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https://issues.apache.org/jira/browse/HDFS-7112?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14163023#comment-14163023
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Hudson commented on HDFS-7112:
------------------------------
FAILURE: Integrated in Hadoop-trunk-Commit #6212 (See
[https://builds.apache.org/job/Hadoop-trunk-Commit/6212/])
HDFS-7112. LazyWriter should use either async IO or one thread per physical
disk. Contributed by Xiaoyu Yao. (cnauroth: rev
1efd9c98258fbb973d2058dcf0850042e53bd02f)
*
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/FsVolumeImpl.java
*
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/FsDatasetImpl.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.txt
*
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/RamDiskAsyncLazyPersistService.java
*
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/SimulatedFSDataset.java
*
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/fsdataset/FsDatasetSpi.java
> LazyWriter should use either async IO or one thread per physical disk
> ---------------------------------------------------------------------
>
> Key: HDFS-7112
> URL: https://issues.apache.org/jira/browse/HDFS-7112
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: datanode
> Affects Versions: HDFS-6581
> Reporter: Arpit Agarwal
> Assignee: Xiaoyu Yao
> Fix For: 3.0.0
>
> Attachments: HDFS-7112.0.patch, HDFS-7112.1.patch, HDFS-7112.2.patch,
> HDFS-7112.3.patch
>
>
> The LazyWriter currently uses synchronous IO and a single thread. This limits
> the throughput to that of a single disk. Using either async overlapped IO or
> one thread per physical disk will improve the write throughput.
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