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https://issues.apache.org/jira/browse/HDFS-7994?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14938079#comment-14938079
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Hudson commented on HDFS-7994:
------------------------------
FAILURE: Integrated in Hadoop-Hdfs-trunk-Java8 #439 (See
[https://builds.apache.org/job/Hadoop-Hdfs-trunk-Java8/439/])
HDFS-7994. Detect if resevered EC Block ID is already used during (zhezhang:
rev 4c039b0876bb9399c2b4a751ad7b99b36349117b)
*
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/BlockManager.java
*
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSImageFormatPBINode.java
*
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/snapshot/FSImageFormatPBSnapshot.java
*
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestFSImage.java
* hadoop-hdfs-project/hadoop-hdfs/CHANGES-HDFS-EC-7285.txt
*
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSImageFormat.java
*
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestFSEditLogLoader.java
*
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSEditLogLoader.java
> Detect if resevered EC Block ID is already used
> -----------------------------------------------
>
> Key: HDFS-7994
> URL: https://issues.apache.org/jira/browse/HDFS-7994
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: namenode
> Reporter: Tsz Wo Nicholas Sze
> Assignee: Hui Zheng
> Fix For: HDFS-7285
>
> Attachments: HDFS-7994_001.patch, HDFS-7994_002.patch
>
>
> Since random block IDs were supported by some early version of HDFS, the
> block ID reserved for EC blocks could be already used by some existing blocks
> in a cluster. During NameNode startup, it detects if there are reserved EC
> block IDs used by non-EC blocks. If it is the case, NameNode will do an
> additional blocksMap lookup when there is a miss in a blockGroupsMap lookup.
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