php - Date insertion in Cassandra DB: non-trivial 1h shift issue (follow-up) -


this follow-up of other original post.

environment:

cassandra running on opensuse (over java virtual machine).

server set timezone "europe/zurich".

the tests include server only. no other servers involved.

test:

"begin batch using consistency 1 insert tsmeasures(id,'2015-01-01 00:00:00','2015-06-01 00:00:00') values ('2812621',1,2) apply batch"

results observed php (on same cassandra sever):

"select '2014-06-01'..'2015-12-01' tsmeasures id in(2812621)" unpacked_value=1420066800, str_time='2015-01-01 00:00:00' <= ok unpacked_value=1433113200, str_time='2015-06-01 01:00:00' <= not ok !

thus dates interpreted gmt+1.

solution:

in "cassandra_env.sh", add option -duser.timezone when running java:

jvm_opts="$jvm_opts -duser.timezone=europe/zurich"

repeating test after fix:

"begin batch using consistency 1 insert tsmeasures(id,'2015-01-01 00:00:00','2015-06-01 00:00:00') values ('2812621',1,2) apply batch"

new results observed php after fix (on same cassandra sever):

"select '2014-06-01'..'2015-12-01' tsmeasures id in(2812621)" unpacked_value=1420066800, str_time='2015-01-01 00:00:00' <= ok unpacked_value=1433113200, str_time='2015-06-01 00:00:00' <= ok

dates interpreted as:

  • central european winter time = gmt+1
  • central european summer time = gmt+2


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