Joe McDonnell has uploaded this change for review. ( http://gerrit.cloudera.org:8080/20919
Change subject: IMPALA-12669: Ignore loop devices for DiskIoMgr ...................................................................... IMPALA-12669: Ignore loop devices for DiskIoMgr Loop devices are read-only devices mounting a file's contents. Ubuntu uses loop devices extensively for snap packages (e.g. on one development system, there are 18 loop devices). Right now, Impala is allocating DiskIoMgr threads for these loop devices. Since it believes they are not rotational devices, each loop device gets 8 threads, and this is doubled due to HDFS monitoring threads. These extra threads slow down processing minidumps and debugging with gdb. >From Impala's point of view, loop devices are unlikely to be interesting. This detects loop devices and avoids allocating DiskIoMgr threads for them. Testing: - Hand tested on my development machine, which has many snap packages. Change-Id: Ic09230e465f78d55876909453e8a7e39d9a89c4c --- M be/src/util/disk-info.cc 1 file changed, 12 insertions(+), 0 deletions(-) git pull ssh://gerrit.cloudera.org:29418/Impala-ASF refs/changes/19/20919/1 -- To view, visit http://gerrit.cloudera.org:8080/20919 To unsubscribe, visit http://gerrit.cloudera.org:8080/settings Gerrit-Project: Impala-ASF Gerrit-Branch: master Gerrit-MessageType: newchange Gerrit-Change-Id: Ic09230e465f78d55876909453e8a7e39d9a89c4c Gerrit-Change-Number: 20919 Gerrit-PatchSet: 1 Gerrit-Owner: Joe McDonnell <[email protected]>
