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  1. Couchbase Server
  2. MB-20298

Query Service: Don't write buffer to /tmp

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    Description

      "If there is a large scan, gsiClient buffer the scan results to /tmp."
      This is allowed to grow to 5GB of disk usage before it errors.

      We've seen issues when other components use /tmp, see MB-11560

      Writing large amounts of data to /tmp is *bad* for a number of reasons:

      1) Nowhere in our documentation or install guide do we mention that /tmp is needed by Couchbase.
      2) If /tmp isn't writable, could the query results be lost ?
      3) Are there built in checks on available disk space in /tmp ?
      4) Related to (1), while users typically configure a fast IO subsystem for the data and index directories they have no reason to do so for /tmp - and so this may be on a slow subsystem, creating a bottleneck for IO
      5) Also related to (1), we don't normally direct customers to monitor /tmp for IO and space.

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          relates to

          Improvement - An improvement or enhancement to an existing feature or task. MB-11560 Compaction: Don't write to /tmp

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

          Improvement - An improvement or enhancement to an existing feature or task. MB-25804 Indexer/GSI client should use configured location/quota for backfill files

          • Major - Major loss of function.
          • Resolved

          Improvement - An improvement or enhancement to an existing feature or task. MB-25805 Provide options in Web Console to specify query_tmpspace path & quota

          • Major - Major loss of function.
          • Resolved

          Improvement - An improvement or enhancement to an existing feature or task. MB-25806 Allow REST API to set query-tmpspace path/quote

          • Major - Major loss of function.
          • Resolved

          Improvement - An improvement or enhancement to an existing feature or task. DOC-2631 Document query_tmpspace & related quota settings and backfills

          • Major - Major loss of function.
          • Closed
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              ajay.bhullar Ajay Bhullar
              ianmccloy Ian McCloy (Inactive)
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