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From "Hao Chen (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-6914) Resolve huge memory consumption Issue with OIV processing PB-based fsimages
Date Fri, 22 Aug 2014 09:30:11 GMT
Hao Chen created HDFS-6914:
------------------------------

             Summary: Resolve huge memory consumption Issue with OIV processing PB-based fsimages
                 Key: HDFS-6914
                 URL: https://issues.apache.org/jira/browse/HDFS-6914
             Project: Hadoop HDFS
          Issue Type: Bug
    Affects Versions: 2.4.1
            Reporter: Hao Chen
             Fix For: 2.5.1


For better managing and supporting a lot of large hadoop clusters in production, we internally
need to automatically export fsimage to delimited text files in LSR style and then analyse
with hive or pig or build system metrics for real-time analyzing. 

However  due to the internal layout changes introduced by the protobuf-based fsimage, OIV
processing program consumes excessive amount of memory. For example, in order to export the
fsimage in size of 8GB, it should have taken about 85GB memory which is really not reasonable
and impacted performance of other services badly in the same server.

To resolve above problem, I submit this patch which will reduce memory consumption of OIV
LSR processing by 50%.



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