What is exactly is the content index and why does it it fail

Hi folks, so i have a client with a two member 2010 dag, across two continents. When i look at databases in Site A, i see all databases healthy, one of these databases has over 280 logs in the copy que, and 1 in the replay queue and 2 databases with its content index status failed.
In Site B, all mounted all queues 0. Content index good
Also Test-ReplicationHealth on Site A, says  "DBLogCopyKeepingUp         *FAILED*   Log copy and inspection for database...." all others passed. but passed for SiteB

So my questions are,
A) what does error mean, (i'm thing latency so it its not getting logs on time)?
B) what is the content index exactly and why does it fail?
C) would reseeding the catalagoue files have any impact to the users?
D) What exactly is replay queue ?
Raymond BrooksAsked:
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imkotteesSenior Messaging EngineerCommented:
A) what does error mean, (i'm thing latency so it its not getting logs on time)?
DBLogCopyKeepingUp
Verifies that log copying and inspection by the passive copies of databases on the specified DAG member, or if no DAG member is specified, on the local server, are able to keep up with log generation activity on the active copy.

B) what is the content index exactly and why does it fail?
This will index the entire database and it will be used when users are doing online search in outlook/owa. It may fail due to various reasons like missing the sequence & etc.,
C) would reseeding the catalagoue files have any impact to the users?
No impact to the users.
D) What exactly is replay queue ?
The amount of logs that needs to be written into the database.
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Raymond BrooksAuthor Commented:
Well lets focus on A-DBCopy. What would cause DBLogCopyKeepingUp to ...not keep up?
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imkotteesSenior Messaging EngineerCommented:
Network, bandwidth, I/O issues & etc.,
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