NihalJain commented on code in PR #6656:
URL: https://github.com/apache/hbase/pull/6656#discussion_r1942288483
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hbase-shell/src/main/ruby/hbase/table.rb:
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@@ -321,24 +321,21 @@ def _append_internal(row, column, value, args = {})
def _count_internal(interval = 1000, scan = nil, cacheBlocks=false)
raise(ArgumentError, 'Scan argument should be
org.apache.hadoop.hbase.client.Scan') \
unless scan.nil? || scan.is_a?(org.apache.hadoop.hbase.client.Scan)
- # We can safely set scanner caching with the first key only filter
- if scan.nil?
- scan = org.apache.hadoop.hbase.client.Scan.new
- scan.setCacheBlocks(cacheBlocks)
- scan.setCaching(10)
- scan.setFilter(org.apache.hadoop.hbase.filter.FirstKeyOnlyFilter.new)
- else
- scan.setCacheBlocks(cacheBlocks)
- filter = scan.getFilter
- firstKeyOnlyFilter =
org.apache.hadoop.hbase.filter.FirstKeyOnlyFilter.new
- if filter.nil?
- scan.setFilter(firstKeyOnlyFilter)
- else
- firstKeyOnlyFilter.setReversed(filter.isReversed)
- scan.setFilter(org.apache.hadoop.hbase.filter.FilterList.new(filter,
firstKeyOnlyFilter))
- end
+ scan ||= org.apache.hadoop.hbase.client.Scan.new
+ scan.setCacheBlocks(cacheBlocks)
+
+ # Optimize counting by using FirstKeyOnlyFilter and KeyOnlyFilter
+ filters = [
+ org.apache.hadoop.hbase.filter.FirstKeyOnlyFilter.new,
+ org.apache.hadoop.hbase.filter.KeyOnlyFilter.new
Review Comment:
Interesting! May be we would want to re-visit RowCounter mapreduce job (with
another jira of course) post this change.
Ref:
https://github.com/apache/hbase/blob/master/hbase-mapreduce/src/main/java/org/apache/hadoop/hbase/mapreduce/RowCounter.java#L318
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