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  1. HBase
  2. HBASE-25278

Add option to toggle CACHE_BLOCKS in count.rb

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Details

    • New Feature
    • Status: Resolved
    • Minor
    • Resolution: Fixed
    • None
    • 3.0.0-alpha-1, 2.4.0
    • shell
    • None
    • Reviewed
    • Hide
      A new option, CACHE_BLOCKS, was added to the `count` shell command which will force the data for a table to be loaded into the block cache. By default, the `count` command will not cache any blocks. This option can serve as a means to for a table's data to be loaded into block cache on demand. See the help message on the count shell command for usage details.
      Show
      A new option, CACHE_BLOCKS, was added to the `count` shell command which will force the data for a table to be loaded into the block cache. By default, the `count` command will not cache any blocks. This option can serve as a means to for a table's data to be loaded into block cache on demand. See the help message on the count shell command for usage details.

    Description

      A trick I've found myself doing a couple of times (hat-tip to psomogyi) is to edit table.rb so that the `count` shell command will not instruct RegionServers to not cache any data blocks. This is a quick+dirty way to force a table to be loaded into block cache (i.e. for performance testing).

      We can easily add another option to avoid having to edit the ruby files.

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          is a parent of

          New Feature - A new feature of the product, which has yet to be developed. HBASE-25781 Add cacheBlocks option to RowCounter

          • Minor - Minor loss of function, or other problem where easy workaround is present.
          • In Progress
          links to

          Web Link GitHub Pull Request #2650

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              elserj Josh Elser
              elserj Josh Elser
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