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https://issues.apache.org/jira/browse/HBASE-6459?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13423001#comment-13423001
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zhou wenjian commented on HBASE-6459:
-------------------------------------
I'll give a patch later
> improve speed of create table
> -----------------------------
>
> Key: HBASE-6459
> URL: https://issues.apache.org/jira/browse/HBASE-6459
> Project: HBase
> Issue Type: Bug
> Affects Versions: 0.94.0
> Reporter: zhou wenjian
> Fix For: 0.94.1
>
>
> in CreateTableHandler
> for (int regionIdx = 0; regionIdx < this.newRegions.length; regionIdx++) {
> HRegionInfo newRegion = this.newRegions[regionIdx];
> // 1. Create HRegion
> HRegion region = HRegion.createHRegion(newRegion,
> this.fileSystemManager.getRootDir(), this.conf,
> this.hTableDescriptor, null, false, true);
> regionInfos.add(region.getRegionInfo());
> if (regionIdx % batchSize == 0) {
> // 2. Insert into META
> MetaEditor.addRegionsToMeta(this.catalogTracker, regionInfos);
> regionInfos.clear();
> }
> // 3. Close the new region to flush to disk. Close log file too.
> region.close();
> }
> All the region will be create serially.
> If we have thousands of regions, that will be a huge cost.
> We can improve it by create the region in parallel
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