[FALCON-2023] Feed eviction fails when feed locations "stats" and "meta" does not have time pattern.

• Type: Bug
• Status: Resolved
• Priority: Blocker
• Resolution: Fixed
• Affects Version/s: 0.9
• Fix Version/s: trunk, 0.10
• Component/s: feed
• Assignee: Venkatesan Ramachandran
• Reporter: Balu Vellanki
• Created: 10/Jun/16 16:41
• Updated: 13/Jun/16 22:20
• Resolved: 13/Jun/16 22:20

Description

Submit a feed

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<feed name="rawEmailFeed" description="Raw customer email feed" xmlns="uri:falcon:feed:0.1">
    <tags>externalSystem=USWestEmailServers</tags>
    <groups>churnAnalysisDataPipeline</groups>
    <frequency>hours(1)</frequency>
    <timezone>UTC</timezone>
    <late-arrival cut-off="hours(1)"/>
    <clusters>
        <cluster name="primaryCluster" type="source">
            <validity start="2015-10-30T01:00Z" end="2015-10-30T10:00Z"/>
            <retention limit="days(90)" action="delete"/>
        </cluster>
    </clusters>
    <locations>
        <location type="data" path="/user/ambari-qa/falcon/demo/primary/input/enron/${YEAR}-${MONTH}-${DAY}-${HOUR}"/>
        <location type="stats" path="/tmp"/>
        <location type="meta" path="/tmp"/>
    </locations>
    <ACL owner="ambari-qa" group="users" permission="0x755"/>
    <schema location="/none" provider="/none"/>
</feed>

Notice how "stats" and "meta" does not have time pattern. Both stats and meta location are optional, and if they dont have timed pattern - it should not lead to failure in feed eviction. But feed eviction fails with following error.

Caused by: org.apache.falcon.FalconException: Couldn't evict feed from fileSystem
	at org.apache.falcon.entity.FileSystemStorage.evict(FileSystemStorage.java:306)
	at org.apache.falcon.retention.FeedEvictor.run(FeedEvictor.java:76)
	at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:76)
	at org.apache.falcon.retention.FeedEvictor.main(FeedEvictor.java:52)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:497)
	at org.apache.oozie.action.hadoop.JavaMain.run(JavaMain.java:56)
	... 15 more
Caused by: java.io.IOException: Unable to resolve pattern for feedPath: /tmp
	at org.apache.falcon.entity.FeedHelper.getFeedBasePath(FeedHelper.java:442)
	at org.apache.falcon.entity.FileSystemStorage.fileSystemEvictor(FileSystemStorage.java:331)
	at org.apache.falcon.entity.FileSystemStorage.evict(FileSystemStorage.java:300)
	... 23 more

Issue Links

• links to: GitHub Pull Request #182