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Posted to hdfs-dev@hadoop.apache.org by "Haohui Mai (JIRA)" <ji...@apache.org> on 2016/01/22 00:43:39 UTC

[jira] [Created] (HDFS-9680) Doing a lsr against WebImageViewer is slow

Haohui Mai created HDFS-9680:
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             Summary: Doing a lsr against WebImageViewer is slow
                 Key: HDFS-9680
                 URL: https://issues.apache.org/jira/browse/HDFS-9680
             Project: Hadoop HDFS
          Issue Type: Improvement
            Reporter: Haohui Mai


We have experienced a performance issue that doing lsr against the WebImageViewer.

For a fsimage that has around 140m files, it takes around ~35 minutes to do the lsr across the live cluster, but ~12 hours to do the same operation against the WebImageViewer.

I believe that the root cause is that WebImageViewer decodes the protobuf messages on-demand which creates a lot of GC pressure. It might be better to decode it at the very beginning.



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