Adar Dembo has submitted this change and it was merged.

Change subject: block manager: require file cache
......................................................................


block manager: require file cache

The file cache has been in Kudu since 1.2 and we've yet to see any major
issues. So let's make it required; doing so lets us clean up some branches.

As for block_manager_max_open_files, I changed the meaning of the value 0
from "no limit" to "error"; this seemed net less disruptive than changing
the meaning of -1 from "40%" to "error" and 0 from "no limit" to "40%".

Change-Id: I9946e537e0b4abd66a9a90fc05df04232db68bc0
Reviewed-on: http://gerrit.cloudera.org:8080/6880
Reviewed-by: Todd Lipcon <[email protected]>
Tested-by: Kudu Jenkins
---
M src/kudu/fs/block_manager.cc
M src/kudu/fs/file_block_manager.cc
M src/kudu/fs/file_block_manager.h
M src/kudu/fs/log_block_manager.cc
M src/kudu/fs/log_block_manager.h
5 files changed, 54 insertions(+), 100 deletions(-)

Approvals:
  Todd Lipcon: Looks good to me, approved
  Kudu Jenkins: Verified



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Gerrit-MessageType: merged
Gerrit-Change-Id: I9946e537e0b4abd66a9a90fc05df04232db68bc0
Gerrit-PatchSet: 3
Gerrit-Project: kudu
Gerrit-Branch: master
Gerrit-Owner: Adar Dembo <[email protected]>
Gerrit-Reviewer: Adar Dembo <[email protected]>
Gerrit-Reviewer: Kudu Jenkins
Gerrit-Reviewer: Todd Lipcon <[email protected]>

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