[jira] [Commented] (RANGER-3898) Bug in Ranger Roles Cache

["Ramachandran (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/RANGER-3898?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17601744#comment-17601744 ] 

Ramachandran commented on RANGER-3898:
--------------------------------------

Review is available here - https://reviews.apache.org/r/74106/

> Bug in Ranger Roles Cache
> -------------------------
>
>                 Key: RANGER-3898
>                 URL: https://issues.apache.org/jira/browse/RANGER-3898
>             Project: Ranger
>          Issue Type: Bug
>          Components: Ranger
>    Affects Versions: 3.0.0
>            Reporter: Ramachandran
>            Assignee: Ramachandran
>            Priority: Major
>
> It seems Apache Ranger open source contains a bug where else block in the below code will not be called at all 
> In the below code else block is a dead code
>  
> {code:java}
> public RangerRoles getLatestRangerRoleOrCached(String serviceName, RoleDBStore roleDBStore, Long lastKnownRoleVersion, Long rangerRoleVersionInDB) throws Exception {
>    final RangerRoles ret;
>    if (lastKnownRoleVersion == null || !lastKnownRoleVersion.equals(rangerRoleVersionInDB)) {
>       roleCacheWrapper = new RangerRoleCacheWrapper();
>       ret              = roleCacheWrapper.getLatestRangerRoles(serviceName, roleDBStore, lastKnownRoleVersion, rangerRoleVersionInDB);
>    } else if (lastKnownRoleVersion.equals(rangerRoleVersionInDB)) {
>       ret = null;
>    } else {
>       ret = roleCacheWrapper.getRoles();
>    }
>    return ret;
> }{code}
> The below behaviour also broken  
> when multiple threads are trying to access and one or more threads got timeout while acquiring the lock,it will fetch the roles from cache but ,we are not setting the roles in cache anywhere in our code 
>  
> {code}
> public RangerRoles getLatestRangerRoles(String serviceName, RoleDBStore roleDBStore, Long lastKnownRoleVersion, Long rolesVersionInDB) throws Exception {
>    RangerRoles ret           = null;
>    boolean     lockResult = false;
>    if (LOG.isDebugEnabled()) {
>       LOG.debug("==> RangerRoleCache.getLatestRangerRoles(ServiceName= " + serviceName + " lastKnownRoleVersion= " + lastKnownRoleVersion + " rolesVersionInDB= " + rolesVersionInDB + ")");
>    }
>    try {
>       lockResult = lock.tryLock(waitTimeInSeconds, TimeUnit.SECONDS);
>       if (lockResult) {
>          // We are getting all the Roles to be downloaded for now. Should do downloades for each service based on what roles are there in the policies.
>          SearchFilter          searchFilter = null;
>          final Set<RangerRole> rolesInDB    = new HashSet<>(roleDBStore.getRoles(searchFilter));
>          Date updateTime = new Date();
>          if (rolesInDB != null) {
>             ret = new RangerRoles();
>             ret.setRangerRoles(rolesInDB);
>             ret.setRoleUpdateTime(updateTime);
>             ret.setRoleVersion(rolesVersionInDB);
>             rolesVersion = rolesVersionInDB;
>          } else {
>             LOG.error("Could not get Ranger Roles from database ...");
>          }
>       } else {
>          if (LOG.isDebugEnabled()) {
>             LOG.debug("Could not get lock in [" + waitTimeInSeconds + "] seconds, returning cached RangerRoles");
>          }
>          ret = getRoles();
>       }
>    } catch (InterruptedException exception) {
>       LOG.error("RangerRoleCache.getLatestRangerRoles:lock got interrupted..", exception);
>    } finally {
>       if (lockResult) {
>          lock.unlock();
>       }
>    }
>    if (LOG.isDebugEnabled()) {
>       LOG.debug("<== RangerRoleCache.getLatestRangerRoles(ServiceName= " + serviceName + " lastKnownRoleVersion= " + lastKnownRoleVersion + " rolesVersionInDB= " + rolesVersionInDB + " RangerRoles= " + ret + ")");
>    }
>    return ret;
> }{code}



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