When janusgraph Mixed index is indexed?

Question

I use Janusgraph 0.2.0 and ES backend.

when indexed?

Once a vertex or edge is added and the transaction is successfully committed, can I consider that the mixed indexes related to the transaction are immediately available?

Or, the mixed indexes are lazily sent to backend by janusgraph after the commit (that is, eventually consistent)?

when mixed index is down

If mixed indexes are lazily sent to backend by janusgraph, when the mixed index backend is down, can I successfully commit a transaction which requires mixed indexes?

index status

If mixed indexes are lazily sent to backend indexed by, how to check the indexing state (index lag)?

Ashraful Islam · Accepted Answer · 2017-11-22T04:49:15.333

1

JanusGraph commit index backend's mutations at the time of transaction commit

There is a configuration in JanusGraph

storage.write-time : default value 100000 ms

Maximum time (in ms) to wait for a backend write operation to complete successfully. If a backend write operationfails temporarily, JanusGraph will backoff exponentially and retry the operation until the wait time has been exhausted.

The class IndexTransaction Wraps the transaction handle of an index and buffers all mutations against an index for efficiency. It will retry until the storage.write-time exceeded. After exceeding throws BackendException

edited Nov 22 '17 at 04:49

answered Nov 21 '17 at 19:19

Ashraful Islam

12,470
3
32
53

Thanks! Is there any way to check index lag? After bulk loading, I want to wait until index backend is synced. – takaomag Nov 21 '17 at 22:25
@takaomag Sorry, at first i was wrong about the index commit. Now updated answer. – Ashraful Islam Nov 22 '17 at 04:50
Thank you so much! I can go ahead. – takaomag Nov 22 '17 at 13:18

When janusgraph Mixed index is indexed?

1 Answers1