Java client read throws "Error Code -2: Unexpected batch key returned: null,,0"

Client Libraries Java Client
,
1

I am seeing an Aerospike Java client read error when reading a record from Aerospike Enterprise server.

Aerospike Java client: 4.0.4 (I agree this is an old version. I will upgrade to later version, but I still want to understand this error, since there is a topic on how the clients are backward compatible - Java client and server compatibility matrix).

Aerospike server: Enterprise Edition 5.7

The record I write into the server has the key - "tl:null:t034001118454:4d7dcd9166211b445fc6890aad2b28192d7b42f8".

I verified that the record is added to the server (it is a fresh installation, so there is only one record).

aql> set output json
OUTPUT = JSON
aql> set record_print_metadata true
RECORD_PRINT_METADATA = true
aql> select * from tl;

[
    [
        {
          "edigest": "TX3NkWYhG0RfxokKrSsoGS17Qvg=",
          "ttl": 172395,
          "gen": 5,
          "bins": {
            "": "78 9C 63 64 60 60 60 34 36 D1 33 30 D8 A8 6B 68 68 A1 67 62 BA A5 29 1D 2C 66 64 50 61 BA 01 C4 32 00 01 C3 78 30 B5 11 85 C3 C0 C0 74 18 A2 0E 00 F5 C5 0F 91"
          }
        }
    ],
    [
        {
          "Status": 0
        }
    ]
]

When I read the record with the Java client (same application, 4.0.4 version client), I get the following error:

2022-02-14 18:10:56.006	ERROR	com.cache.AerospikeService	Error Code -2: Unexpected batch key returned: null,,0
com.aerospike.client.AerospikeException$Parse: Error Code -2: Unexpected batch key returned: null,,0
	at com.aerospike.client.command.Batch$GetArrayCommand.parseRow(Batch.java:109)
	at com.aerospike.client.command.MultiCommand.parseGroup(MultiCommand.java:107)
	at com.aerospike.client.command.MultiCommand.parseResult(MultiCommand.java:64)
	at com.aerospike.client.command.SyncCommand.execute(SyncCommand.java:83)
	at com.aerospike.client.command.BatchExecutor.execute(BatchExecutor.java:51)
	at com.aerospike.client.AerospikeClient.get(AerospikeClient.java:1023)
	at com.cache.AerospikeService.find(AerospikeService.java:179)

What is the reason for this error? I verified the same key is used for the read and write operation.

2

It should be because the server is not returning the digests anymore for batch transactions. So you would have explicitly configure the client as per the 5.7 server release notes:

“The configuration parameter batch-without-digests , now defaults to true, is deprecated and will be removed in six months. Customers using clients older than a year (around the time of Server 4.9 which introduced batch-without-digests ) will now have to explicitly set the batch-without-digests configuration item to false.”

1 Like
3

@meher thanks for the reply. So even if I enable the configuration parameter batch-without-digests , I still need to upgrade the Java client to 4.4.5, since this option only works with 4.4.5. Is that correct?

From the docs:

Note: To use batch-without-digests , the minimum client versions required are as follows:

  • Java client version 4.4.5
4

Oh, yes, good catch. You would indeed have to upgrade the client.

1 Like
5

This topic was automatically closed 84 days after the last reply. New replies are no longer allowed.