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https://issues.apache.org/jira/browse/PARQUET-2240?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17690260#comment-17690260
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Gang Wu commented on PARQUET-2240:
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Thanks for reporting the issue. Could you please open a PR? [~shani.elha]
> DateTimeFormatter is used in static context, but not thread safe
> ----------------------------------------------------------------
>
> Key: PARQUET-2240
> URL: https://issues.apache.org/jira/browse/PARQUET-2240
> Project: Parquet
> Issue Type: Bug
> Components: parquet-mr
> Environment: Linux, OpenJDK 17 (based on docker image openjdk:17-slim)
>
> Reporter: Shani Elharrar
> Priority: Trivial
> Labels: bug
> Original Estimate: 24h
> Remaining Estimate: 24h
>
> DateTimeFormatter is used in static context but not thread safe, a formatter
> instance is created in PrimitiveStringifer.DateStringifier, and
> DateStringifier is created in static final DATE_STRINGIFIER,
> TIMESTAMP_MILLIS_STRINGIFIER, TIMESTAMP_MICROS_STRINGIFIER,
> TIMESTAMP_NANOS_STRINGIFIER, TIMESTAMP_MILLIS_UTC_STRINGIFIER,
> TIMESTAMP_MICROS_UTC_STRINGIFIER, and TIMESTAMP_NANOS_UTC_STRINGIFIER.
> This causes exceptions like the following to be thrown from parquet-code:
> java.lang.ArrayIndexOutOfBoundsException: Index 633 out of bounds for length
> 13
> stacktrace:
> at
> java.base/sun.util.calendar.BaseCalendar.getCalendarDateFromFixedDate(BaseCalendar.java:457)
> at
> java.base/java.util.GregorianCalendar.computeFields(GregorianCalendar.java:2358)
> at
> java.base/java.util.GregorianCalendar.computeFields(GregorianCalendar.java:2273)
> at java.base/java.util.Calendar.setTimeInMillis(Calendar.java:1827)
> at java.base/java.util.Calendar.setTime(Calendar.java:1793)
> at java.base/java.text.SimpleDateFormat.format(SimpleDateFormat.java:978)
> at java.base/java.text.SimpleDateFormat.format(SimpleDateFormat.java:971)
> at java.base/java.text.DateFormat.format(DateFormat.java:339)
> at java.base/java.text.Format.format(Format.java:159)
> at
> org.apache.parquet.schema.PrimitiveStringifier$DateStringifier.toFormattedString(PrimitiveStringifier.java:265)
> at
> org.apache.parquet.schema.PrimitiveStringifier$DateStringifier.stringify(PrimitiveStringifier.java:256)
> at
> org.apache.parquet.column.statistics.IntStatistics.stringify(IntStatistics.java:92)
> at
> org.apache.parquet.column.statistics.IntStatistics.stringify(IntStatistics.java:25)
> at
> org.apache.parquet.column.statistics.Statistics.minAsString(Statistics.java:423)
> (... unrelated code)
> A simple solution would be to change those from static to non static values.
> I can create a PR if the solution is ok by the maintainers of the library.
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