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From "shanyu zhao (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HADOOP-11629) WASB filesystem should not start BandwidthGaugeUpdater if fs.azure.skip.metrics set to true
Date Tue, 24 Feb 2015 19:47:04 GMT
shanyu zhao created HADOOP-11629:
------------------------------------

             Summary: WASB filesystem should not start BandwidthGaugeUpdater if fs.azure.skip.metrics
set to true
                 Key: HADOOP-11629
                 URL: https://issues.apache.org/jira/browse/HADOOP-11629
             Project: Hadoop Common
          Issue Type: Bug
          Components: tools
    Affects Versions: 2.6.1
            Reporter: shanyu zhao
            Assignee: shanyu zhao


In Hadoop-11248 we added configuration "fs.azure.skip.metrics". If set to true, we do not
register Azure FileSystem metrics with the metrics system. However, BandwidthGaugeUpdater
object is still created in AzureNativeFileSystemStore, resulting in unnecessary threads being
spawned.

Under heavy load the system could be busy dealing with these threads and GC has to work on
removing the thread objects. E.g. When multiple WebHCat clients submitting jobs to WebHCat
server, we observed that the WebHCat server spawns ~400 daemon threads, which slows down the
server and sometimes cause timeout.




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