Displaying #cassandra-dev/2017-08-23.log:

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Wed Aug 23 00:17:10 2017  krut:hkroger: certainly sounds like a fun byteman exercise
Wed Aug 23 00:17:52 2017  krut:i'm no byteman expert but i'll have a glance
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Wed Aug 23 06:17:43 2017  mck_sw:to talk to myself: i read a bit too quickly over your "When we test C*3 in shadow cluster" :-)
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Wed Aug 23 11:01:53 2017  hkroger:I would need some background information about the tombstone histogram related to the corrupted tables
Wed Aug 23 11:02:30 2017  hkroger:Why are tombstone histongrams still being updated by some other thread when sstable stats are being written
Wed Aug 23 11:02:49 2017  hkroger:It's easy to fix the serialization
Wed Aug 23 11:03:05 2017  hkroger:but could there be a bigger problem that the data is still being edited ?
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Wed Aug 23 13:01:59 2017  hkroger:krut: the corruption problem is real but I cannot reach anyone who could help out here
Wed Aug 23 13:02:06 2017  hkroger:I tried sending email to dev list as well
Wed Aug 23 13:02:26 2017  hkroger:but to no avail
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Wed Aug 23 21:17:56 2017  hkroger:jeffj: Hello
Wed Aug 23 21:18:36 2017  hkroger:About those streaminghistogram problems
Wed Aug 23 21:19:44 2017  hkroger:Do you know why tombstone histograms are still being edited when an sstable is being written (the race condition problem) ?
Wed Aug 23 21:20:17 2017  hkroger:Question number 2: If we can fix the stats file by making size match the count of elements, is there any problem by reading all those elements into the histogram?
Wed Aug 23 21:20:30 2017  hkroger:or should the extra elements of the histogram be ignored?
Wed Aug 23 21:22:31 2017  jeffj:hkroger: i dont, i presume it's early open, when i wrote 13038 it didnt occur to me that it would be accessed by more than one thread, so i am not at all sure which other thread is hitting it and causing that problem
Wed Aug 23 21:23:12 2017  jeffj:for question #2, if you make it match, i suspect it'll be fine. assuming it's really mismatched for the reason you think it is.
Wed Aug 23 21:24:05 2017  hkroger:is it dangerous if the tombstone histogram is a bit off ?
Wed Aug 23 21:27:02 2017  hkroger:I am thinking about fixing the broken files
Wed Aug 23 21:38:05 2017  jeffj:tombstone histogram is primarily used for knowing when to compact away mostly-deleted data
Wed Aug 23 21:38:12 2017  jeffj:if it's off, it'll just make it compact more or less frequently
Wed Aug 23 21:46:11 2017  hkroger:ok, that's what I thought
Wed Aug 23 21:46:12 2017  hkroger:so good
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Wed Aug 23 22:00:47 2017  jeffj:tbh, if you're able to fix the histogram so it's not seen as corrupt, just immediately start the server and run user defined compaction on that sstable,
Wed Aug 23 22:00:53 2017  jeffj:and rewrite it with a new clean histogram
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