/** * 1) Versioning timeline store: major.minor. For e.g. 1.0, 1.1, 1.2...1.25, * 2.0 etc. 2) Any incompatible change of TS-store is a major upgrade, and any * compatible change of TS-store is a minor upgrade. 3) Within a minor * upgrade, say 1.1 to 1.2: overwrite the version info and proceed as normal. * 4) Within a major upgrade, say 1.2 to 2.0: throw exception and indicate * user to use a separate upgrade tool to upgrade timeline store or remove * incompatible old state. */ private void checkVersion() throws IOException { Version loadedVersion = loadVersion(); LOG.info("Loaded timeline store version info " + loadedVersion); if (loadedVersion.equals(getCurrentVersion())) { return; } if (loadedVersion.isCompatibleTo(getCurrentVersion())) { LOG.info("Storing timeline store version info " + getCurrentVersion()); dbStoreVersion(CURRENT_VERSION_INFO); } else { String incompatibleMessage = "Incompatible version for timeline store: " + "expecting version " + getCurrentVersion() + ", but loading version " + loadedVersion; LOG.error(incompatibleMessage); throw new IOException(incompatibleMessage); } }
@Test public void testCheckVersion() throws IOException { RollingLevelDBTimelineStore dbStore = (RollingLevelDBTimelineStore) store; // default version Version defaultVersion = dbStore.getCurrentVersion(); Assert.assertEquals(defaultVersion, dbStore.loadVersion()); // compatible version Version compatibleVersion = Version.newInstance(defaultVersion.getMajorVersion(), defaultVersion.getMinorVersion() + 2); dbStore.storeVersion(compatibleVersion); Assert.assertEquals(compatibleVersion, dbStore.loadVersion()); restartTimelineStore(); dbStore = (RollingLevelDBTimelineStore) store; // overwrite the compatible version Assert.assertEquals(defaultVersion, dbStore.loadVersion()); // incompatible version Version incompatibleVersion = Version.newInstance(defaultVersion.getMajorVersion() + 1, defaultVersion.getMinorVersion()); dbStore.storeVersion(incompatibleVersion); try { restartTimelineStore(); Assert.fail("Incompatible version, should expect fail here."); } catch (ServiceStateException e) { Assert.assertTrue("Exception message mismatch", e.getMessage().contains("Incompatible version for timeline store")); } }