Guanghao Zhang created HBASE-15885:
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Summary: Compute StoreFile HDFS Blocks Distribution when need it
Key: HBASE-15885
URL: https://issues.apache.org/jira/browse/HBASE-15885
Project: HBase
Issue Type: Improvement
Components: HFile
Affects Versions: 2.0.0
Reporter: Guanghao Zhang
Now when open a StoreFileReader, it always need to compute HDFS blocks
distribution. But when balance a region, it will increase the region not
serving time. Because it need first close region on rs A, then open it on rs B.
When close region, it first preFlush, then flush the new update to a new store
file. The new store file will first be flushed to tmp directory, then move it
to column family directory. These need open StoreFileReader twice which means
it need compute HDFS blocks distribution twice. When open region on rs B, it
need open StoreFileReader and compute HDFS blocks distribution too. So when
balance a region, it need compute HDFS blocks distribution three times for per
new store file. This will increase the region not serving time and we don't
need compute HDFS blocks distribution when close a region.
The related three methods in HStore.
1. validateStoreFile(...)
2. commitFile(...)
3. openStoreFiles(...)
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