tree cb249d70605a83be450802a1053a5e11d4badcf7
parent a2fb086d07b7dbd9c4a59fe57646bd465841edd5
author cmumford <cmumford@google.com> 1483493989 -0800
committer Chris Mumford <cmumford@chromium.org> 1483550000 -0800

Limit the number of read-only files the POSIX Env will have open.

Background compaction can create an unbounded number of
leveldb::RandomAccessFile instances. On 64-bit systems mmap is used and
file descriptors are only used beyond a certain number of mmap's.
32-bit systems to not use mmap at all. leveldb::RandomAccessFile does not
observe Options.max_open_files so compaction could exhaust the file
descriptor limit.

This change uses getrlimit to determine the maximum number of open
files and limits RandomAccessFile to approximately 20% of that value.

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=143505556