question: startup from a 2.6-layout that already has unique storage ids does not regenerate the storage ids . test case for hdfs-7575 . concode_field_sep PlaceHolder placeHolder concode_field_sep void runLayoutUpgradeTest concode_elem_sep void initStorageDirs concode_elem_sep void upgradeAndVerify concode_elem_sep void testUpgradeFrom22FixesStorageIDs concode_elem_sep void testUpgradeFrom22via26FixesStorageIDs
target: void function ( ) { runLayoutUpgradeTest ( GenericTestUtils . getMethodName ( ) , "srini_string" ) ; }