Vikas Vishwakarma updated HBASE-18517:
    Attachment: HBASE-18517.master.001.patch

> limit max log message width in log4j
> ------------------------------------
>                 Key: HBASE-18517
>                 URL: https://issues.apache.org/jira/browse/HBASE-18517
>             Project: HBase
>          Issue Type: Bug
>    Affects Versions: 3.0.0, 1.5.0
>            Reporter: Vikas Vishwakarma
>            Assignee: Vikas Vishwakarma
>             Fix For: 3.0.0, 1.5.0
>         Attachments: HBASE-18517.branch-1.001.patch, 
> HBASE-18517.master.001.patch
> 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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