Phil Yang created HBASE-17931:
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Summary: Rolling upgrade on branch-1 and master
Key: HBASE-17931
URL: https://issues.apache.org/jira/browse/HBASE-17931
Project: HBase
Issue Type: Bug
Components: scan
Affects Versions: 1.4.0
Reporter: Phil Yang
Priority: Blocker
Fix For: 2.0.0
In branch-1 and master we have some improvement and new features on scanning
which is not compatible.
A client of old version to a server of new version is compatible (must be a bug
if not, maybe need some test?).
A client of new version can not read from a server of old version, which is ok
for major/minor upgrade. But RS also use scan to read meta. If meta table is in
RS of old version, all RSs of new version may have trouble while scanning meta
table.
So we should make sure meta table always in servers of new version. Force meta
table in Master or assign meta table in region servers with latest version?
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