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Clarify documentation of File adapter semantics

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Holger Just 2018-01-26 18:00:37 +01:00
parent 18abd892ba
commit 4a012e28cc
1 changed files with 16 additions and 11 deletions
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27
lib/rackstash/adapter/file.rb
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@ -13,18 +13,23 @@ require 'rackstash/adapter/base_adapter'
module Rackstash
module Adapter
# This log adapter allows to write logs to a file acessible on the local
# filesystem. We assume filesystem semantics of the usual local filesystems
# used on Linux, macOS, BSDs, or Windows. Here, we can ensure that even
# concurrent writes of multiple processes (e.g. multiple worker processes of
# an application server) don't produce interleaved log lines.
# This log adapter allows to write logs to a file accessible on the local
# filesystem. Written log lines are delimited by a newline character (`\n`).
# A suitable encoders should ensure that single logs do not contain any
# verbatim newline characters themselves. All Rackstash encoders producing
# JSON formatted logs are suitable in this regard.
#
# When using a remote filesystem (e.g. NFS or most FUSE filesystems but not
# for SMB) it might be possible that concurrent log writes to the same file
# are interleaved on disk, resulting on probable log corruption. If this is
# a concern, you should make sure that only one log adapter of one process
# write to a log file at a time or (preferrably) write to a local file
# instead.
# When writing the logs, we assume filesystem semantics of the usual local
# filesystems used on Linux, macOS, BSDs, or Windows. Here, we can ensure
# that even concurrent writes of multiple processes (e.g. multiple worker
# processes of an application server) don't produce interleaved log lines.
#
# When using a remote filesystem it might be possible that concurrent log
# writes to the same file are interleaved on disk, resulting on probable
# log corruption. If this is a concern, you should make sure that only one
# log adapter of one process write to a log file at a time or (preferrably)
# write to a local file instead. This restriction applies to NFS and most
# FUSE filesystems like sshfs. SMB is likely safe to use here.
#
# When reading the log file, the reader might still see incomplete writes
# depending on the OS and filesystem. Since we are only writing complete