/**
* Action before any real action of modifying column family.
*
* @param env MasterProcedureEnv
* @throws IOException
*/
private void prepareModify(final MasterProcedureEnv env) throws IOException {
// Checks whether the table is allowed to be modified.
MasterDDLOperationHelper.checkTableModifiable(env, tableName);
unmodifiedHTableDescriptor = env.getMasterServices().getTableDescriptors().get(tableName);
if (unmodifiedHTableDescriptor == null) {
throw new IOException("HTableDescriptor missing for " + tableName);
}
if (!unmodifiedHTableDescriptor.hasFamily(cfDescriptor.getName())) {
throw new InvalidFamilyOperationException(
"Family '" + getColumnFamilyName() + "' does not exist, so it cannot be modified");
}
}
/**
* Last action from the procedure - executed when online schema change is supported.
*
* @param env MasterProcedureEnv
* @throws IOException
*/
private void reOpenAllRegionsIfTableIsOnline(final MasterProcedureEnv env) throws IOException {
// This operation only run when the table is enabled.
if (!env.getMasterServices()
.getAssignmentManager()
.getTableStateManager()
.isTableState(getTableName(), TableState.State.ENABLED)) {
return;
}
if (MasterDDLOperationHelper.reOpenAllRegions(env, getTableName(), getRegionInfoList(env))) {
LOG.info("Completed add column family operation on table " + getTableName());
} else {
LOG.warn("Error on reopening the regions on table " + getTableName());
}
}
/**
* Restore the table descriptor back to pre-add
*
* @param env MasterProcedureEnv
* @throws IOException
*/
private void restoreTableDescriptor(final MasterProcedureEnv env) throws IOException {
HTableDescriptor htd = env.getMasterServices().getTableDescriptors().get(tableName);
if (htd.hasFamily(cfDescriptor.getName())) {
// Remove the column family from file system and update the table descriptor to
// the before-add-column-family-state
MasterDDLOperationHelper.deleteColumnFamilyFromFileSystem(
env,
tableName,
getRegionInfoList(env),
cfDescriptor.getName(),
cfDescriptor.isMobEnabled());
env.getMasterServices().getTableDescriptors().add(unmodifiedHTableDescriptor);
// Make sure regions are opened after table descriptor is updated.
reOpenAllRegionsIfTableIsOnline(env);
}
}
/**
* Action before any real action of adding column family.
*
* @param env MasterProcedureEnv
* @throws IOException
*/
private void prepareAdd(final MasterProcedureEnv env) throws IOException {
// Checks whether the table is allowed to be modified.
MasterDDLOperationHelper.checkTableModifiable(env, tableName);
// In order to update the descriptor, we need to retrieve the old descriptor for comparison.
unmodifiedHTableDescriptor = env.getMasterServices().getTableDescriptors().get(tableName);
if (unmodifiedHTableDescriptor == null) {
throw new IOException("HTableDescriptor missing for " + tableName);
}
if (unmodifiedHTableDescriptor.hasFamily(cfDescriptor.getName())) {
throw new InvalidFamilyOperationException(
"Column family '"
+ getColumnFamilyName()
+ "' in table '"
+ tableName
+ "' already exists so cannot be added");
}
}