14 Matching Annotations
  1. May 2025
  2. Apr 2025
    1. 日志是如何清理的呢?

      1. deletion策略,正常情况下,根据日志的配置,自动进行最大留存时间、最大留存大小的清理,以segment为单位,具体看kafka-log-retention任务
      2. compaction策略,topic可以设置compaction策略为compaction、delete + compaction,这样的话LogCleaner会定时进行compaction。优化策略,segments氛围cleaned和uncleaned,从uncleaned中遍历消息(在逻辑中可以根据需求读取需要的大小以节省内存)构建offsetMap来存储这一段中最新的key的offset,而从头遍历segments,清理掉offsetMap中已有的已有的消息(也就是最新消息)
  3. Nov 2024
  4. Oct 2024
    1. Cakedinkmayberemovedwithtypeputty,alcohol,carbontetrachloride,oroneoftheproprietarydry-cleaningfluids,appliedwithabrush.Pressthetypeputtyontothetype,peelitoff,andthecakedinkcomeswithit.Ifyouusealiquid,firstliftthetypeandputpaperunderitto prevent dirt from dripping into the machine. When using type-cleaning fluid, be sure toWipe the type dry with a cloth before using the place paper under type to prevent dirt frommachine again.

      dry cleaning solvents in 1941 were likely Varsol or Stoddard's Formula.

      compare to trichloroethane<br /> https://hypothes.is/a/EyBIAFXAEe-AcP-Atlj_aQ

      Note discontinuation of carbon tetrachloride<br /> https://hypothes.is/a/bfdi_I90Ee-OQLN0HpsE7Q

    1. Hints for a Happy Typewriter<br /> Bryan Kravitz, Nancy Gorrell, 1983<br /> https://typewriterdatabase.com/1983-Hints4HappyTypewriter.index.manual

      Some good, basic home care and use from 1983. Home mechanics in 2024 are probably capable of a bit more without the backstop of a typewriter mechanic.

      This guide suggest the use of solvents like alcohol or trichloroethane for cleaning type slugs and internals. Note that trichloroethane manufacture and use has diminished significantly since 1996 when it was identified by the Montreal Protocol as a contributor to ozone depletion.

    1. 1962 Vintage IBM Typewriter Training Film IBM Selectric Proper Typing Procedures, w/ Bud McDole by [[Computer History Archives Project]]

      Right at the Typewriter. 16 mm. San Francisco, CA: KQED, 1962. https://www.youtube.com/watch?v=sPfHAW_OfGo.

      On manual typewriters one "snaps" the keys while on an electric keyboard one "taps" the keys for maximum speed and accuracy.

      Overview of functionality of an IBM typewriter.

      To add longevity to one's carbon papers they should be rotated both top to bottom and front to back within one's packs.

      Use plastic type cleaner, meant for cleaning type slugs, to clean the excess ink from a typewriter. Form it into a point and press it to the letter to erase several times. Then erase with eraser shield and eraser.

      To type to the very bottom of the page, particularly with a carbon pack, to prevent slippage at the bottom, insert a "trailer sheet" about halfway down the first page. Insert it at the back of the pack just behind the original and between the first carbon sheet.

      For typing small sheets of paper (index cards) fold a pleat into a regular sheet of paper and use the lip to hold the smaller sheet you're typing on.

      To more quickly type envelopes, do the first then reverse the platen so that only about an inch of the top of the envelope is visible. Then insert the next envelope behind the first and continue reversing the platen. This will allow the finished envelopes to stack at the paper table and speed the threading and typing of envelopes in rapid succession.

      Use of the divots on the typing guide for making horizontal or vertical lines while moving the carriage or rotating the platen respectively.

      How to change the typeball and the ribbon cartridge on the IBM selectric.

  5. Sep 2024
    1. Fossilized Masking Tape Removed Cleaned from Typewriter Body by [[Phoenix Typewriter]]

      The paint on the metal of the SMC 6 series typewriters will generally stand up well to lacquer thinner and along with scratching can be used to remove the old residual masking tape often found on these typewriters.

      WD-40, gun bore cleaner, and Simple Green generally don't do much to this sort of tape residue.

  6. May 2024
  7. Apr 2024
  8. Mar 2024
  9. Mar 2021
  10. Feb 2021