hadoop-hdfs-issues mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Junping Du (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-7964) Add support for async edit logging
Date Fri, 06 Jan 2017 21:56:58 GMT

     [ https://issues.apache.org/jira/browse/HDFS-7964?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Junping Du updated HDFS-7964:
-----------------------------
    Target Version/s: 2.9.0  (was: 2.8.0)

> Add support for async edit logging
> ----------------------------------
>
>                 Key: HDFS-7964
>                 URL: https://issues.apache.org/jira/browse/HDFS-7964
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: namenode
>    Affects Versions: 2.0.2-alpha
>            Reporter: Daryn Sharp
>            Assignee: Daryn Sharp
>             Fix For: 2.8.0, 2.9.0, 3.0.0-alpha1
>
>         Attachments: HDFS-7964-branch-2.7.patch, HDFS-7964-branch-2.8.0.patch, HDFS-7964-rebase.patch,
HDFS-7964.patch, HDFS-7964.patch, HDFS-7964.patch, HDFS-7964.patch
>
>
> Edit logging is a major source of contention within the NN.  LogEdit is called within
the namespace write log, while logSync is called outside of the lock to allow greater concurrency.
 The handler thread remains busy until logSync returns to provide the client with a durability
guarantee for the response.
> Write heavy RPC load and/or slow IO causes handlers to stall in logSync.  Although the
write lock is not held, readers are limited/starved and the call queue fills.  Combining an
edit log thread with postponed RPC responses from HADOOP-10300 will provide the same durability
guarantee but immediately free up the handlers.



--
This message was sent by Atlassian JIRA
(v6.3.4#6332)

---------------------------------------------------------------------
To unsubscribe, e-mail: hdfs-issues-unsubscribe@hadoop.apache.org
For additional commands, e-mail: hdfs-issues-help@hadoop.apache.org


Mime
View raw message