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https://issues.apache.org/jira/browse/OOZIE-1561?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14059342#comment-14059342
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Purshotam Shah commented on OOZIE-1561:
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If we can partition log based on jobid and store it into DFS as Robert
mentioned, we will have added advantage, Oozie CLI can directly download log
from Hadoop without talking to oozie server.
Initially we can dump all logs from all server to DFS and can have a
periodically hadoop job which will read logs from DFS ( from all server), merge
it and partition it based on jobid.
Though, we need to do some work for coord actionID and log filters.
> When using Oozie HA, the logs should also be HA
> -----------------------------------------------
>
> Key: OOZIE-1561
> URL: https://issues.apache.org/jira/browse/OOZIE-1561
> Project: Oozie
> Issue Type: Improvement
> Components: HA
> Affects Versions: trunk
> Reporter: Robert Kanter
> Assignee: Bowen Zhang
> Priority: Critical
> Attachments: OozielogHAtechnicaldesigndoc.pdf,
> OozielogHAtechnicaldesigndoc.pdf
>
>
> Currently, if an Oozie server goes down, the logs from that server become
> unavailable until the server comes back up. In the meantime, the user may or
> may not be aware that log messages could be missing when Oozie streams logs
> to the user.
> We should come up with a way to make the logs HA.
> Some ideas:
> # When rolling the logs, copy them into HDFS; Oozie servers can then read the
> log files directly from HDFS instead of each other
> #- The downside to this is that there will be a window where logs could still
> be missing as they only show up in HDFS after rolling over (default = 1hr)
> and Oozie servers would still have to contact each other for the last hour of
> logs
> #- The upside is that it minimizes the amount of logs that could be missing
> and would be fairly straightforward to implement
> # Log directly to HDFS
> #- The downside is that this may be complicated or tricky to get working
> properly
> #-- This also introduces a strict dependency on HDFS
> #- The upside is that this would completely solve the issue and Oozie servers
> would simply get all logs directly from HDFS
> # Log to ZooKeeper or a database
> #- I think the log files will be too big to do this
> I've assigned this to myself, but if someone wants to tackle this, feel free
> to reassign it. I think idea 2 is the most practical, but I'm also open to
> other ideas on how to do this.
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