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https://issues.apache.org/jira/browse/HDFS-6978?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14156511#comment-14156511
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Hudson commented on HDFS-6978:
------------------------------
FAILURE: Integrated in Hadoop-Mapreduce-trunk #1914 (See
[https://builds.apache.org/job/Hadoop-Mapreduce-trunk/1914/])
HDFS-6978. Directory scanner should correctly reconcile blocks on RAM disk.
(Arpit Agarwal) (arp: rev 9f22fb8c9a10952225e15c7b67b5f77fa44b155d)
*
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/FsDatasetTestUtil.java
*
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/LazyWriteReplicaTracker.java
*
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/BlockPoolSlice.java
* hadoop-hdfs-project/hadoop-hdfs/CHANGES-HDFS-6581.txt
*
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/TestLazyPersistFiles.java
*
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/DirectoryScanner.java
*
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/TestDirectoryScanner.java
*
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/FsDatasetImpl.java
> Directory scanner should correctly reconcile blocks on RAM disk
> ---------------------------------------------------------------
>
> Key: HDFS-6978
> URL: https://issues.apache.org/jira/browse/HDFS-6978
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: datanode
> Affects Versions: HDFS-6581
> Reporter: Arpit Agarwal
> Assignee: Arpit Agarwal
> Fix For: 3.0.0
>
> Attachments: HDFS-6978.01.patch, HDFS-6978.02.patch
>
>
> It used to be very unlikely that the directory scanner encountered two
> replicas of the same block on different volumes.
> With memory storage, it is very likely to hit this with the following
> sequence of events:
> # Block is written to RAM disk
> # Lazy writer saves a copy on persistent volume
> # DN attempts to evict the original replica from RAM disk, file deletion
> fails as the replica is in use.
> # Directory scanner finds a replica on both RAM disk and persistent storage.
> The directory scanner should never delete the block on persistent storage.
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