chunhui shen created HBASE-6204:
-----------------------------------
Summary: Improvement for opening region on the regionserver
Key: HBASE-6204
URL: https://issues.apache.org/jira/browse/HBASE-6204
Project: HBase
Issue Type: Improvement
Components: regionserver
Reporter: chunhui shen
Assignee: chunhui shen
If one table has much regions, like 100k regions.
We would find regionserver open region very slowly.
Opening region in parallel on the rs will be closed to serially.
The following code is the detail:
{code}
public RegionOpeningState openRegion(HRegionInfo region, int
versionOfOfflineNode){
...
HTableDescriptor htd = this.tableDescriptors.get(region.getTableName());
...
public HTableDescriptor get(final String tablename){
...
long modtime = getTableInfoModtime(this.fs, this.rootdir, tablename);
...
}
}
{code}
getTableInfoModtime->getTableInfoPath->getTableInfoPath->FSUtils.listStatus()
if one table has much regions, FSUtils.listStatus() will take much time
How to improve the above code?
I think an easy way is that make a dir (called .tableinfos) in the table dir
and move the files .tableinfo.* to that dir.
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