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Hive >> mail # dev >> Re: Review Request 11029: HIVE-4513 - disable hivehistory logs by default

Thejas Nair 2013-08-10, 16:26
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Re: Review Request 11029: HIVE-4513 - disable hivehistory logs by default

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(Updated Aug. 10, 2013, 4:24 p.m.)
Review request for hive.

HIVE-4513.6.patch - addresses review comments. Fixes race condition that was causing the TestHiveServerSessions.testSessionVars test failure.
Bugs: HIVE-4513
Repository: hive-git

HiveHistory log files (hive_job_log_hive_*.txt files) store information about hive query such as query string, plan , counters and MR job progress information.

There is no mechanism to delete these files and as a result they get accumulated over time, using up lot of disk space.
I don't think this is used by most people, so I think it would better to turn this off by default. Jobtracker logs already capture most of this information, though it is not as structured as history logs.

The change :
A new config parameter hive.session.history.enabled controls if the history-log is enabled. By default it is set to false.
SessionState initializes the HiveHIstory object. When this config is set to false, it creates a Proxy object that does not do anything. I did this instead of having SessionState return null, because that would add null checks in too many places. This keeps the code cleaner and avoids possibility of NPE.
As the proxy only works against interfaces, i created a HiveHistory interface, moved the implementation to HiveHistoryImpl. static functions were moved to HiveHistoryUtil .
Diffs (updated)

  common/src/java/org/apache/hadoop/hive/conf/HiveConf.java 83f337b
  conf/hive-default.xml.template 0a6e433
  hbase-handler/src/test/templates/TestHBaseCliDriver.vm c59e882
  ql/src/java/org/apache/hadoop/hive/ql/history/HiveHistory.java 97436c5
  ql/src/java/org/apache/hadoop/hive/ql/history/HiveHistoryImpl.java PRE-CREATION
  ql/src/java/org/apache/hadoop/hive/ql/history/HiveHistoryProxyHandler.java PRE-CREATION
  ql/src/java/org/apache/hadoop/hive/ql/history/HiveHistoryUtil.java PRE-CREATION
  ql/src/java/org/apache/hadoop/hive/ql/history/HiveHistoryViewer.java fdd56db
  ql/src/java/org/apache/hadoop/hive/ql/session/SessionState.java ab369f0
  ql/src/test/org/apache/hadoop/hive/ql/history/TestHiveHistory.java a783303
  ql/src/test/templates/TestCliDriver.vm a6ae6c3

Diff: https://reviews.apache.org/r/11029/diff/

Thejas Nair