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ASF GitHub Bot commented on DRILL-4286: --------------------------------------- Github user bitblender commented on a diff in the pull request: https://github.com/apache/drill/pull/921#discussion_r148684246 --- Diff: exec/java-exec/src/main/java/org/apache/drill/exec/coord/zk/ZKClusterCoordinator.java --- @@ -70,7 +72,10 @@ private final CountDownLatch initialConnection = new CountDownLatch(1); private final TransientStoreFactory factory; private ServiceCache<DrillbitEndpoint> serviceCache; + private DrillbitEndpoint endpoint; +//private HashMap<MultiKey, DrillbitEndpoint> endpointsMap = new HashMap<MultiKey, DrillbitEndpoint>(); + private ConcurrentHashMap<MultiKey, DrillbitEndpoint> endpointsMap = new ConcurrentHashMap<MultiKey,DrillbitEndpoint>(); --- End diff -- please add a comment about what this map contains. > Have an ability to put server in quiescent mode of operation > ------------------------------------------------------------ > > Key: DRILL-4286 > URL: https://issues.apache.org/jira/browse/DRILL-4286 > Project: Apache Drill > Issue Type: New Feature > Components: Execution - Flow > Reporter: Victoria Markman > Assignee: Venkata Jyothsna Donapati > Priority: Major > > I think drill will benefit from mode of operation that is called "quiescent" > in some databases. > From IBM Informix server documentation: > {code} > Change gracefully from online to quiescent mode > Take the database server gracefully from online mode to quiescent mode to > restrict access to the database server without interrupting current > processing. After you perform this task, the database server sets a flag that > prevents new sessions from gaining access to the database server. The current > sessions are allowed to finish processing. After you initiate the mode > change, it cannot be canceled. During the mode change from online to > quiescent, the database server is considered to be in Shutdown mode. > {code} > This is different from shutdown, when processes are terminated. -- This message was sent by Atlassian JIRA (v6.4.14#64029)