[kudu-CR] WIP KUDU-3197 [tserver] optimal Schema's memory used, using std::shared ptr

["Yuqi Du (Code Review)" <ge...@cloudera.org>]

Hello Kudu Jenkins, 

I'd like you to reexamine a change. Please visit

    http://gerrit.cloudera.org:8080/18198

to look at the new patch set (#2).

Change subject: WIP KUDU-3197 [tserver] optimal Schema's memory used, using std::shared_ptr
......................................................................

WIP KUDU-3197 [tserver] optimal Schema's memory used, using std::shared_ptr

Change TabletMeta's variable Schema* to std::shared_ptr<Schema>
to reduce memory used when alter schema.

Because TabletMeta has a old_schemas to reserve the elder schema
when alter schema, maybe they has been used by scanners or
compactions job. But as jira KUDU-3197 said, alter schemas will lead to tserver's
memory too large, just like memory leak, especially column's number is very
large.

wangningito has proposed a simple solution at https://gerrit.cloudera.org/c/16508/.
And I continue his work, and the detail at: https://gerrit.cloudera.org/c/18098/,
But the changes has been thought too much, and code reviewers advise changing from
scoped_refptr<Schema> to std::shared_ptr.

Change-Id: I586e3a67791de4006c3479b39f3222cbf93fac28
---
M src/kudu/client/client-test.cc
M src/kudu/common/generic_iterators-test.cc
M src/kudu/common/generic_iterators.cc
M src/kudu/common/partial_row-test.cc
M src/kudu/common/schema.h
M src/kudu/consensus/consensus_peers-test.cc
M src/kudu/consensus/consensus_queue-test.cc
M src/kudu/consensus/log-test-base.h
M src/kudu/consensus/log.cc
M src/kudu/consensus/log.h
M src/kudu/consensus/log_cache-test.cc
M src/kudu/consensus/raft_consensus_quorum-test.cc
M src/kudu/integration-tests/alter_table-test.cc
M src/kudu/integration-tests/linked_list-test-util.h
M src/kudu/integration-tests/registration-test.cc
M src/kudu/integration-tests/table_locations-itest.cc
M src/kudu/integration-tests/ts_recovery-itest.cc
M src/kudu/master/catalog_manager.cc
M src/kudu/master/catalog_manager.h
M src/kudu/master/master.h
M src/kudu/master/sys_catalog.cc
M src/kudu/tablet/all_types-scan-correctness-test.cc
M src/kudu/tablet/cfile_set-test.cc
M src/kudu/tablet/cfile_set.cc
M src/kudu/tablet/cfile_set.h
M src/kudu/tablet/compaction-test.cc
M src/kudu/tablet/compaction.cc
M src/kudu/tablet/compaction.h
M src/kudu/tablet/composite-pushdown-test.cc
M src/kudu/tablet/delta_compaction-test.cc
M src/kudu/tablet/delta_compaction.cc
M src/kudu/tablet/delta_compaction.h
M src/kudu/tablet/delta_store.cc
M src/kudu/tablet/delta_store.h
M src/kudu/tablet/delta_tracker.cc
M src/kudu/tablet/delta_tracker.h
M src/kudu/tablet/deltafile-test.cc
M src/kudu/tablet/deltafile.cc
M src/kudu/tablet/deltamemstore-test.cc
M src/kudu/tablet/diff_scan-test.cc
M src/kudu/tablet/diskrowset-test-base.h
M src/kudu/tablet/diskrowset-test.cc
M src/kudu/tablet/diskrowset.cc
M src/kudu/tablet/diskrowset.h
M src/kudu/tablet/major_delta_compaction-test.cc
M src/kudu/tablet/memrowset-test.cc
M src/kudu/tablet/memrowset.cc
M src/kudu/tablet/memrowset.h
M src/kudu/tablet/mock-rowsets.h
M src/kudu/tablet/mt-rowset_delta_compaction-test.cc
M src/kudu/tablet/mt-tablet-test.cc
M src/kudu/tablet/ops/alter_schema_op.cc
M src/kudu/tablet/ops/alter_schema_op.h
M src/kudu/tablet/ops/op.h
M src/kudu/tablet/ops/write_op.h
M src/kudu/tablet/rowset.cc
M src/kudu/tablet/rowset.h
M src/kudu/tablet/rowset_metadata.h
M src/kudu/tablet/tablet-decoder-eval-test.cc
M src/kudu/tablet/tablet-harness.h
M src/kudu/tablet/tablet-pushdown-test.cc
M src/kudu/tablet/tablet-schema-test.cc
M src/kudu/tablet/tablet-test-base.h
M src/kudu/tablet/tablet-test-util.h
M src/kudu/tablet/tablet-test.cc
M src/kudu/tablet/tablet.cc
M src/kudu/tablet/tablet.h
M src/kudu/tablet/tablet_bootstrap-test.cc
M src/kudu/tablet/tablet_bootstrap.cc
M src/kudu/tablet/tablet_metadata.cc
M src/kudu/tablet/tablet_metadata.h
M src/kudu/tablet/tablet_random_access-test.cc
M src/kudu/tablet/tablet_replica-test-base.cc
M src/kudu/tablet/tablet_replica-test.cc
M src/kudu/tablet/txn_participant-test.cc
M src/kudu/tools/ksck.h
M src/kudu/tools/ksck_checksum.cc
M src/kudu/tools/ksck_checksum.h
M src/kudu/tools/kudu-tool-test.cc
M src/kudu/tools/tool_action_common.cc
M src/kudu/tools/tool_action_fs.cc
M src/kudu/tools/tool_action_local_replica.cc
M src/kudu/tools/tool_action_perf.cc
M src/kudu/tools/tool_action_remote_replica.cc
M src/kudu/transactions/txn_status_tablet.cc
M src/kudu/tserver/mini_tablet_server.cc
M src/kudu/tserver/scanners.cc
M src/kudu/tserver/scanners.h
M src/kudu/tserver/tablet_copy_client.cc
M src/kudu/tserver/tablet_copy_source_session-test.cc
M src/kudu/tserver/tablet_server-test-base.cc
M src/kudu/tserver/tablet_server-test.cc
M src/kudu/tserver/tablet_service.cc
M src/kudu/tserver/ts_tablet_manager-test.cc
M src/kudu/tserver/ts_tablet_manager.cc
M src/kudu/tserver/ts_tablet_manager.h
M src/kudu/tserver/tserver_path_handlers.cc
97 files changed, 667 insertions(+), 570 deletions(-)


  git pull ssh://gerrit.cloudera.org:29418/kudu refs/changes/98/18198/2
-- 
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Gerrit-Project: kudu
Gerrit-Branch: master
Gerrit-MessageType: newpatchset
Gerrit-Change-Id: I586e3a67791de4006c3479b39f3222cbf93fac28
Gerrit-Change-Number: 18198
Gerrit-PatchSet: 2
Gerrit-Owner: Yuqi Du <sh...@gmail.com>
Gerrit-Reviewer: Kudu Jenkins (120)