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https://issues.apache.org/jira/browse/HDFS-1245?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13552114#comment-13552114
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Hudson commented on HDFS-1245:
------------------------------
Integrated in Hadoop-trunk-Commit #3222 (See
[https://builds.apache.org/job/Hadoop-trunk-Commit/3222/])
HDFS-1245. Plugable block id generation. Contributed by Konstantin
Shvachko. (Revision 1432539)
Result = SUCCESS
shv : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1432539
Files :
*
/hadoop/common/trunk/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/IdGenerator.java
*
/hadoop/common/trunk/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/SequentialNumber.java
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
*
/hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSImage.java
*
/hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java
*
/hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/RandomBlockIdGenerator.java
> Plugable block id generation
> -----------------------------
>
> Key: HDFS-1245
> URL: https://issues.apache.org/jira/browse/HDFS-1245
> Project: Hadoop HDFS
> Issue Type: New Feature
> Components: namenode
> Affects Versions: 0.22.0
> Reporter: Dmytro Molkov
> Assignee: Konstantin Shvachko
> Attachments: blockIdGenerator-branch2.patch, blockIdGenerator.patch
>
>
> The idea is to have a way to easily create block id generation engines that
> may fit a certain purpose. One of them could be HDFS-898 started by
> Konstantin, but potentially others.
> We chatted with Dhruba about this for a while and came up with the following
> approach:
> There should be a BlockIDGenerator interface that has following methods:
> void blockAdded(Block)
> void blockRemoved(Block)
> Block nextBlock()
> First two methods are needed for block generation engines that hold a certain
> state. During the restart, when namenode reads the fsimage it will notify
> generator about all the blocks it reads from the image and during runtime
> namenode will notify the generator about block removals on file deletion.
> The instance of the generator will also have a reference to the block
> registry, the interface that BlockManager implements. The only method there
> is __blockExists(Block)__, so that the current random block id generation can
> be implemented, since it needs to check with the block manager if the id is
> already present.
> What does the community think about this proposal?
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