/api/stats/region_clients

Returns information about the various HBase region server clients in AsyncHBase. This helps to identify issues with a particular region server. (v2.2)

Verbs

• GET

Requests

No parameters available.

Example Request

Query String

http://localhost:4242/api/stats/region_clients

Response

The response is an array of objects. Fields in the response include:

Name	Data Type	Description	Example
pendingBreached	Integer	The total number of times writes to a new region client were discarded because it’s pending RPC buffer was full. This should almost always be zero and a positive value indicates the TSD took a long time to connect to a region server.	0
writesBlocked	Integer	How many RPCs (batched or individual) in total were blocked due to the connection’s send buffer being full. A positive value indicates a slow HBase server or poor network performance.	0
inflightBreached	Integer	The total number of times RPCs were blocked due to too many outstanding RPCs waiting for a response from HBase. A positive value indicates the region server is slow or network performance is poor.	0
dead	Boolean	Whether or not the region client is marked as dead due to a connection close event (such as region server going down)	false
rpcsInFlight	Integer	The current number of RPCs sent to HBase and awaiting a response.	10
rpcsSent	Integer	The total number of RPCs sent to HBase.	424242
rpcResponsesUnknown	Integer	The total number of responses received from HBase for which we couldn’t find an RPC. This may indicate packet corruption or an incompatible HBase version.	0
pendingBatchedRPCs	Integer	The number of RPCs queued in the batched RPC awaiting the next flush or the batch limit.	0
endpoint	String	The IP and port of the region server in the format ‘/<ip>:<port>’	/127.0.0.1:35008
rpcResponsesTimedout	Integer	The total number of responses from HBase for RPCs that have previously timedout. This means HBase may be catching up and responding to stale RPCs.	0
rpcid	Integer	The ID of the last RPC sent to HBase. This may be a negative number	42
rpcsTimedout	Integer	The total number of RPCs that have timed out. This may indicate a slow region server, poor network performance or GC issues with the TSD.	0
pendingRPCs	Integer	The number of RPCs queued and waiting for the connection handshake with the region server to complete	0

Example Response

[
    {
        "pendingBreached": 0,
        "writesBlocked": 0,
        "inflightBreached": 0,
        "dead": false,
        "rpcsInFlight": 0,
        "rpcsSent": 35704,
        "rpcResponsesUnknown": 0,
        "pendingBatchedRPCs": 452,
        "endpoint": "/127.0.0.1:35008",
        "rpcResponsesTimedout": 0,
        "rpcid": 35703,
        "rpcsTimedout": 0,
        "pendingRPCs": 0
    }
]