Filter HFiles based on TTL
--------------------------
Key: HBASE-5010
URL: https://issues.apache.org/jira/browse/HBASE-5010
Project: HBase
Issue Type: Bug
Reporter: Mikhail Bautin
Assignee: Mikhail Bautin
In ScanWildcardColumnTracker we have
{
this.oldestStamp = EnvironmentEdgeManager.currentTimeMillis() - ttl;
...
private boolean isExpired(long timestamp) {
return timestamp < oldestStamp;
}
}
but this time range filtering does not participate in HFile selection. In one
real case this caused next() calls to time out because all KVs in a table got
expired, but next() had to iterate over the whole table to find that out. We
should be able to filter out those HFiles right away. I think a reasonable
approach is to add a "default timerange filter" to every scan for a CF with a
finite TTL and utilize existing filtering in
StoreFile.Reader.passesTimerangeFilter.
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