4117
When using Multi-Transport Threads, a deadlock was possible if you deleted a receiver at the same moment a transport session began or ended. An alternative locking mechanism has been implemented to prevent a deadlock when you create new transport sessions or delete old transport sessions using the same transport thread as a deleted receiver. Note: This solution was erroneously cited as being made in the LBM 4.2.3 release. It is effective with the LBM 4.2.4 release.
4612
4623
4624
4625
When using the UM Gateway Informatica recommends that you do not enable the Multi-Transport Threads feature. Informatica does not support nor test the operation of Multi-Transport Threads across the UM Gateway.
Multi-Transport Threads do not support persistent stores (UMP) or queues (UMQ).
When using Event Queues with the Java API on Mac OS X kernel 9.4, core dumps have occurred. Mac OS X kernel versions prior to 9.4 have not produced this behavior. Informatica is investigating this issue.
When using LBT-IPC, a seg fault can occur when sending messages larger than 65,535 bytes when ordered_delivery has been set to 0 (zero). The seg fault occurs when fragments are lost. Setting transport_lbtipc_behavior to receiver_paced avoids the seg fault by eliminating loss. Informatica is investigating this issue.
When using the LBT-RDMA transport with Java applications, a segfault can occur if you kill a receiver with Ctrl-C. As a workaround, use the JVM option, -Xrs. Informatica is investigating this problem.
If you use the current version of VMS (3.2.8), UMS 4.1 issues the following warning: LOG Level 5: LBT-RDMA: VMS Logger Message (Error): vmss_create_store: 196[E] vms_listen: rdma_bind_addr failed (r=-1). This warning indicates that rdma_bind failed for ethernet interfaces, which is expected behavior. Currently, VMS attempts rdma_bind on all interfaces. When released, VMS version 3.2.9 will only run rdma_bind on infiniband-capable interfaces.
When using Automatic Monitoring with ud_acceleration and the epoll file descriptor option, UMS may leave a monitoring thread running after context deletion. This situation produces the following error: VMA ERROR : epoll_wait_call:36:epoll_wait_call() epfd 48 not found. Informatica is investigating this problem.
A requesting application using a UM Gateway may not receive the expected number of responses. The problem occurs if the responses exceed the maximum datagram size, are fragmented and the gateway must forward simultaneous fragmented responses. In this case the fragments may become intermingled and result in a response not being delivered as expected. The requesting application receives a warning similar to: WARNING: failed assertion [offset==0] at line 1627 in ../../../../src/lib/lbm/lbmqr.c. Informatica is investigating this problem.
At the present time, 32-bit applications cannot interact with 64-bt applications using the LBT-IPC transport. As a result, a 64-bit UM Gateway cannot interact with a 32-bit application using LBT-IPC. It can only interact with a 64-bit application. Likewise, a 32-bit UM Gateway can only interact with a 32-bit application.
The UM Gateway does not currently support queuing at this time, only streaming and persistence. This will be resolved in a future release.
The UM Gateway is not supported as a standalone Windows service at this time. This will be resolved in a future release.
When using the UM Gateway in a four gateway "full-mesh" configuration (i.e., all gateways connected) the following instabilities have been observed.
Requesting applications can receive multiple or unending responses.
Restarting a single gateway has resulted in the crash of other gateways.
Running the same set of tests simultaneously in 2 opposite directions over a set of gateways causes fatal asserts in the UM Gateways. Although this is not a typical user configuration, more complex gateway configurations could simulate this effect. The UM Gateway is designed to successfully forward the same set of topic messages sent both ways across a set of gateways.
These behaviors have not been seen in other, more typical gateway configurations. Informatica is investigating this problem.
Under certain extreme conditions manufactured by configuring atypically low timeout settings, the UM Gateway has been observed to terminate with various fatal assertions. We believe this to be the result of a race condition exploited by the unusually low timer settings. This issue has not been seen with less aggressive or default timer settings. Informatica continues to investigate this problem.
In some cases, a UM Gateway instance does not establish a reliable peer connection with another UM Gateway instance residing on the same Solaris 64-bit host. At this time, Informatica does not recommend configuring 1 or more peer-connected gateway instances on a single Solaris 64-bit host. Informatica continues to investigate this problem.
If using LBT-RDMA across the UM Gateway and you exit the gateway with Ctrl-C, you may see a segfault. Informatica is aware of this and has not observed any ill effects from this segfault.
When using the UM Gateway in a failover configuration using LBT-RDMA, if the gateways experience multiple failures, receivers may experience deafness (unable to discovers sources). For this to occur, all gateways must fail once and at least one gateway must fail more than once.
Informatica has discovered that simultaneous event processing that involves EOS's and topic advertisements (TIR) combined with receiver deletes can cause an application to crash when using Multi-Transport Threads. Applications which routinely create and destroy receivers as part of normal running should disable Multi-Transport Threads to avoid this risk. Informatica is working on a solution.
No specific UMP problems were discovered.
Receivers using event queues and Spectrum with UMP can experience a SIGSEGV while shutting down if events still exist on the event queue when it is deleted. As a workaround, use LBM_EVQ_BLOCK when dispatching event queues. During application shutdown, call lbm_evq_unblock() after deleting receivers associated with the event queue, but before deleting any context objects. Once the dispatch thread exits, it is safe to proceed with context deletion. 29West is working on a solution to this problem.
When running a store on a Solaris machine, you may experience registration failures after a few minutes. The store repeatedly reports the error, [WARNING]: wait returned error 4 [select: (22) Invalid argument]. Changing fd_management_type to devpoll prevents this problem. Informatica is investigating this problem.
UMP proxy source elections can only occur among stores in the same topic resolution domain connected directly via peer links. Informatica is investigating this problem.
No specific UMQ problems were discovered.
| Prev | Home | Next |
| Release LBM 4.2.5 / UME 3.2.5 / UMQ 2.1.5 - June 2011 | Release LBM 4.2.3 / UME 3.2.3 / UMQ 2.1.3 - April 2011 |
Copyright (c) 2004 - 2014 Informatica Corporation. All rights reserved.