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[Improvement-10617] Add comment in slot check (#10618)
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@ -207,8 +207,9 @@ public class MasterSchedulerService extends BaseDaemonThread {
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for (final Command command : commands) {
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masterPrepareExecService.execute(() -> {
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try {
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// todo: this check is not safe, the slot may change after command transform.
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// slot check again
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// Note: this check is not safe, the slot may change after command transform.
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// We use the database transaction in `handleCommand` so that we can guarantee the command will always be executed
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// by only one master
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SlotCheckState slotCheckState = slotCheck(command);
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if (slotCheckState.equals(SlotCheckState.CHANGE) || slotCheckState.equals(SlotCheckState.INJECT)) {
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logger.info("Master handle command {} skip, slot check state: {}", command.getId(), slotCheckState);
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@ -138,6 +138,7 @@ import org.apache.dolphinscheduler.spi.enums.ResourceType;
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import org.apache.commons.collections.CollectionUtils;
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import java.sql.SQLIntegrityConstraintViolationException;
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import java.util.ArrayList;
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import java.util.Arrays;
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import java.util.Date;
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@ -373,7 +374,8 @@ public class ProcessServiceImpl implements ProcessService {
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}
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/**
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* save error command, and delete original command
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* Save error command, and delete original command. If the given command has already been moved into error command,
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* will throw {@link SQLIntegrityConstraintViolationException ).
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*
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* @param command command
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* @param message message
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