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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-9608) Disk IO imbalance in HDFS with heterogeneous storages
Date Wed, 17 Feb 2016 19:49:18 GMT

    [ https://issues.apache.org/jira/browse/HDFS-9608?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15151040#comment-15151040
] 

Hudson commented on HDFS-9608:
------------------------------

FAILURE: Integrated in Hadoop-trunk-Commit #9314 (See [https://builds.apache.org/job/Hadoop-trunk-Commit/9314/])
HDFS-9608. Disk IO imbalance in HDFS with heterogeneous storages. (wang: rev 3a23dc683c058d3a5262ae9dca2d1c8c588a6a3e)
* hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/TestRoundRobinVolumeChoosingPolicy.java
* hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/RoundRobinVolumeChoosingPolicy.java
* hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/AvailableSpaceVolumeChoosingPolicy.java
* hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt


> Disk IO imbalance in HDFS with heterogeneous storages
> -----------------------------------------------------
>
>                 Key: HDFS-9608
>                 URL: https://issues.apache.org/jira/browse/HDFS-9608
>             Project: Hadoop HDFS
>          Issue Type: Bug
>    Affects Versions: 2.6.0
>            Reporter: Wei Zhou
>            Assignee: Wei Zhou
>             Fix For: 2.9.0
>
>         Attachments: HDFS-9608.01.patch, HDFS-9608.02.patch, HDFS-9608.03.patch, HDFS-9608.04.patch,
HDFS-9608.05.patch, HDFS-9608.06.patch, HDFS-9608.07.patch
>
>
> Currently RoundRobinVolumeChoosingPolicy use a shared index to choose volumes in HDFS
with heterogeneous storages, this leads to non-RR choosing mode for certain type of storage.
> Besides, it uses a shared lock for synchronization which limits the concurrency of volume
choosing process. Volume choosing threads that operating on different storage types should
be able to run concurrently. 



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