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https://issues.apache.org/jira/browse/HIVE-10940?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14585367#comment-14585367
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Gopal V commented on HIVE-10940:
--------------------------------
With more logging, it becomes slightly clearer
{code}
2015-06-14 19:00:40,473 INFO [TezChild] io.HiveInputFormat: push down initiated
with filterText = (l_orderkey = 1212000001) filterExpr =
GenericUDFOPEqual(Column[l_orderkey], Const bigint 1212000001)
serializedFilterObj = null serializedFilterExpr =
AQEAamF2YS51dGlsLkFycmF5TGlz9AECAQFvcmcuYXBhY2hlLmhhZG9vcC5oaXZlLnFsLnBsYW4uRXhwck5vZGVDb2x1bW5EZXPjAQFsX29yZGVya2X5AAABbGluZWl0Ze0BAm9yZy5hcGFjaGUuaGFkb29wLmhpdmUuc2VyZGUyLnR5cGVpbmZvLlByaW1pdGl2ZVR5cGVJbmbvAQFiaWdpbvQBA29yZy5hcGFjaGUuaGFkb29wLmhpdmUucWwucGxhbi5FeHByTm9kZUNvbnN0YW50RGVz4wEBAgcJgpztgwkBBG9yZy5hcGFjaGUuaGFkb29wLmhpdmUucWwudWRmLmdlbmVyaWMuR2VuZXJpY1VERk9QRXF1YewBAAABgj0BRVFVQcwBBW9yZy5hcGFjaGUuaGFkb29wLmlvLkJvb2xlYW5Xcml0YWJs5QEAAAECAQFib29sZWHu
filterObject = null
{code}
> HiveInputFormat::pushFilters serializes PPD objects for each getRecordReader
> call
> ---------------------------------------------------------------------------------
>
> Key: HIVE-10940
> URL: https://issues.apache.org/jira/browse/HIVE-10940
> Project: Hive
> Issue Type: Bug
> Components: File Formats
> Affects Versions: 1.2.0
> Reporter: Gopal V
> Assignee: Sergey Shelukhin
> Attachments: HIVE-10940.patch
>
>
> {code}
> String filterText = filterExpr.getExprString();
> String filterExprSerialized = Utilities.serializeExpression(filterExpr);
> {code}
> the serializeExpression initializes Kryo and produces a new packed object for
> every split.
> HiveInputFormat::getRecordReader -> pushProjectionAndFilters -> pushFilters.
> And Kryo is very slow to do this for a large filter clause.
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