Andras Salamon created OOZIE-3387:
-------------------------------------
Summary: Optimize coordinator data input dependency search
Key: OOZIE-3387
URL: https://issues.apache.org/jira/browse/OOZIE-3387
Project: Oozie
Issue Type: Improvement
Reporter: Andras Salamon
During data input dependency check Oozie evaluates EL functions like {{
coord:latest}} using a non-optimal way which may result more than necessary
HDFS URI checks.
1. If the {{dataset}} frequency does not match the {{uri-template}} it checks
the same HDFS URI multiple times. For instance in the following definition:
{noformat}
<dataset name="dataset1" frequency="${coord:minutes(1)}"
initial-instance="2017-01-01T08:15Z" timezone="UTC">
<uri-template>${nameNode}/${rootDir}/${YEAR}-${MONTH}-${DAY}</uri-template>
<done-flag>_SUCCESS</done-flag>
</dataset>
...
<data-in name="coordInput" dataset="dataset1">
<instance>${coord:latest(0)}</instance>
</data-in>
{noformat}
oozie check the same {{.../2018-11-20/_SUCCESS}} file 24*60=1440 times. It
would be enough to check the file only once and skip the other 1439 tests.
2. If the frequency is 1 day and {{uri-template}} is definied in the following
way:
{noformat}
<uri-template>${nameNode}/${rootDir}/${YEAR}/${MONTH}/${DAY}</uri-template>
{noformat}
oozie will check the following directories one by one even if the some of the
parent directories are missing:
{noformat}
2018/11/20
2018/11/19
2018/11/18
...
{noformat}
If there is no {{2018/11}} directory then it is not necessary to check all the
{{2018/11/xx}} directories. It would be possible to reduce the number of HDFS
URI checks.
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