Vandana Ayyalasomayajula created HBASE-9343:
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Summary: Implement stateless scanner for Stargate
Key: HBASE-9343
URL: https://issues.apache.org/jira/browse/HBASE-9343
Project: HBase
Issue Type: Improvement
Components: REST
Affects Versions: 0.94.11
Reporter: Vandana Ayyalasomayajula
Assignee: Vandana Ayyalasomayajula
Priority: Minor
The current scanner implementation for scanner stores state and hence not very
suitable for REST server failure scenarios. The current JIRA proposes to
implement a stateless scanner. In the first version of the patch, a new
resource class "ScanResource" has been added and all the scan parameters will
be specified as query params.
The following are the scan parameters
startrow - The start row for the scan.
endrow - The end row for the scan.
columns - The columns to scan.
starttime, endtime - To only retrieve columns within a specific range of
version timestamps,both start and end time must be specified.
maxversions - To limit the number of versions of each column to be returned.
batchsize - To limit the maximum number of values returned for each call to
next().
limit - The number of rows to return in the scan operation.
More on start row, end row and limit parameters.
1. If start row, end row and limit not specified, then the whole table will be
scanned.
2. If start row and limit (say N) is specified, then the scan operation will
return N rows from the start row specified.
3. If only limit parameter is specified, then the scan operation will return N
rows from the start of the table.
4. If limit and end row are specified, then the scan operation will return N
rows from start of table till the end row. If the end row is
reached before N rows ( say M and M < N ), then M rows will be returned to
the user.
5. If start row, end row and limit (say N ) are specified and N < number of
rows between start row and end row, then N rows from start row
will be returned to the user. If N > (number of rows between start row and
end row (say M), then M number of rows will be returned to the
user.
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