judge errno before set errsim
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		@ -241,12 +241,14 @@ int ObMediumCompactionScheduleFunc::schedule_next_medium_primary_cluster(
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  LOG_DEBUG("schedule next medium in primary cluster", K(ret), KPC(this), K(schedule_medium_flag),
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      K(schedule_major_snapshot), K(adaptive_merge_reason), KPC(last_major), K(medium_list), K(max_sync_medium_scn));
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#ifdef ERRSIM
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  if (OB_SUCC(ret)) {
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    ret = OB_E(EventTable::EN_SCHEDULE_MEDIUM_COMPACTION) ret;
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    if (OB_FAIL(ret) && tablet_.get_tablet_meta().tablet_id_.id() > ObTabletID::MIN_USER_TABLET_ID) {
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      FLOG_INFO("set schedule medium with errsim", KPC(this));
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      ret = OB_SUCCESS;
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      schedule_medium_flag = true;
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    }
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  }
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#endif
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  if (OB_FAIL(ret) || !schedule_medium_flag) {
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@ -358,11 +360,13 @@ int ObMediumCompactionScheduleFunc::decide_medium_snapshot(
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      }
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    }
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#ifdef ERRSIM
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  if (OB_SUCC(ret)) {
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    ret = OB_E(EventTable::EN_SCHEDULE_MEDIUM_COMPACTION) ret;
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    if (OB_FAIL(ret) && tablet_.get_tablet_meta().tablet_id_.id() > ObTabletID::MIN_USER_TABLET_ID) {
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      FLOG_INFO("set schedule medium with errsim", KPC(this));
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      ret = OB_SUCCESS;
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    }
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  }
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#endif
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    if (FAILEDx(prepare_medium_info(result, medium_info))) {
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      if (OB_TABLE_IS_DELETED == ret) {
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@ -620,6 +624,7 @@ int ObMediumCompactionScheduleFunc::get_table_schema_to_merge(
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    LOG_WARN("table is deleted", K(ret), K(table_id));
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  }
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#ifdef ERRSIM
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  if (OB_SUCC(ret)) {
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    static bool have_set_errno = false;
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    static ObTabletID errno_tablet_id;
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    ret = OB_E(EventTable::EN_SCHEDULE_MAJOR_GET_TABLE_SCHEMA) ret;
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@ -634,6 +639,7 @@ int ObMediumCompactionScheduleFunc::get_table_schema_to_merge(
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        ret = OB_SUCCESS;
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      }
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    }
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  }
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#endif
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  if (FAILEDx(medium_info.storage_schema_.init(
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    allocator,
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@ -754,10 +760,12 @@ int ObMediumCompactionScheduleFunc::check_medium_checksum_table(
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      }
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    }
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#ifdef ERRSIM
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    if (OB_SUCC(ret)) {
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      ret = OB_E(EventTable::EN_MEDIUM_REPLICA_CHECKSUM_ERROR) OB_SUCCESS;
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      if (OB_FAIL(ret)) {
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        STORAGE_LOG(INFO, "ERRSIM EN_MEDIUM_REPLICA_CHECKSUM_ERROR", K(ret), K(ls_id), K(tablet_id));
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      }
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    }
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#endif
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    if (OB_CHECKSUM_ERROR == ret) {
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      int tmp_ret = OB_SUCCESS;
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@ -1343,11 +1343,13 @@ int ObAdaptiveMergePolicy::find_meta_major_tables(
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    }
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#ifdef ERRSIM
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  if (OB_NO_NEED_MERGE = ret) {
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    ret = OB_E(EventTable::EN_SCHEDULE_MEDIUM_COMPACTION) ret;
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    if (OB_FAIL(ret) && tablet.get_tablet_meta().tablet_id_.id() > ObTabletID::MIN_USER_TABLET_ID) {
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      FLOG_INFO("set schedule medium with errsim", "tablet_id", tablet.get_tablet_meta().tablet_id_);
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      ret = OB_SUCCESS;
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    }
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  }
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#endif
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  }
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