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Posted to hdfs-issues@hadoop.apache.org by "Hudson (JIRA)" <ji...@apache.org> on 2018/03/22 21:58:05 UTC
[jira] [Commented] (HDFS-10796) libhdfs++: rationalize ioservice
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[ https://issues.apache.org/jira/browse/HDFS-10796?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16410455#comment-16410455 ]
Hudson commented on HDFS-10796:
-------------------------------
SUCCESS: Integrated in Jenkins build Hadoop-trunk-Commit #13869 (See [https://builds.apache.org/job/Hadoop-trunk-Commit/13869/])
HDFS-10796: libhdfs++: rationalize ioservice interactions. Contributed (james.clampffer: rev fbff671e0fae04b3ab8e11684de376f9c5c5f74a)
* (edit) hadoop-hdfs-project/hadoop-hdfs-native-client/src/main/native/libhdfspp/tests/hdfspp_mini_dfs.h
* (edit) hadoop-hdfs-project/hadoop-hdfs-native-client/src/main/native/libhdfspp/tests/CMakeLists.txt
* (edit) hadoop-hdfs-project/hadoop-hdfs-native-client/src/main/native/libhdfspp/include/hdfspp/hdfspp.h
* (edit) hadoop-hdfs-project/hadoop-hdfs-native-client/src/main/native/libhdfspp/lib/fs/filesystem.cc
* (edit) hadoop-hdfs-project/hadoop-hdfs-native-client/src/main/native/libhdfspp/lib/common/hdfs_ioservice.h
* (edit) hadoop-hdfs-project/hadoop-hdfs-native-client/src/main/native/libhdfspp/lib/common/logging.h
* (edit) hadoop-hdfs-project/hadoop-hdfs-native-client/src/main/native/libhdfspp/lib/common/options.cc
* (edit) hadoop-hdfs-project/hadoop-hdfs-native-client/src/main/native/libhdfspp/lib/fs/filesystem.h
* (edit) hadoop-hdfs-project/hadoop-hdfs-native-client/src/main/native/libhdfspp/lib/common/logging.cc
* (edit) hadoop-hdfs-project/hadoop-hdfs-native-client/src/main/native/libhdfspp/include/hdfspp/options.h
* (edit) hadoop-hdfs-project/hadoop-hdfs-native-client/src/main/native/libhdfspp/lib/common/hdfs_ioservice.cc
HDFS-10796: libhdfs++: Previous commit was missing (james.clampffer: rev a30cf6a369770381df4b3fb23d059749dbf6c4cf)
* (add) hadoop-hdfs-project/hadoop-hdfs-native-client/src/main/native/libhdfspp/tests/hdfs_ioservice_test.cc
> libhdfs++: rationalize ioservice interactions
> ---------------------------------------------
>
> Key: HDFS-10796
> URL: https://issues.apache.org/jira/browse/HDFS-10796
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: hdfs-client
> Reporter: Bob Hansen
> Assignee: James Clampffer
> Priority: Major
> Attachments: HDFS-10796.HDFS-8707.000.patch
>
>
> Firstly, we should be pulling the number of threads from options.io_threads (which should default to std::thread::hardware_concurrency()). The library should pass all tests always with io_threads set to 1 or to <a very high number>
> Secondly, we should have _a_ constructor where the consumer doesn't need to manage the IOService explicitly, and the FileSystemImpl should create its own internally.
> Since the FileSystem is defined as being for a particular user/identity, there is a valid use case for the consumer to be constructing many FileSystem instances to represent many authenticated users in the same process, but want to share resources (notably have a single io_service shared amongst them all). In this case, the consumer would want to own the IOService and pass the same instance to multiple FileSystem instances.
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