Vihang Karajgaonkar has uploaded this change for review. ( http://gerrit.cloudera.org:8080/14806
Change subject: IMPALA-9122 : Ignore FileNotFoundException when loading a table ...................................................................... IMPALA-9122 : Ignore FileNotFoundException when loading a table It is possible that when the file metadata of a table or partition is being loaded, some temporary files (like the ones in .hive-staging directory) are deleted by external engines like Hive. This causes a FileNotFoundException during the load and it fails the reload command. In general, this should not be a problem since users are careful not to modify the table from Hive or Spark while Impala is reading them. In the worst case, currently the refresh command fails which can be retried by the user. However, the this does not go well with when event processing is turned on. EventProcessor tries to reload the table as soon as it sees a INSERT_EVENT from metastore. Hive may be still cleaning up the staging directories when EventProcessor issues a reload causing it go in error state. Ideally, we should have some sort of intra-engine synchronization semantics to avoid such issues, but that is much more complex architectural change. For now, we should ignore such errors and skip the deleted file from being loaded. Testing: [Pending] Unfortunately, this error is hard to reproduce locally. I tried creating multiple threads which delete some files while multiple FileMetadataLoaders are loading concurrently but it didn't fail for me so far. Will try running the TestEventProcessing.test_insert_events multiple times to confirm if I see any failure. Change-Id: Iecf6b193b0d57de27d41ad6ef6e1719005d9e908 --- M fe/src/main/java/org/apache/impala/common/FileSystemUtil.java 1 file changed, 16 insertions(+), 5 deletions(-) git pull ssh://gerrit.cloudera.org:29418/Impala-ASF refs/changes/06/14806/1 -- To view, visit http://gerrit.cloudera.org:8080/14806 To unsubscribe, visit http://gerrit.cloudera.org:8080/settings Gerrit-Project: Impala-ASF Gerrit-Branch: master Gerrit-MessageType: newchange Gerrit-Change-Id: Iecf6b193b0d57de27d41ad6ef6e1719005d9e908 Gerrit-Change-Number: 14806 Gerrit-PatchSet: 1 Gerrit-Owner: Vihang Karajgaonkar <[email protected]> Gerrit-Reviewer: Quanlong Huang <[email protected]>
