Joe McDonnell has uploaded this change for review. ( http://gerrit.cloudera.org:8080/8750
Change subject: IMPALA-6232: Disable file handle cache by default ...................................................................... IMPALA-6232: Disable file handle cache by default There are scenarios where HDFS file appends or HDFS file overwrites can lead to HDFS disabling short circuit reads. Since this can be a performance regression, this changes the default value for max_cached_file_handles to 0 to disable the file handle cache by default. This also changes the default value for unused_file_handle_timeout_sec to 270. If users enable the file handle cache, this setting will prevent some of the scenarios that disable short circuit reads. Ran existing file handle cache tests to verify that there is no impact. Change-Id: Iea7f943f63b72b42286a9e8b9987308baa79d7b0 --- M be/src/runtime/io/disk-io-mgr.cc 1 file changed, 2 insertions(+), 2 deletions(-) git pull ssh://gerrit.cloudera.org:29418/Impala-ASF refs/changes/50/8750/1 -- To view, visit http://gerrit.cloudera.org:8080/8750 To unsubscribe, visit http://gerrit.cloudera.org:8080/settings Gerrit-Project: Impala-ASF Gerrit-Branch: master Gerrit-MessageType: newchange Gerrit-Change-Id: Iea7f943f63b72b42286a9e8b9987308baa79d7b0 Gerrit-Change-Number: 8750 Gerrit-PatchSet: 1 Gerrit-Owner: Joe McDonnell <[email protected]>
