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  1. MariaDB Server
  2. MDEV-28775

Implement connection manager in Spider

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    Description

      Implement a connection management mechanism to Spider to make the connection handing easy.

      • Each thread gets/returns connections from/to the connection manager. Allocation and deallocation of connections should be done inside the connection manager code.
      • Each connection got from the manager should solely belong to a single thread. Note that, in the current implementation, a single connection is referenced by both ha_spider::conns and SPIDER_TRX::trx_conn_hash and this results in the heap-use-after-free (see linked issues) in many test cases.
      • Spider 10.3-10.9 has two types of connections. One is for SQL and the other is for handler statements. The latter one has been deprecated from 10.7 and deleted by 10.10. So, we only implement the connection manager for SQL connections.
      • For the ease of the development, I recommend creating a patch for 10.10 first and then backporting it to 10.3.

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          relates to

          Bug - A problem which impairs or prevents the functions of the product. MDEV-27902 Spider: Crashes, asserts, hangs, memory corruptions and ASAN heap-use-after-free's

          • Critical - Crashes, loss of data, severe memory leak.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. MDEV-28352 Spider: heap-use-after-free in ha_spider::lock_tables(), heap freed by spider_commit()

          • Critical - Crashes, loss of data, severe memory leak.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. MDEV-28676 Spider: Got error 12701 when reading table (and possible/previous ASAN: heap-use-after-free in ha_spider::external_lock) when using HANDLER

          • Critical - Crashes, loss of data, severe memory leak.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. MDEV-28683 Spider: SIGSEGV in spider_db_direct_delete, SIGSEGV in spider_db_connect, ASAN: heap-use-after-free in spider_db_direct_delete

          • Critical - Crashes, loss of data, severe memory leak.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. MDEV-29962 SIGSEGV in ha_spider::lock_tables on BEGIN after table lock

          • Critical - Crashes, loss of data, severe memory leak.
          • Closed

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              Unassigned Unassigned
              nayuta-yanagisawa Nayuta Yanagisawa (Inactive)
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