List of usage examples for org.apache.hadoop.yarn.server.records Version equals
@Override public boolean equals(Object obj)
From source file:org.apache.tez.auxservices.ShuffleHandler.java
License:Apache License
/** * 1) Versioning scheme: major.minor. For e.g. 1.0, 1.1, 1.2...1.25, 2.0 etc. * 2) Any incompatible change of DB schema is a major upgrade, and any * compatible change of DB schema 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 shuffle info or remove incompatible old state. *//*from ww w. java 2 s. com*/ private void checkVersion() throws IOException { Version loadedVersion = loadVersion(); LOG.info("Loaded state DB schema version info " + loadedVersion); if (loadedVersion.equals(getCurrentVersion())) { return; } if (loadedVersion.isCompatibleTo(getCurrentVersion())) { LOG.info("Storing state DB schedma version info " + getCurrentVersion()); storeVersion(); } else { throw new IOException("Incompatible version for state DB schema: expecting DB schema version " + getCurrentVersion() + ", but loading version " + loadedVersion); } }