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https://issues.apache.org/jira/browse/HDFS-8863?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14707444#comment-14707444
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Hudson commented on HDFS-8863:
------------------------------
FAILURE: Integrated in Hadoop-Yarn-trunk-Java8 #294 (See
[https://builds.apache.org/job/Hadoop-Yarn-trunk-Java8/294/])
HDFS-8863. The remaining space check in BlockPlacementPolicyDefault is flawed.
(Kihwal Lee via yliu) (yliu: rev 5e8fe8943718309b5e39a794360aebccae28b331)
*
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/DatanodeDescriptor.java
*
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/BlockPlacementPolicyDefault.java
*
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/blockmanagement/TestReplicationPolicy.java
* hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
> The remaining space check in BlockPlacementPolicyDefault is flawed
> ------------------------------------------------------------------
>
> Key: HDFS-8863
> URL: https://issues.apache.org/jira/browse/HDFS-8863
> Project: Hadoop HDFS
> Issue Type: Bug
> Affects Versions: 2.6.0
> Reporter: Kihwal Lee
> Assignee: Kihwal Lee
> Priority: Critical
> Labels: 2.6.1-candidate
> Fix For: 2.7.2
>
> Attachments: HDFS-8863.patch, HDFS-8863.v2.patch, HDFS-8863.v3.patch
>
>
> The block placement policy calls
> {{DatanodeDescriptor#getRemaining(StorageType}}}} to check whether the block
> is going to fit. Since the method is adding up all remaining spaces, namenode
> can allocate a new block on a full node. This causes pipeline construction
> failure and {{abandonBlock}}. If the cluster is nearly full, the client might
> hit this multiple times and the write can fail permanently.
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