Norberto Leite created OAK-2284:
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Summary: Better locality for blobs collections over sharding
Key: OAK-2284
URL: https://issues.apache.org/jira/browse/OAK-2284
Project: Jackrabbit Oak
Issue Type: Improvement
Components: blob, mongomk
Affects Versions: 1.1.2
Reporter: Norberto Leite
Currently when use oak with mongo mk for blobs storage we can easily end up
with all different chunks of a binary streams scattered across the shards.
Now this is not ideal since it generates a large number of scattered gather
queries over the shards for each individual files.
To allow better locality I propose the addition of another field called
{{_anchor}}
This anchor field will be generated by the inverse order of the current
timestamp of beginning of the storage of the file:
{code}
//Milliseconds Second Minute HH
SimpleDateFormat sdf = new SimpleDateFormat("SSSssmmHH");
//store the parsed integer of this value for more storage efficiency
String a = asdf.format(new Date());
int _anchor = Integer.parseInt(asdf.format(new Date()));
{code}
Pull request is on the making!
N.
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