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[EP-tech] EPrints v3.1.2 migration to the latest version

CAUTION: This e-mail originated outside the University of Southampton.

Hello! I am trying to migrate EPrints v3.1.2 to the latest version. As
I understand it is impossible to migrate straight to v3.4.2, so first
I try to install v3.3.16 and upgrade repository to this version, but
there is few errors in output of 'epadmin upgrade REPOID'

Added dataset upload_progress
DBD::mysql::db do failed: Can't create table 'REPOID.#sql-10710_38'
(errno: 150) at /usr/share/eprints/bin/../perl_lib/EPrints/Database.pm
line 3052, <STDIN> line 1.
SQL ERROR (do): ALTER TABLE `subject_name_sortvalue` ADD CONSTRAINT
`subject_name_sortvalue_fk` FOREIGN KEY(`subjectid`) REFERENCES
`subject`(`subjectid`) ON DELETE CASCADE
SQL ERROR (do): Can't create table 'REPOID.#sql-10710_38' (errno: 150) (#1005)

Later there is:

Upgrading dataset file
Upgrading `file` by insertion
DBD::mysql::db do failed: Cannot delete or update a parent row: a
foreign key constraint fails at
/usr/share/eprints/bin/../perl_lib/EPrints/Database.pm line 3052,
<STDIN> line 1.
SQL ERROR (do): DROP TABLE IF EXISTS `old_file`
SQL ERROR (do): Cannot delete or update a parent row: a foreign key
constraint fails (#1217)

Upgrading dataset upload_progress
Upgrading `upload_progress` by insertion
DBD::mysql::db do failed: Cannot delete or update a parent row: a
foreign key constraint fails at
/usr/share/eprints/bin/../perl_lib/EPrints/Database.pm line 3052,
<STDIN> line 1.
SQL ERROR (do): DROP TABLE IF EXISTS `old_upload_progress`
SQL ERROR (do): Cannot delete or update a parent row: a foreign key
constraint fails (#1217)

Upgrading rindex and grep tables for subject
DBD::mysql::st execute failed: Table 'REPOID.subject__rindex' doesn't
exist at /usr/share/eprints/perl_lib/EPrints/Database/mysql.pm line
423, <STDIN> line 1.
DBD::mysql::st fetch failed: fetch() without execute() at
/usr/share/eprints/perl_lib/EPrints/Database/mysql.pm line 426,
<STDIN> line 1.
DBD::mysql::st execute failed: Table 'REPOID.subject__rindex' doesn't
exist at /usr/share/eprints/bin/epadmin line 2769, <STDIN> line 1.
DBD::mysql::st fetch failed: fetch() without execute() at
/usr/share/eprints/bin/epadmin line 2770, <STDIN> line 1.
DBD::mysql::db do failed: Table 'REPOID.subject__rindex' doesn't exist
at /usr/share/eprints/bin/../perl_lib/EPrints/Database.pm line 3052,
<STDIN> line 1.
SQL ERROR (do): ALTER IGNORE TABLE subject__rindex MODIFY field
VARCHAR(64) CHARACTER SET UTF8, MODIFY word VARCHAR(128) CHARACTER SET
UTF8, DEFAULT CHARACTER SET UTF8, ADD PRIMARY
KEY(field,word,`subjectid`)
SQL ERROR (do): Table 'REPOID.subject__rindex' doesn't exist (#1146)

And everything stops here:
Upgrading dataset metafield

------------------------------------------------------------------
---------------- EPrints System Error ----------------------------
------------------------------------------------------------------
An unexpected error occurred while attempting to convert tables to UTF-8.

------------------------------------------------------------------
EPrints System Error inducing stack dump
 at /usr/share/eprints/bin/../perl_lib/EPrints.pm line 147, <STDIN> line 1.
        EPrints::abort() called at /usr/share/eprints/bin/epadmin line 2753
        main::upgrade_mysql_charset('EPrints::Repository=HASH(0xb9fc80)',
'EPrints::Database::mysql=HASH(0x384b458)') called at
/usr/share/eprints/bin/epadmin line 3008
        main::upgrade_3_1_2_to_3_2_0('EPrints::Repository=HASH(0xb9fc80)',
'EPrints::Database::mysql=HASH(0x384b458)') called at
/usr/share/eprints/bin/epadmin line 2887
        main::upgrade('REPOID') called at
/usr/share/eprints/bin/epadmin line 320

How to fix these errors and complete repository upgrade?