1. 27 Oct, 2009 6 commits
  2. 26 Oct, 2009 2 commits
    • Dmitry Lenev's avatar
      Fix for bug #45143 "All connections hang on concurrent ALTER TABLE". · dfa2acb1
      Dmitry Lenev authored
      Concurrent execution of statements which require non-table-level
      write locks on several instances of the same table (such as
      SELECT ... FOR UPDATE which uses same InnoDB table twice or a DML
      statement which invokes trigger which tries to update same InnoDB
      table directly and through stored function) and statements which
      required table-level locks on this table (e.g. LOCK TABLE ... WRITE,
      ALTER TABLE, ...) might have resulted in a deadlock.
      
      The problem occured when a thread tried to acquire write lock
      (TL_WRITE_ALLOW_WRITE) on the table but had to wait since there was
      a pending write lock (TL_WRITE, TL_WRITE_ALLOW_READ) on this table
      and we failed to detect that this thread already had another instance
      of write lock on it (so in fact we were trying to acquire recursive
      lock) because there was also another thread holding write lock on the
      table (also TL_WRITE_ALLOW_WRITE). When the latter thread released
      its lock neither the first thread nor the thread trying to acquire
      TL_WRITE/TL_WRITE_ALLOW_READ were woken up (as table was still write
      locked by the first thread) so we ended up with a deadlock.
      
      This patch solves this problem by ensuring that thread which
      already has write lock on the table won't wait when it tries
      to acquire second write lock on the same table.
      dfa2acb1
    • Sergey Glukhov's avatar
      Bug#35427 INFORMATION_SCHEMA.TABLES.TABLE_CATALOG is NULL, should be "def" · c995288a
      Sergey Glukhov authored
      additional fix(Betony)
      c995288a
  3. 25 Oct, 2009 1 commit
  4. 23 Oct, 2009 15 commits
  5. 22 Oct, 2009 16 commits