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From "Enrico Olivelli (Jira)" <j...@apache.org>
Subject [jira] [Updated] (ZOOKEEPER-1983) Append to zookeeper.out (not overwrite) to support logrotation
Date Fri, 06 Sep 2019 15:46:11 GMT

     [ https://issues.apache.org/jira/browse/ZOOKEEPER-1983?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Enrico Olivelli updated ZOOKEEPER-1983:
    Fix Version/s:     (was: 3.5.6)

> Append to zookeeper.out (not overwrite) to support logrotation
> --------------------------------------------------------------
>                 Key: ZOOKEEPER-1983
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-1983
>             Project: ZooKeeper
>          Issue Type: Bug
>          Components: server
>    Affects Versions: 3.3.5, 3.3.6, 3.4.6
>         Environment: CentOS 5.x (and probably any Linux distribution for that matter)
>            Reporter: Shyamal Prasad
>            Assignee: Shyamal Prasad
>            Priority: Major
>             Fix For: 3.6.0, 3.5.7
>         Attachments: ZK1983.patch, ZOOKEEPER-1983.patch
> Currently zkServer.sh will redirect output to zookeeper.out using a simple shell redirect.

> When logrotate (and similar tools) are used to rotate the zookeeper.out file with the
'copytruncate' semantics (copy the file, truncate it to zero bytes) the next write results
in a sparse file with the write at the offset of the last file. Effectively the log file is
now full a null bytes and it is hard to read/use the file (and the rotated copies). 
> Even worse, the result is zookeeper.out file only gets "larger" (though sparse) and after
a while on a chatty system it takes significant CPU resources to compress the file (which
is all nulls!)
> The simple fix is to append to the file (>>) instead of a simple redirection (>)
> This issue was found in a 3.3.5 production system, however code in trunk has the same

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