Examples with MMetastoreDBProperties org.apache.hadoop.hive.metastore.model.MMetastoreDBProperties used on opensource projects

Example 1 with MMetastoreDBProperties

use of org.apache.hadoop.hive.metastore.model.MMetastoreDBProperties in project hive by apache.

the class ObjectStore method createDbGuidAndPersist.

private String createDbGuidAndPersist() throws MetaException {
    boolean success = false;
    Query query = null;
    try {
        openTransaction();
        MMetastoreDBProperties prop = new MMetastoreDBProperties();
        prop.setPropertykey("guid");
        final String guid = UUID.randomUUID().toString();
        LOG.debug("Attempting to add a guid {} for the metastore db", guid);
        prop.setPropertyValue(guid);
        prop.setDescription("Metastore DB GUID generated on " + LocalDateTime.now().format(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss.SSS")));
        pm.makePersistent(prop);
        success = commitTransaction();
        if (success) {
            LOG.info("Metastore db guid {} created successfully", guid);
            return guid;
        }
    } catch (Exception e) {
        LOG.warn("Metastore db guid creation failed", e);
    } finally {
        rollbackAndCleanup(success, query);
    }
    // it possible that some other HMS instance could have created the guid
    // at the same time due which this instance could not create a guid above
    // in such case return the guid already generated
    final String guid = getGuidFromDB();
    if (guid == null) {
        throw new MetaException("Unable to create or fetch the metastore database uuid");
    }
    return guid;
}

Example 2 with MMetastoreDBProperties

use of org.apache.hadoop.hive.metastore.model.MMetastoreDBProperties in project hive by apache.

the class ObjectStore method getGuidFromDB.

private String getGuidFromDB() throws MetaException {
    boolean success = false;
    Query query = null;
    try {
        openTransaction();
        query = pm.newQuery(MMetastoreDBProperties.class, "this.propertyKey == key");
        query.declareParameters("java.lang.String key");
        Collection<MMetastoreDBProperties> names = (Collection<MMetastoreDBProperties>) query.execute("guid");
        List<String> uuids = new ArrayList<>();
        for (Iterator<MMetastoreDBProperties> i = names.iterator(); i.hasNext(); ) {
            String uuid = i.next().getPropertyValue();
            LOG.debug("Found guid {}", uuid);
            uuids.add(uuid);
        }
        success = commitTransaction();
        if (uuids.size() > 1) {
            throw new MetaException("Multiple uuids found");
        }
        if (!uuids.isEmpty()) {
            LOG.debug("Returning guid of metastore db : {}", uuids.get(0));
            return uuids.get(0);
        }
    } finally {
        rollbackAndCleanup(success, query);
    }
    LOG.warn("Guid for metastore db not found");
    return null;
}