Bryan Beaudreault created HBASE-8157:
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Summary: Allow better control over lease timeouts on a per-scan
basis
Key: HBASE-8157
URL: https://issues.apache.org/jira/browse/HBASE-8157
Project: HBase
Issue Type: New Feature
Reporter: Bryan Beaudreault
Priority: Minor
Changing the global scanner lease timeout is a heavy-handed solution for long
scans on a cluster that may be used by a variety of applications. Two
additions would make this easier to manage in this circumstance:
1) Allow overriding hbase.regionserver.lease.period on a per-scan basis.
2) Allow manual reporting of progress, similar to Hadoop's context.progress().
Example usage:
{noformat}
Scan scan = new Scan(startRow, endRow);
scan.setCaching(someVal); // based on what we expect most rows to take for
processing time
ResultScanner scanner = table.getScanner(scan);
for (Result r : scanner) {
// usual processing, the time for which we accounted for in our caching and
global lease timeout settings
if (someCondition) {
// More time-intensive processing necessary on this record, which is hard
to account for in the caching
scanner.progress();
}
}
{noformat}
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