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Posted to dev@phoenix.apache.org by "James Taylor (JIRA)" <ji...@apache.org> on 2015/09/24 06:13:04 UTC
[jira] [Commented] (PHOENIX-2289) PhoenixContextExecutor spends a
lot of time in getClassLoader
[ https://issues.apache.org/jira/browse/PHOENIX-2289?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14905787#comment-14905787 ]
James Taylor commented on PHOENIX-2289:
---------------------------------------
[~gabriel.reid] - think you might have a few cycles to put together a quick patch?
> PhoenixContextExecutor spends a lot of time in getClassLoader
> -------------------------------------------------------------
>
> Key: PHOENIX-2289
> URL: https://issues.apache.org/jira/browse/PHOENIX-2289
> Project: Phoenix
> Issue Type: Bug
> Affects Versions: 4.3.0
> Reporter: Todd Lipcon
>
> Doing some "poor man's profiling" of a CSV bulk import job, I noticed a lot of time spent in this stack:
> {code}
> "main" prio=10 tid=0x00007f3410018000 nid=0x6f3f runnable [0x00007f3414b4e000]
> java.lang.Thread.State: RUNNABLE
> at java.lang.Class.getClassLoader0(Native Method)
> at java.lang.Class.getClassLoader(Class.java:609)
> at org.apache.phoenix.util.PhoenixContextExecutor$CurrentContextWrapper.before(PhoenixContextExecutor.java:45)
> at org.apache.phoenix.call.CallRunner.run(CallRunner.java:51)
> at org.apache.phoenix.jdbc.PhoenixStatement.executeMutation(PhoenixStatement.java:270)
> at org.apache.phoenix.jdbc.PhoenixStatement.execute(PhoenixStatement.java:211)
> at org.apache.phoenix.jdbc.PhoenixPreparedStatement.execute(PhoenixPreparedStatement.java:174)
> at org.apache.phoenix.jdbc.PhoenixPreparedStatement.execute(PhoenixPreparedStatement.java:179)
> at org.apache.phoenix.util.csv.CsvUpsertExecutor.execute(CsvUpsertExecutor.java:155)
> at org.apache.phoenix.util.csv.CsvUpsertExecutor.execute(CsvUpsertExecutor.java:136)
> at org.apache.phoenix.mapreduce.CsvToKeyValueMapper.map(CsvToKeyValueMapper.java:163)
> at org.apache.phoenix.mapreduce.CsvToKeyValueMapper.map(CsvToKeyValueMapper.java:69)
> {code}
> Class.getClassLoader is relatively expensive (see http://bugs.java.com/view_bug.do?bug_id=6642881 ) so it may make sense to cache this classloader as a static final member of the class.
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