Alex Behm has posted comments on this change. Change subject: IMPALA-4172: Switch to BlockLocation methods for disk IDs ......................................................................
Patch Set 1: (1 comment) http://gerrit.cloudera.org:8080/#/c/4914/1/fe/src/main/java/org/apache/impala/catalog/HdfsTable.java File fe/src/main/java/org/apache/impala/catalog/HdfsTable.java: Line 379: private static int getDiskId(String storageId) { > could you go into detail about the performance problems? In the BE we mod the disk id to determine which disk queue to put reads on, so I'm worried about pathological cases with "collisions" where many ranges are assigned to only one disk thread. That will be quite hard to debug. -- To view, visit http://gerrit.cloudera.org:8080/4914 To unsubscribe, visit http://gerrit.cloudera.org:8080/settings Gerrit-MessageType: comment Gerrit-Change-Id: Ibbff94cef9a9db7b3945f8e7b0286866d2cc3b61 Gerrit-PatchSet: 1 Gerrit-Project: Impala-ASF Gerrit-Branch: master Gerrit-Owner: Laszlo Gaal <laszlo.g...@cloudera.com> Gerrit-Reviewer: Alex Behm <alex.b...@cloudera.com> Gerrit-Reviewer: Laszlo Gaal <laszlo.g...@cloudera.com> Gerrit-Reviewer: Marcel Kornacker <mar...@cloudera.com> Gerrit-Reviewer: Tim Armstrong <tarmstr...@cloudera.com> Gerrit-HasComments: Yes
