[FALCON-1474] Handling FileNotFoundException on SLA Monitoring service start

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 0.8

Environment

QA

• Assignee: Ajay Yadav
• Reporter: Pragya Mittal
• Created: 22/Sep/15 08:38
• Updated: 27/Sep/15 07:25
• Resolved: 27/Sep/15 07:24

Description

On starting SLA Monitoring service, falcon looks for the following file for checkpointing :

file://${falcon.home}/data/sla/pendingfeedinstances

As this file is not there, server throws the following error :

2015-09-22 05:59:36,880 ERROR - [main:] ~ Couldn't restore the state of feed sla monitoring service. Resetting it (FeedSLAMonitoringService:340)
java.io.FileNotFoundException: File file:/mnt/falcon/server/data/sla/pendingfeedinstances/feedSLAMonitoringService does not exist
        at org.apache.hadoop.fs.RawLocalFileSystem.deprecatedGetFileStatus(RawLocalFileSystem.java:608)
        at org.apache.hadoop.fs.RawLocalFileSystem.getFileLinkStatusInternal(RawLocalFileSystem.java:821)
        at org.apache.hadoop.fs.RawLocalFileSystem.getFileStatus(RawLocalFileSystem.java:598)
        at org.apache.hadoop.fs.FilterFileSystem.getFileStatus(FilterFileSystem.java:414)
        at org.apache.hadoop.fs.ChecksumFileSystem$ChecksumFSInputChecker.<init>(ChecksumFileSystem.java:140)
        at org.apache.hadoop.fs.ChecksumFileSystem.open(ChecksumFileSystem.java:341)
        at org.apache.hadoop.fs.FileSystem.open(FileSystem.java:766)
        at org.apache.falcon.service.FeedSLAMonitoringService.deserializeInternal(FeedSLAMonitoringService.java:351)
        at org.apache.falcon.service.FeedSLAMonitoringService.deserialize(FeedSLAMonitoringService.java:333)
        at org.apache.falcon.service.FeedSLAMonitoringService.init(FeedSLAMonitoringService.java:190)
        at org.apache.falcon.service.ServiceInitializer.initialize(ServiceInitializer.java:47)
        at org.apache.falcon.listener.ContextStartupListener.contextInitialized(ContextStartupListener.java:56)
        at org.mortbay.jetty.handler.ContextHandler.startContext(ContextHandler.java:550)
        at org.mortbay.jetty.servlet.Context.startContext(Context.java:136)
        at org.mortbay.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1282)
        at org.mortbay.jetty.handler.ContextHandler.doStart(ContextHandler.java:519)
        at org.mortbay.jetty.webapp.WebAppContext.doStart(WebAppContext.java:499)
        at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
        at org.mortbay.jetty.handler.HandlerWrapper.doStart(HandlerWrapper.java:130)
        at org.mortbay.jetty.Server.doStart(Server.java:224)
        at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
        at org.apache.falcon.util.EmbeddedServer.start(EmbeddedServer.java:57)
        at org.apache.falcon.Main.main(Main.java:102)
2015-09-22 05:59:36,882 INFO  - [main:] ~ Service initialized: org.apache.falcon.service.FeedSLAMonitoringService (ServiceInitializer:52)

Although this is just a warning signal and sevice works fine but this should be handled so that user doesn't confuse the error with any failure issue.