Maximum dbcache too small #31326

issue pbies openend this issue on November 19, 2024
  1. pbies commented at 10:31 pm on November 19, 2024: none

    Is there an existing issue for this?

    • I have searched the existing issues

    Current behaviour

    28.0 gives ‘out of space’ and hangs when dbcache is set to 16384 and full chainstate -reindex is run.

    Expected behaviour

    Should -reindex complete the reindexing.

    Steps to reproduce

    Have whole blockchain on disk, txindex=1, dbcache=16384 and reindex whole chainstate with command line -reindex option.

    Relevant log output

    2024-11-18T17:15:31Z Cache size (16396074160) exceeds total space (16395641600)

    How did you obtain Bitcoin Core

    Pre-built binaries

    What version of Bitcoin Core are you using?

    28.0

    Operating system and version

    Windows 10 Pro x64 PL

    Machine specifications

    No response

  2. pbies commented at 10:33 pm on November 19, 2024: none
    Seems like the issue is also here: https://github.com/bitcoin/bitcoin/issues/27599
  3. achow101 commented at 10:53 pm on November 19, 2024: member

    The “hanging” is caused by the cache flushing. For a 16GB cache, that can take quite a while, depending on your hardware. The only solution is to be patient and wait for it to finish flushing. If you turn on additional debug logging, you should see consistent log lines about it flushing entries to disk.

    Increasing the cache will only make that “hanging” worse as the cache will be even bigger and so even more data to be flushed at once.

    #28358 dropped the dbcache limit, but that won’t make this go away, it just means that once the node exits IBD, it’ll spend a long time flushing the cache.

  4. maflcko commented at 1:07 pm on November 25, 2024: member

    Seems like the issue is also here: #27599

    Closing for now as duplicate. Leave a comment, if this is not a duplicate, or if you have any other questions.

    If you have more relevant details to add to #27599, please do so.

  5. maflcko closed this on Nov 25, 2024

  6. andrewtoth commented at 6:59 pm on November 27, 2024: contributor
    The hanging will be fixed by #30611. It will also be mitigated by #30039.

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