overwrite the file that is already there.
> HDFS truncate
> -------------
>
> Key: HDFS-3107
> URL: https://issues.apache.org/jira/browse/HDFS-3107
> Project: Hadoop HDFS
> Issue Type: New Feature
> Components: datanode, namenode
> Reporter: Lei Chang
> Assignee: Plamen Jeliazkov
> Attachments: HDFS-3107.patch, HDFS-3107.patch, HDFS-3107.patch,
> HDFS-3107.patch, HDFS-3107.patch, HDFS_truncate.pdf,
> HDFS_truncate_semantics_Mar15.pdf, HDFS_truncate_semantics_Mar21.pdf,
> editsStored
>
> Original Estimate: 1,344h
> Remaining Estimate: 1,344h
>
> Systems with transaction support often need to undo changes made to the
> underlying storage when a transaction is aborted. Currently HDFS does not
> support truncate (a standard Posix operation) which is a reverse operation of
> append, which makes upper layer applications use ugly workarounds (such as
> keeping track of the discarded byte range per file in a separate metadata
> store, and periodically running a vacuum process to rewrite compacted files)
> to overcome this limitation of HDFS.
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