Quanlong Huang has uploaded a new patch set (#7) to the change originally created by Riza Suminto. ( http://gerrit.cloudera.org:8080/23194 )
Change subject: IMPALA-14220 (part 2): Delay AcceptRequest until catalog is stable ...................................................................... IMPALA-14220 (part 2): Delay AcceptRequest until catalog is stable CatalogD availability is improving since reading is_active_ no longer requires holding catalog_lock_. However, during a failover scenario, requests may slip into the passive-turn-to-active CatalogD and obtain stale metadata. This patch improves the situation in two steps. First, it adds a new mutex ha_transition_lock_ that must be obtained by AcceptRequest() in HA mode. This mutex protects both CatalogServer::WaitHATransition() and CatalogServer::UpdateActiveCatalogd(). WaitHATransition() will only exit and return to AcceptRequest() after the triggered_first_reset_ flag is True (initial metadata reset has completed) or min_catalog_resets_to_serve_ is met. If only the latter happens, request will goes through the Catalog JVM and subsequently blocked by CatalogResetManager.waitOngoingMetadataFetch() until metadata reset has progress beyond requested database/table. Second, it increments min_catalog_resets_to_serve_ on every global reset (Invalidate Metadata) initiated by catalog-server.cc. CatalogServer::MarkPendingMetadataReset() matches this logic to increment min_catalog_resets_to_serve_ before setting triggered_first_reset_ flag to False (consequently waking up TriggerResetMetadata thread). Rename WaitForCatalogReady() to WaitCatalogReadinessForWorkloadManagement() since this wait mechanism is specific to Workload Management initialization and has stricter requirements. Removed CatalogServer::IsActive() since the only call site is replaced with CatalogServer::WaitHATransition(). Testing: Added test_metadata_after_failover_with_delayed_reset and test_metadata_after_failover_with_hms_sync. Change-Id: I370d21319335318e441ec3c3455bac4227803900 --- M be/src/catalog/catalog-server.cc M be/src/catalog/catalog-server.h M be/src/catalog/catalog.cc M be/src/catalog/catalog.h M be/src/catalog/catalogd-main.cc M be/src/catalog/workload-management-init.cc M fe/src/main/java/org/apache/impala/catalog/Catalog.java M fe/src/main/java/org/apache/impala/catalog/CatalogServiceCatalog.java M fe/src/main/java/org/apache/impala/service/CatalogOpExecutor.java M fe/src/main/java/org/apache/impala/service/JniCatalog.java M tests/custom_cluster/test_catalogd_ha.py 11 files changed, 193 insertions(+), 69 deletions(-) git pull ssh://gerrit.cloudera.org:29418/Impala-ASF refs/changes/94/23194/7 -- To view, visit http://gerrit.cloudera.org:8080/23194 To unsubscribe, visit http://gerrit.cloudera.org:8080/settings Gerrit-Project: Impala-ASF Gerrit-Branch: master Gerrit-MessageType: newpatchset Gerrit-Change-Id: I370d21319335318e441ec3c3455bac4227803900 Gerrit-Change-Number: 23194 Gerrit-PatchSet: 7 Gerrit-Owner: Riza Suminto <riza.sumi...@cloudera.com> Gerrit-Reviewer: Csaba Ringhofer <csringho...@cloudera.com> Gerrit-Reviewer: Impala Public Jenkins <impala-public-jenk...@cloudera.com> Gerrit-Reviewer: Jason Fehr <jf...@cloudera.com> Gerrit-Reviewer: Quanlong Huang <huangquanl...@gmail.com> Gerrit-Reviewer: Riza Suminto <riza.sumi...@cloudera.com> Gerrit-Reviewer: Wenzhe Zhou <wz...@cloudera.com>
