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From "Vikas Vishwakarma (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (HBASE-18517) limit max log message width in log4j
Date Fri, 04 Aug 2017 03:49:00 GMT

    [ https://issues.apache.org/jira/browse/HBASE-18517?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16113883#comment-16113883
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Vikas Vishwakarma edited comment on HBASE-18517 at 8/4/17 3:48 AM:
-------------------------------------------------------------------

Do let me know if the above looks ok and if there are any suggestions on what should be the
max width limit for the log messages. I see normally 200-300 bytes on an average for log lines.
Maybe 100-200 times with some more buffer should be ok so we can possibly consider 5K to 10K
limits


was (Author: vik.karma):
Do let me know if the above looks ok and if there are any suggestions on what should be the
max width limit for the log messages. I see normally 200-300 bytes on an average for log lines.
Maybe 10-20 times should be ok so we can possibly consider 5K to 10K limits

> limit max log message width in log4j
> ------------------------------------
>
>                 Key: HBASE-18517
>                 URL: https://issues.apache.org/jira/browse/HBASE-18517
>             Project: HBase
>          Issue Type: Bug
>            Reporter: Vikas Vishwakarma
>            Assignee: Vikas Vishwakarma
>
> We had two cases now in our prod / pilot setups which is leading to humongous log lines
in RegionServer logs. 
> In first case, one of the phoenix user had constructed a query with a really large list
of Id filters (61 MB) that translated into HBase scan that was running slow which lead to
responseTooSlow messages in the logs with the entire filter list being printed in the logs,
example
> ipc.RpcServer - (responseTooSlow): {"call":"Scan(org.apache.hadoop.hbase.protobuf.generated.ClientProtos$ScanRequest)","starttimems":1501457864417,"responsesize":11,"method":"Scan","param":"region
{ type: REGION_NAME value:  ..... org.apache.hadoop.hbase.filter.FirstKeyOnlyFilter\\022\351\\200\\036\\n(org.apache.phoenix.filter.SkipScanFilter
... <a really long filter list leading to single log lines of size 61MB> ... 
> There was another case where a use case had created a table with really large key/region
names. This was causing humongous log lines for flush and compaction on these regions filling
up the RS logs
> These large logs usually cause issues with disk I/O load, loading the splunk servers,
even machine perf degradations. With 61 MB log lines basic log processing commands like vim,
scrolling the logs, wc -l , etc were getting stuck. High GC activity was also noted on this
cluster although not 100% sure if it was related to above issue. 
> We should consider limiting the message size in logs which can be easily done by adding
a maximum width format modifier on the message conversion character in log4j.properties
> log4j.appender.console.layout.ConversionPattern=...: %m%n
> to 
> log4j.appender.console.layout.ConversionPattern=...: %.10000m%n



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