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https://issues.apache.org/jira/browse/HIVE-25576?focusedWorklogId=664847&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-664847
]
ASF GitHub Bot logged work on HIVE-25576:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 13/Oct/21 18:20
Start Date: 13/Oct/21 18:20
Worklog Time Spent: 10m
Work Description: zabetak commented on a change in pull request #2690:
URL: https://github.com/apache/hive/pull/2690#discussion_r728036705
##########
File path: common/src/java/org/apache/hadoop/hive/conf/HiveConf.java
##########
@@ -3711,6 +3711,11 @@ private static void
populateLlapDaemonVarsSet(Set<String> llapDaemonVarsSetLocal
"1800s", new TimeValidator(TimeUnit.SECONDS),
"Interval to synchronize privileges from external authorizer
periodically in HS2"),
+ HIVE_LEGACY_TIMEPARSER_POLICY("hive.legacy.timeparser.policy", false,
Review comment:
How about renaming to `hive.datetime.formatter.legacy.enabled`? That way
we create a `hive.datetime` namespace which we can use for other props in the
future.
##########
File path: common/src/java/org/apache/hadoop/hive/conf/HiveConf.java
##########
@@ -3711,6 +3711,11 @@ private static void
populateLlapDaemonVarsSet(Set<String> llapDaemonVarsSetLocal
"1800s", new TimeValidator(TimeUnit.SECONDS),
"Interval to synchronize privileges from external authorizer
periodically in HS2"),
+ HIVE_LEGACY_TIMEPARSER_POLICY("hive.legacy.timeparser.policy", false,
Review comment:
One thing that I am a bit skeptical about is that when I search for
`SimpleDateFormat` or `DateTimeFormatter` in the repo I find occurrences in
various places (including other UDFs). I am wondering what should we do with
the other parts using new/old formatters. The current description of the
property makes me believe that it has a kind of global effect but in this PR we
are only touching the Unix timestamp UDFs.
##########
File path: common/src/java/org/apache/hadoop/hive/conf/HiveConf.java
##########
@@ -3711,6 +3711,11 @@ private static void
populateLlapDaemonVarsSet(Set<String> llapDaemonVarsSetLocal
"1800s", new TimeValidator(TimeUnit.SECONDS),
"Interval to synchronize privileges from external authorizer
periodically in HS2"),
+ HIVE_LEGACY_TIMEPARSER_POLICY("hive.legacy.timeparser.policy", false,
+ "When true, java.text.SimpleDateFormat is used for formatting and
parsing\n"
+ + "dates/timestamps in a locale-sensitive manner, which is the
approach before Hive 3.x.\n"
+ + "When set to false, classes from java.time.* packages are used
for the same purpose.\n"
+ + "The default value is false, RuntimeException is thrown when we
will get different results."),
Review comment:
Do we throw an exception? I don't think so.
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Issue Time Tracking
-------------------
Worklog Id: (was: 664847)
Time Spent: 1h 20m (was: 1h 10m)
> Add config to parse date with older date format
> -----------------------------------------------
>
> Key: HIVE-25576
> URL: https://issues.apache.org/jira/browse/HIVE-25576
> Project: Hive
> Issue Type: Improvement
> Affects Versions: 3.1.0, 3.0.0, 3.1.1, 3.1.2, 4.0.0
> Reporter: Ashish Sharma
> Assignee: Ashish Sharma
> Priority: Major
> Labels: pull-request-available
> Time Spent: 1h 20m
> Remaining Estimate: 0h
>
> *History*
> *Hive 1.2* -
> VM time zone set to Asia/Bangkok
> *Query* - SELECT FROM_UNIXTIME(UNIX_TIMESTAMP('1800-01-01 00:00:00
> UTC','yyyy-MM-dd HH:mm:ss z'));
> *Result* - 1800-01-01 07:00:00
> *Implementation details* -
> SimpleDateFormat formatter = new SimpleDateFormat(pattern);
> Long unixtime = formatter.parse(textval).getTime() / 1000;
> Date date = new Date(unixtime * 1000L);
> https://docs.oracle.com/javase/8/docs/api/java/util/Date.html . In official
> documentation they have mention that "Unfortunately, the API for these
> functions was not amenable to internationalization and The corresponding
> methods in Date are deprecated" . Due to that this is producing wrong result
> *Master branch* -
> set hive.local.time.zone=Asia/Bangkok;
> *Query* - SELECT FROM_UNIXTIME(UNIX_TIMESTAMP('1800-01-01 00:00:00
> UTC','yyyy-MM-dd HH:mm:ss z'));
> *Result* - 1800-01-01 06:42:04
> *Implementation details* -
> DateTimeFormatter dtformatter = new DateTimeFormatterBuilder()
> .parseCaseInsensitive()
> .appendPattern(pattern)
> .toFormatter();
> ZonedDateTime zonedDateTime =
> ZonedDateTime.parse(textval,dtformatter).withZoneSameInstant(ZoneId.of(timezone));
> Long dttime = zonedDateTime.toInstant().getEpochSecond();
> *Problem*-
> Now *SimpleDateFormat* has been replaced with *DateTimeFormatter* which is
> giving the correct result but it is not backword compatible. Which is causing
> issue at time for migration to new version. Because the older data written is
> using Hive 1.x or 2.x is not compatible with *DateTimeFormatter*.
> *Solution*
> Introduce an config "hive.legacy.timeParserPolicy" with following values -
> 1. *True*- use *SimpleDateFormat*
> 2. *False* - use *DateTimeFormatter*
> Note: apache spark also face the same issue
> https://issues.apache.org/jira/browse/SPARK-30668
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