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From "Erik Krogen (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-10896) Move lock logging logic from FSNamesystem into FSNamesystemLock
Date Fri, 30 Sep 2016 17:01:20 GMT

     [ https://issues.apache.org/jira/browse/HDFS-10896?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Erik Krogen updated HDFS-10896:
-------------------------------
    Attachment: HDFS-10896.004.patch

After looking at HDFS-5239 it turns out the lack of documentation for {{dfs.namenode.fslock.fair}}
was intentional. Attaching v004 patch which leaves it undocumented. 

> Move lock logging logic from FSNamesystem into FSNamesystemLock
> ---------------------------------------------------------------
>
>                 Key: HDFS-10896
>                 URL: https://issues.apache.org/jira/browse/HDFS-10896
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: namenode
>            Reporter: Erik Krogen
>            Assignee: Erik Krogen
>              Labels: logging, namenode
>         Attachments: HDFS-10896.000.patch, HDFS-10896.001.patch, HDFS-10896.002.patch,
HDFS-10896.003.patch, HDFS-10896.004.patch
>
>
> There are a number of tickets (HDFS-10742, HDFS-10817, HDFS-10713, this subtask's story
HDFS-10475) which are adding/improving logging/metrics around the {{FSNamesystemLock}}. All
of this is done in {{FSNamesystem}} right now, which is polluting the namesystem with ThreadLocal
variables, timing counters, etc. which are only relevant to the lock itself and the number
of these increases as the logging/metrics become more sophisticated. It would be best to move
these all into FSNamesystemLock to keep the metrics/logging tied directly to the item of interest.




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