Impala Public Jenkins has submitted this change and it was merged. ( 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 Reviewed-on: http://gerrit.cloudera.org:8080/8750 Reviewed-by: Joe McDonnell <[email protected]> Tested-by: Impala Public Jenkins --- M be/src/runtime/io/disk-io-mgr.cc 1 file changed, 8 insertions(+), 2 deletions(-) Approvals: Joe McDonnell: Looks good to me, approved Impala Public Jenkins: Verified -- 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: merged Gerrit-Change-Id: Iea7f943f63b72b42286a9e8b9987308baa79d7b0 Gerrit-Change-Number: 8750 Gerrit-PatchSet: 5 Gerrit-Owner: Joe McDonnell <[email protected]> Gerrit-Reviewer: Impala Public Jenkins Gerrit-Reviewer: Joe McDonnell <[email protected]> Gerrit-Reviewer: Lars Volker <[email protected]> Gerrit-Reviewer: Thomas Tauber-Marshall <[email protected]> Gerrit-Reviewer: Tim Armstrong <[email protected]>
