Andrew Wong has uploaded a new change for review. http://gerrit.cloudera.org:8080/6636
Change subject: KUDU-1952 Improve block placement ...................................................................... KUDU-1952 Improve block placement This is the first of a multi-patch patchset to mitigate the single-disk failure. Throughout the code, the term "DataDir" refers to a data directory, which is often mounted on a distinct disk. Thus, "disks" and "data directories" will be used interchangeably. This patch adds a mapping from tablet to a set of disks and uses it to replace the existing round-robin placement of blocks. Tablets are mapped to a fixed number of disks (i.e. a DataDirGroup). New blocks are placed randomly in directories within each tablet's DataDirGroup. Tablet-to-group mappings are generated and stored as metadata upon tablet creation, or upon tablet replacement during a tablet copy. During group creation, disks are added to groups by randomly selecting two available directories and selecting the one with fewer tablets on it. This avoids pigeonholing new tablets to disks with relatively few tablets, while still trending towards filling underloaded disks. Groups are maintained when restarting the server, as they are flushed with metadata, and are deleted upon tablet deletion. Change-Id: I9828147f4fa5c4d7f6ed23441dca5a116b8cb11b --- M src/kudu/fs/block_manager-stress-test.cc M src/kudu/fs/block_manager-test.cc M src/kudu/fs/block_manager.h M src/kudu/fs/data_dirs.cc M src/kudu/fs/data_dirs.h M src/kudu/fs/file_block_manager.cc M src/kudu/fs/file_block_manager.h M src/kudu/fs/fs_manager.cc M src/kudu/fs/fs_manager.h M src/kudu/fs/log_block_manager-test.cc M src/kudu/fs/log_block_manager.cc M src/kudu/fs/log_block_manager.h M src/kudu/tablet/delta_compaction.cc M src/kudu/tablet/delta_compaction.h M src/kudu/tablet/delta_tracker.cc M src/kudu/tablet/diskrowset.cc M src/kudu/tablet/metadata.proto M src/kudu/tablet/multi_column_writer.cc M src/kudu/tablet/multi_column_writer.h M src/kudu/tablet/tablet_bootstrap-test.cc M src/kudu/tablet/tablet_metadata.cc M src/kudu/tablet/tablet_metadata.h M src/kudu/tserver/tablet_copy_client-test.cc M src/kudu/tserver/tablet_copy_client.cc M src/kudu/tserver/tablet_copy_client.h M src/kudu/tserver/ts_tablet_manager.cc M src/kudu/tserver/ts_tablet_manager.h 27 files changed, 617 insertions(+), 158 deletions(-) git pull ssh://gerrit.cloudera.org:29418/kudu refs/changes/36/6636/1 -- To view, visit http://gerrit.cloudera.org:8080/6636 To unsubscribe, visit http://gerrit.cloudera.org:8080/settings Gerrit-MessageType: newchange Gerrit-Change-Id: I9828147f4fa5c4d7f6ed23441dca5a116b8cb11b Gerrit-PatchSet: 1 Gerrit-Project: kudu Gerrit-Branch: master Gerrit-Owner: Andrew Wong <aw...@cloudera.com>
