Details
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Wish
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Status: Resolved
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Critical
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Resolution: Not A Problem
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None
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None
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meatspace
Description
Details are incredibly important when making a bug report.
- Provide a reproducible test case:
- unit test, or integration test preferred
- step-by-step instructions
- Provide evidence:
- logs
- transcripts of following step-by-step instructions
- What version of accumulo are you using?
- tagged version: provide the tag, ie. 1.4.2
- branch: provide the hash from the last pull
- What versions of dependencies are you using:
- zookeeper
- hadoop
- jvm
- operation system
- How many cores, how much memory, how many disks?
- Is this a virtual machine? Is it running on a commercial cloud?
- What have you changed in the configuration?
- Have you reverted local code changes and re-tested?
- Post every detail you can think of:
- config files
- test runs
- cluster size
- hdfs disk usage at the time
- load average
- phase of the moon (kidding!)
- except if something happens periodically ... include the period of time
- with specific measurements: "see attached graph"
- jstack stuck processes
- provide relevant OS settings
- "I have set swappiness to zero as suggested in the README"
- "No swapping was observed, here's the output of free..."
- "The file descriptor limit was set to 1024, but this is a single node instance."
Things to avoid:
- lack of specific messages from logs, output, etc.
- "I think it said something about tablet not from mars... something like that"
- "it doesn't build... maybe missing some jar file"
- frustration: "I updated to version 1.1 AND NOW NOTHING WORKS!?"
- generalizations without details:
- in 1.2, I could create tables faster than 1.3
- servers seem to fail more often than before
- before what?
- what else changed?
- how can I reproduce your problem?
Cooperate
Please provide the details if asked:
- "Can you jstack the server next time and post it?"
- Can you send your zookeepers the "stat" command and send the output?
- When this happens, are you running a map-reduce job?
- If you send me all your tablet server logs, I can probably figure out what happened
- Are you seeing any errors on the monitor?
- What version of accumulo are you running?
Attachments
Issue Links
- relates to
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ACCUMULO-1823 Test failures after switching to Hadoop2
- Resolved