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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-6109) let sync_file_range() system call run in background
Date Mon, 02 Jun 2014 20:41:03 GMT

    [ https://issues.apache.org/jira/browse/HDFS-6109?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14015869#comment-14015869
] 

Hudson commented on HDFS-6109:
------------------------------

SUCCESS: Integrated in Hadoop-trunk-Commit #5643 (See [https://builds.apache.org/job/Hadoop-trunk-Commit/5643/])
HDFS-6109 let sync_file_range() system call run in background (Liang Xie via stack) (stack:
http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1599347)
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSConfigKeys.java
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/BlockReceiver.java
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/DNConf.java
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/FsDatasetSpi.java
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/FsDatasetAsyncDiskService.java
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/FsDatasetImpl.java
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/SimulatedFSDataset.java


> let sync_file_range() system call run in background
> ---------------------------------------------------
>
>                 Key: HDFS-6109
>                 URL: https://issues.apache.org/jira/browse/HDFS-6109
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: datanode
>    Affects Versions: 3.0.0, 2.3.0
>            Reporter: Liang Xie
>            Assignee: Liang Xie
>             Fix For: 2.5.0
>
>         Attachments: HDFS-6109-v2.txt, HDFS-6109-v3.txt, HDFS-6109-v4.txt, HDFS-6109.txt
>
>
> Through we passed SYNC_FILE_RANGE_WRITE to sync_file_range, to make it as asynchronous
as possible, it still could be blocked, e.g. the os io request queue is full.
> Since we use sync_file_range just as a page cache advisor role:) it doesn't decide or
guarantee the real durability, it would be nice if we could run it in  backgroud. At least
my test log showed, a few sync_file_range calls still cost tens of ms or more, due to the
happened location is in the critical write path(BlockReceiver class), from a upper view, like
HBase application, will "hung" tens of ms as well during Hlog syncing.
> Generally speaking, the patch could not improve too much, but, better than before, right
? :)



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