diff --git a/download.html b/download.html
index 94856c7..6f8354f 100644
--- a/download.html
+++ b/download.html
@@ -71,8 +71,8 @@
 <header id="header" class="affix header sticky-top shrink" data-spy="affix" data-offset-top="0">
     <div id="promotion-bar">
         <p>
-            Tech Talk, July 28th: <a href="https://www.meetup.com/Apache-Ignite-Virtual-Meetup/events/271602652/" rel="noopener" target="_blank">
-            Apache Ignite Best Practices for Native Persistence and Data Recovery</a>
+            Tech Talk, August 11th: <a href="https://www.meetup.com/Apache-Ignite-Virtual-Meetup/events/271602652/" rel="noopener" target="_blank">
+            Designing Serverless Blockchain Network With Apache Ignite</a>
         </p>
     </div>
     <div class="container">
diff --git a/hs_err_pid10882.log b/hs_err_pid10882.log
new file mode 100644
index 0000000..411212a
--- /dev/null
+++ b/hs_err_pid10882.log
@@ -0,0 +1,726 @@
+#
+# A fatal error has been detected by the Java Runtime Environment:
+#
+#  SIGSEGV (0xb) at pc=0x000000010bf0c027, pid=10882, tid=0x000000000000cc07
+#
+# JRE version: Java(TM) SE Runtime Environment (8.0_191-b12) (build 1.8.0_191-b12)
+# Java VM: Java HotSpot(TM) 64-Bit Server VM (25.191-b12 mixed mode bsd-amd64 compressed oops)
+# Problematic frame:
+# C  [libawt_lwawt.dylib+0x1c027]  OGLSD_SetScratchSurface+0x49
+#
+# Failed to write core dump. Core dumps have been disabled. To enable core dumping, try "ulimit -c unlimited" before starting Java again
+#
+# If you would like to submit a bug report, please visit:
+#   http://bugreport.java.com/bugreport/crash.jsp
+# The crash happened outside the Java Virtual Machine in native code.
+# See problematic frame for where to report the bug.
+#
+
+---------------  T H R E A D  ---------------
+
+Current thread (0x00007f945f9f4800):  JavaThread "Java2D Queue Flusher" daemon [_thread_in_native, id=52231, stack(0x0000700008ef6000,0x0000700008ff6000)]
+
+siginfo: si_signo: 11 (SIGSEGV), si_code: 1 (SEGV_MAPERR), si_addr: 0x0000000000000002
+
+Registers:
+RAX=0x00000000ffffffff, RBX=0x0000000000000002, RCX=0x0000000000000047, RDX=0x000000010bf2db14
+RSP=0x0000700008ff57f0, RBP=0x0000700008ff5810, RSI=0x00007f94615ec810, RDI=0x00007f945f9f49f8
+R8 =0x00000000000008ac, R9 =0xffffffff00000000, R10=0x0000000112a50c78, R11=0x00000001139a9000
+R12=0x0000000000000000, R13=0x0000700008ff59a8, R14=0x00007f945f9f49f8, R15=0x00007f945f9f4800
+RIP=0x000000010bf0c027, EFLAGS=0x0000000000010202, ERR=0x0000000000000004
+  TRAPNO=0x000000000000000e
+
+Top of Stack: (sp=0x0000700008ff57f0)
+0x0000700008ff57f0:   00007f94615ec810 0000000000000000
+0x0000700008ff5800:   00007f9460182c10 00007f945f9f4800
+0x0000700008ff5810:   0000700008ff5890 000000010bf2d5f2
+0x0000700008ff5820:   00007f945ef5de00 0000000200000001
+0x0000700008ff5830:   0000700008ff5920 0000000112d4aa00
+0x0000700008ff5840:   0000000000000000 0000000000000000
+0x0000700008ff5850:   0000700008ff5890 00007f9460182c20
+0x0000700008ff5860:   0000000700eb9b68 00007f945f9f49f8
+0x0000700008ff5870:   0000000156cbb1a8 0000000000000000
+0x0000700008ff5880:   0000700008ff5a28 00007f945f9f4800
+0x0000700008ff5890:   0000700008ff58e0 0000000112a50cea
+0x0000700008ff58a0:   00000007b0307200 000000010653bdb4
+0x0000700008ff58b0:   0000000000000064 0000000000000000
+0x0000700008ff58c0:   0000000000000064 00007f945ef5d698
+0x0000700008ff58d0:   0000700008ff5930 00000001063517a8
+0x0000700008ff58e0:   0000700008ff5a00 000000011343fafc
+0x0000700008ff58f0:   0000000000000001 00007f945ef5e590
+0x0000700008ff5900:   00000007b0307200 00007f945f9f4800
+0x0000700008ff5910:   00007f945f9f4800 0000000107bf9a00
+0x0000700008ff5920:   0000700008ff5a28 00007f945f9f4800
+0x0000700008ff5930:   0000700008ff5980 000000011281d228
+0x0000700008ff5940:   00000007b0307200 00000001129fbd26
+0x0000700008ff5950:   0000700008ff5a00 00000001139a905c
+0x0000700008ff5960:   000000015ba5688f 0000700008ff59a8
+0x0000700008ff5970:   000000015ba56910 0000000000000000
+0x0000700008ff5980:   0000700008ff5a00 00000001126592bd
+0x0000700008ff5990:   0000700008ff5a00 00000001126592bd
+0x0000700008ff59a0:   00000001126592bd 00000007b0307200
+0x0000700008ff59b0:   0000000000000003 00000007b0307288
+0x0000700008ff59c0:   0000700008ff59b0 00000001083435b1
+0x0000700008ff59d0:   0000700008ff5a28 0000000108345828
+0x0000700008ff59e0:   0000000000000000 00000001083436b8 
+
+Instructions: (pc=0x000000010bf0c027)
+0x000000010bf0c007:   c0 e9 82 00 00 00 48 8b 5e 10 48 85 db 75 0e bf
+0x000000010bf0c017:   01 00 00 00 48 8d 15 a8 96 03 00 eb d6 49 89 fe
+0x000000010bf0c027:   4c 8b 3b 30 c0 e8 ff bc 02 00 49 8b 3f 49 89 c4
+0x000000010bf0c037:   48 8b 35 02 29 06 00 30 c0 e8 0b be 02 00 48 85 
+
+Register to memory mapping:
+
+RAX=0x00000000ffffffff is an unknown value
+RBX=0x0000000000000002 is an unknown value
+RCX=0x0000000000000047 is an unknown value
+RDX=0x000000010bf2db14: Java_sun_java2d_opengl_OGLRenderQueue_flushBuffer+0xb5c in /Library/Java/JavaVirtualMachines/jdk1.8.0_191.jdk/Contents/Home/jre/lib/libawt_lwawt.dylib at 0x000000010bef0000
+RSP=0x0000700008ff57f0 is pointing into the stack for thread: 0x00007f945f9f4800
+RBP=0x0000700008ff5810 is pointing into the stack for thread: 0x00007f945f9f4800
+RSI=0x00007f94615ec810 is an unknown value
+RDI=0x00007f945f9f49f8 is an unknown value
+R8 =0x00000000000008ac is an unknown value
+R9 =0xffffffff00000000 is an unknown value
+R10=0x0000000112a50c78 is at entry_point+56 in (nmethod*)0x0000000112a50ad0
+R11=0x00000001139a9000 is at entry_point+0 in (nmethod*)0x00000001139a8e90
+R12=0x0000000000000000 is an unknown value
+R13=0x0000700008ff59a8 is pointing into the stack for thread: 0x00007f945f9f4800
+R14=0x00007f945f9f49f8 is an unknown value
+R15=0x00007f945f9f4800 is a thread
+
+
+Stack: [0x0000700008ef6000,0x0000700008ff6000],  sp=0x0000700008ff57f0,  free space=1021k
+Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
+C  [libawt_lwawt.dylib+0x1c027]  OGLSD_SetScratchSurface+0x49
+C  [libawt_lwawt.dylib+0x3d5f2]  Java_sun_java2d_opengl_OGLRenderQueue_flushBuffer+0x63a
+J 4813  sun.java2d.opengl.OGLRenderQueue.flushBuffer(JI)V (0 bytes) @ 0x0000000112a50cea [0x0000000112a50c40+0xaa]
+J 5046 C1 sun.java2d.opengl.OGLRenderQueue.flushBuffer()V (41 bytes) @ 0x000000011343fafc [0x000000011343f8a0+0x25c]
+J 7444 C1 sun.java2d.opengl.OGLRenderQueue.access$100(Lsun/java2d/opengl/OGLRenderQueue;)V (5 bytes) @ 0x00000001139a905c [0x00000001139a9000+0x5c]
+j  sun.java2d.opengl.OGLRenderQueue$QueueFlusher.run()V+81
+v  ~StubRoutines::call_stub
+V  [libjvm.dylib+0x2ef9fe]
+V  [libjvm.dylib+0x2f01a2]
+V  [libjvm.dylib+0x2f034e]
+V  [libjvm.dylib+0x34ac3d]
+V  [libjvm.dylib+0x56f83f]
+V  [libjvm.dylib+0x570f3a]
+V  [libjvm.dylib+0x48e0be]
+C  [libsystem_pthread.dylib+0x5e65]  _pthread_start+0x94
+C  [libsystem_pthread.dylib+0x183b]  thread_start+0xf
+C  0x0000000000000000
+
+Java frames: (J=compiled Java code, j=interpreted, Vv=VM code)
+J 4813  sun.java2d.opengl.OGLRenderQueue.flushBuffer(JI)V (0 bytes) @ 0x0000000112a50c78 [0x0000000112a50c40+0x38]
+J 5046 C1 sun.java2d.opengl.OGLRenderQueue.flushBuffer()V (41 bytes) @ 0x000000011343fafc [0x000000011343f8a0+0x25c]
+J 7444 C1 sun.java2d.opengl.OGLRenderQueue.access$100(Lsun/java2d/opengl/OGLRenderQueue;)V (5 bytes) @ 0x00000001139a905c [0x00000001139a9000+0x5c]
+j  sun.java2d.opengl.OGLRenderQueue$QueueFlusher.run()V+81
+v  ~StubRoutines::call_stub
+
+---------------  P R O C E S S  ---------------
+
+Java Threads: ( => current thread )
+  0x00007f9466653800 JavaThread "JMX client heartbeat 7" daemon [_thread_blocked, id=130563, stack(0x000070000a7c1000,0x000070000a8c1000)]
+  0x00007f945f27c800 JavaThread "RMI RenewClean-[192.168.1.64:53806]" daemon [_thread_blocked, id=130823, stack(0x000070000a6be000,0x000070000a7be000)]
+  0x00007f945f053000 JavaThread "pool-9-thread-1" [_thread_blocked, id=62731, stack(0x000070000a5bb000,0x000070000a6bb000)]
+  0x00007f9460bb4000 JavaThread "RMI RenewClean-[192.168.1.64:53739]" daemon [_thread_blocked, id=19559, stack(0x000070000a1af000,0x000070000a2af000)]
+  0x00007f945fd72800 JavaThread "pool-8-thread-1" [_thread_blocked, id=64235, stack(0x0000700009791000,0x0000700009891000)]
+  0x00007f945f89d000 JavaThread "RMI RenewClean-[192.168.1.64:53591]" daemon [_thread_blocked, id=60711, stack(0x0000700009997000,0x0000700009a97000)]
+  0x00007f945f0e0800 JavaThread "RMI RenewClean-[192.168.1.64:52824]" daemon [_thread_blocked, id=67987, stack(0x00007000091ff000,0x00007000092ff000)]
+  0x00007f945f86d000 JavaThread "RMI RenewClean-[192.168.1.64:52445]" daemon [_thread_blocked, id=65191, stack(0x000070000a3b5000,0x000070000a4b5000)]
+  0x00007f9460d89800 JavaThread "pool-4-thread-1" [_thread_blocked, id=71319, stack(0x000070000a2b2000,0x000070000a3b2000)]
+  0x00007f94608c0800 JavaThread "RMI Scheduler(0)" daemon [_thread_blocked, id=60539, stack(0x000070000a0ac000,0x000070000a1ac000)]
+  0x00007f945f2f3000 JavaThread "GC Daemon" daemon [_thread_blocked, id=65539, stack(0x0000700009fa9000,0x000070000a0a9000)]
+  0x00007f9460530800 JavaThread "RMI RenewClean-[192.168.1.64:52498]" daemon [_thread_blocked, id=66155, stack(0x0000700009ea6000,0x0000700009fa6000)]
+  0x00007f9460d00800 JavaThread "pool-3-thread-1" [_thread_blocked, id=60087, stack(0x0000700009da3000,0x0000700009ea3000)]
+  0x00007f9460949800 JavaThread "Timer-0" daemon [_thread_blocked, id=66563, stack(0x0000700009ca0000,0x0000700009da0000)]
+  0x00007f945fcc8800 JavaThread "pool-2-thread-1" [_thread_blocked, id=59395, stack(0x0000700009b9d000,0x0000700009c9d000)]
+  0x00007f945f5e5000 JavaThread "Thread-1" daemon [_thread_blocked, id=59139, stack(0x0000700009a9a000,0x0000700009b9a000)]
+  0x00007f945f4cd800 JavaThread "DestroyJavaVM" [_thread_blocked, id=10243, stack(0x00007000076a2000,0x00007000077a2000)]
+  0x00007f945f98b800 JavaThread "TimerQueue" daemon [_thread_blocked, id=32559, stack(0x0000700009488000,0x0000700009588000)]
+  0x00007f945f3bf800 JavaThread "File Watcher" daemon [_thread_blocked, id=69687, stack(0x0000700009385000,0x0000700009485000)]
+  0x00007f94608ea000 JavaThread "AWT-EventQueue-0" [_thread_blocked, id=54535, stack(0x00007000090fc000,0x00007000091fc000)]
+  0x00007f94608cb800 JavaThread "Java2D Disposer" daemon [_thread_blocked, id=53783, stack(0x0000700008ff9000,0x00007000090f9000)]
+=>0x00007f945f9f4800 JavaThread "Java2D Queue Flusher" daemon [_thread_in_native, id=52231, stack(0x0000700008ef6000,0x0000700008ff6000)]
+  0x00007f945f1e9000 JavaThread "RequestProcessor queue manager" daemon [_thread_blocked, id=76555, stack(0x0000700008df3000,0x0000700008ef3000)]
+  0x00007f9460120000 JavaThread "AWT-Shutdown" [_thread_blocked, id=26663, stack(0x0000700008961000,0x0000700008a61000)]
+  0x00007f9460877000 JavaThread "AppKit Thread" daemon [_thread_in_native, id=775, stack(0x00007ffee9d9a000,0x00007ffeea59a000)]
+  0x00007f945f189000 JavaThread "CLI Requests Server" daemon [_thread_in_native, id=15619, stack(0x0000700008758000,0x0000700008858000)]
+  0x00007f945f158800 JavaThread "Active Reference Queue Daemon" daemon [_thread_blocked, id=17155, stack(0x0000700008655000,0x0000700008755000)]
+  0x00007f945f804000 JavaThread "Service Thread" daemon [_thread_blocked, id=15107, stack(0x000070000844f000,0x000070000854f000)]
+  0x00007f9460802000 JavaThread "C1 CompilerThread2" daemon [_thread_blocked, id=14595, stack(0x000070000834c000,0x000070000844c000)]
+  0x00007f9460801800 JavaThread "C2 CompilerThread1" daemon [_thread_blocked, id=18435, stack(0x0000700008249000,0x0000700008349000)]
+  0x00007f9460053800 JavaThread "C2 CompilerThread0" daemon [_thread_blocked, id=18691, stack(0x0000700008146000,0x0000700008246000)]
+  0x00007f9460003000 JavaThread "Signal Dispatcher" daemon [_thread_blocked, id=18947, stack(0x0000700008043000,0x0000700008143000)]
+  0x00007f946002f800 JavaThread "Finalizer" daemon [_thread_blocked, id=11523, stack(0x0000700007db7000,0x0000700007eb7000)]
+  0x00007f9460001800 JavaThread "Reference Handler" daemon [_thread_blocked, id=20995, stack(0x0000700007cb4000,0x0000700007db4000)]
+
+Other Threads:
+  0x00007f945f01b800 VMThread [stack: 0x0000700007bb1000,0x0000700007cb1000] [id=21251]
+  0x00007f9460053000 WatcherThread [stack: 0x0000700008552000,0x0000700008652000] [id=17667]
+
+VM state:not at safepoint (normal execution)
+
+VM Mutex/Monitor currently owned by a thread: None
+
+Heap:
+ PSYoungGen      total 68608K, used 11382K [0x00000007bab00000, 0x00000007bff80000, 0x00000007c0000000)
+  eden space 51712K, 1% used [0x00000007bab00000,0x00000007babac730,0x00000007bdd80000)
+  from space 16896K, 63% used [0x00000007bef00000,0x00000007bf971168,0x00000007bff80000)
+  to   space 17408K, 0% used [0x00000007bdd80000,0x00000007bdd80000,0x00000007bee80000)
+ ParOldGen       total 87040K, used 25788K [0x00000007b0000000, 0x00000007b5500000, 0x00000007bab00000)
+  object space 87040K, 29% used [0x00000007b0000000,0x00000007b192f268,0x00000007b5500000)
+ Metaspace       used 43147K, capacity 46234K, committed 46540K, reserved 1089536K
+  class space    used 6405K, capacity 7256K, committed 7372K, reserved 1048576K
+
+Card table byte_map: [0x0000000105728000,0x00000001057a9000] byte_map_base: 0x00000001019a8000
+
+Marking Bits: (ParMarkBitMap*) 0x00000001068f9e00
+ Begin Bits: [0x0000000107374000, 0x0000000107774000)
+ End Bits:   [0x0000000107774000, 0x0000000107b74000)
+
+Polling page: 0x0000000105716000
+
+CodeCache: size=245760Kb used=20784Kb max_used=21076Kb free=224975Kb
+ bounds [0x0000000112651000, 0x0000000113b11000, 0x0000000121651000]
+ total_blobs=7180 nmethods=6444 adapters=646
+ compilation: enabled
+
+Compilation events (10 events):
+Event: 3297.308 Thread 0x00007f9460053800 8066       4       java.lang.Integer::parseInt (7 bytes)
+Event: 3297.331 Thread 0x00007f9460053800 nmethod 8066 0x0000000113792490 code [0x0000000113792660, 0x0000000113792ca8]
+Event: 3499.067 Thread 0x00007f9460802000 8067       3       java.util.WeakHashMap$HashIterator::<init> (41 bytes)
+Event: 3499.070 Thread 0x00007f9460802000 nmethod 8067 0x0000000112dc4790 code [0x0000000112dc4920, 0x0000000112dc4e08]
+Event: 3679.340 Thread 0x00007f9460802000 8068  s    3       java.io.FileDescriptor::attach (73 bytes)
+Event: 3679.346 Thread 0x00007f9460802000 nmethod 8068 0x00000001131dac90 code [0x00000001131daea0, 0x00000001131dbb08]
+Event: 3859.352 Thread 0x00007f9460802000 8069       3       java.io.FileDescriptor::<init> (10 bytes)
+Event: 3859.353 Thread 0x00007f9460802000 nmethod 8069 0x0000000112e16650 code [0x0000000112e167c0, 0x0000000112e16970]
+Event: 4081.128 Thread 0x00007f9460802000 8070       1       java.lang.ref.Reference::clear (6 bytes)
+Event: 4081.128 Thread 0x00007f9460802000 nmethod 8070 0x00000001131da9d0 code [0x00000001131dab20, 0x00000001131dac50]
+
+GC Heap History (10 events):
+Event: 818.051 GC heap before
+{Heap before GC invocations=42 (full 6):
+ PSYoungGen      total 72704K, used 72425K [0x00000007bab00000, 0x00000007c0000000, 0x00000007c0000000)
+  eden space 62464K, 100% used [0x00000007bab00000,0x00000007be800000,0x00000007be800000)
+  from space 10240K, 97% used [0x00000007be800000,0x00000007bf1ba6d0,0x00000007bf200000)
+  to   space 13312K, 0% used [0x00000007bf300000,0x00000007bf300000,0x00000007c0000000)
+ ParOldGen       total 87040K, used 22895K [0x00000007b0000000, 0x00000007b5500000, 0x00000007bab00000)
+  object space 87040K, 26% used [0x00000007b0000000,0x00000007b165be70,0x00000007b5500000)
+ Metaspace       used 42877K, capacity 45932K, committed 46284K, reserved 1087488K
+  class space    used 6382K, capacity 7237K, committed 7372K, reserved 1048576K
+Event: 818.067 GC heap after
+Heap after GC invocations=42 (full 6):
+ PSYoungGen      total 71680K, used 9727K [0x00000007bab00000, 0x00000007c0000000, 0x00000007c0000000)
+  eden space 58368K, 0% used [0x00000007bab00000,0x00000007bab00000,0x00000007be400000)
+  from space 13312K, 73% used [0x00000007bf300000,0x00000007bfc7ffd8,0x00000007c0000000)
+  to   space 14336K, 0% used [0x00000007be400000,0x00000007be400000,0x00000007bf200000)
+ ParOldGen       total 87040K, used 22895K [0x00000007b0000000, 0x00000007b5500000, 0x00000007bab00000)
+  object space 87040K, 26% used [0x00000007b0000000,0x00000007b165be70,0x00000007b5500000)
+ Metaspace       used 42877K, capacity 45932K, committed 46284K, reserved 1087488K
+  class space    used 6382K, capacity 7237K, committed 7372K, reserved 1048576K
+}
+Event: 892.251 GC heap before
+{Heap before GC invocations=43 (full 6):
+ PSYoungGen      total 71680K, used 68095K [0x00000007bab00000, 0x00000007c0000000, 0x00000007c0000000)
+  eden space 58368K, 100% used [0x00000007bab00000,0x00000007be400000,0x00000007be400000)
+  from space 13312K, 73% used [0x00000007bf300000,0x00000007bfc7ffd8,0x00000007c0000000)
+  to   space 14336K, 0% used [0x00000007be400000,0x00000007be400000,0x00000007bf200000)
+ ParOldGen       total 87040K, used 22895K [0x00000007b0000000, 0x00000007b5500000, 0x00000007bab00000)
+  object space 87040K, 26% used [0x00000007b0000000,0x00000007b165be70,0x00000007b5500000)
+ Metaspace       used 42877K, capacity 45932K, committed 46284K, reserved 1087488K
+  class space    used 6382K, capacity 7237K, committed 7372K, reserved 1048576K
+Event: 892.295 GC heap after
+Heap after GC invocations=43 (full 6):
+ PSYoungGen      total 68608K, used 9758K [0x00000007bab00000, 0x00000007c0000000, 0x00000007c0000000)
+  eden space 58368K, 0% used [0x00000007bab00000,0x00000007bab00000,0x00000007be400000)
+  from space 10240K, 95% used [0x00000007be400000,0x00000007bed87b88,0x00000007bee00000)
+  to   space 14848K, 0% used [0x00000007bf180000,0x00000007bf180000,0x00000007c0000000)
+ ParOldGen       total 87040K, used 22895K [0x00000007b0000000, 0x00000007b5500000, 0x00000007bab00000)
+  object space 87040K, 26% used [0x00000007b0000000,0x00000007b165be70,0x00000007b5500000)
+ Metaspace       used 42877K, capacity 45932K, committed 46284K, reserved 1087488K
+  class space    used 6382K, capacity 7237K, committed 7372K, reserved 1048576K
+}
+Event: 1827.800 GC heap before
+{Heap before GC invocations=44 (full 6):
+ PSYoungGen      total 68608K, used 66346K [0x00000007bab00000, 0x00000007c0000000, 0x00000007c0000000)
+  eden space 58368K, 96% used [0x00000007bab00000,0x00000007be242f78,0x00000007be400000)
+  from space 10240K, 95% used [0x00000007be400000,0x00000007bed87b88,0x00000007bee00000)
+  to   space 14848K, 0% used [0x00000007bf180000,0x00000007bf180000,0x00000007c0000000)
+ ParOldGen       total 87040K, used 22895K [0x00000007b0000000, 0x00000007b5500000, 0x00000007bab00000)
+  object space 87040K, 26% used [0x00000007b0000000,0x00000007b165be70,0x00000007b5500000)
+ Metaspace       used 43007K, capacity 46080K, committed 46284K, reserved 1087488K
+  class space    used 6400K, capacity 7251K, committed 7372K, reserved 1048576K
+Event: 1827.873 GC heap after
+Heap after GC invocations=44 (full 6):
+ PSYoungGen      total 69120K, used 13074K [0x00000007bab00000, 0x00000007c0000000, 0x00000007c0000000)
+  eden space 54272K, 0% used [0x00000007bab00000,0x00000007bab00000,0x00000007be000000)
+  from space 14848K, 88% used [0x00000007bf180000,0x00000007bfe44990,0x00000007c0000000)
+  to   space 16384K, 0% used [0x00000007be000000,0x00000007be000000,0x00000007bf000000)
+ ParOldGen       total 87040K, used 25780K [0x00000007b0000000, 0x00000007b5500000, 0x00000007bab00000)
+  object space 87040K, 29% used [0x00000007b0000000,0x00000007b192d268,0x00000007b5500000)
+ Metaspace       used 43007K, capacity 46080K, committed 46284K, reserved 1087488K
+  class space    used 6400K, capacity 7251K, committed 7372K, reserved 1048576K
+}
+Event: 2760.536 GC heap before
+{Heap before GC invocations=45 (full 6):
+ PSYoungGen      total 69120K, used 67346K [0x00000007bab00000, 0x00000007c0000000, 0x00000007c0000000)
+  eden space 54272K, 100% used [0x00000007bab00000,0x00000007be000000,0x00000007be000000)
+  from space 14848K, 88% used [0x00000007bf180000,0x00000007bfe44990,0x00000007c0000000)
+  to   space 16384K, 0% used [0x00000007be000000,0x00000007be000000,0x00000007bf000000)
+ ParOldGen       total 87040K, used 25780K [0x00000007b0000000, 0x00000007b5500000, 0x00000007bab00000)
+  object space 87040K, 29% used [0x00000007b0000000,0x00000007b192d268,0x00000007b5500000)
+ Metaspace       used 43124K, capacity 46226K, committed 46540K, reserved 1089536K
+  class space    used 6403K, capacity 7254K, committed 7372K, reserved 1048576K
+Event: 2760.577 GC heap after
+Heap after GC invocations=45 (full 6):
+ PSYoungGen      total 64000K, used 11118K [0x00000007bab00000, 0x00000007bff80000, 0x00000007c0000000)
+  eden space 52736K, 0% used [0x00000007bab00000,0x00000007bab00000,0x00000007bde80000)
+  from space 11264K, 98% used [0x00000007be000000,0x00000007beadb8c8,0x00000007beb00000)
+  to   space 16896K, 0% used [0x00000007bef00000,0x00000007bef00000,0x00000007bff80000)
+ ParOldGen       total 87040K, used 25788K [0x00000007b0000000, 0x00000007b5500000, 0x00000007bab00000)
+  object space 87040K, 29% used [0x00000007b0000000,0x00000007b192f268,0x00000007b5500000)
+ Metaspace       used 43124K, capacity 46226K, committed 46540K, reserved 1089536K
+  class space    used 6403K, capacity 7254K, committed 7372K, reserved 1048576K
+}
+Event: 4081.045 GC heap before
+{Heap before GC invocations=46 (full 6):
+ PSYoungGen      total 64000K, used 63854K [0x00000007bab00000, 0x00000007bff80000, 0x00000007c0000000)
+  eden space 52736K, 100% used [0x00000007bab00000,0x00000007bde80000,0x00000007bde80000)
+  from space 11264K, 98% used [0x00000007be000000,0x00000007beadb8c8,0x00000007beb00000)
+  to   space 16896K, 0% used [0x00000007bef00000,0x00000007bef00000,0x00000007bff80000)
+ ParOldGen       total 87040K, used 25788K [0x00000007b0000000, 0x00000007b5500000, 0x00000007bab00000)
+  object space 87040K, 29% used [0x00000007b0000000,0x00000007b192f268,0x00000007b5500000)
+ Metaspace       used 43143K, capacity 46226K, committed 46540K, reserved 1089536K
+  class space    used 6403K, capacity 7254K, committed 7372K, reserved 1048576K
+Event: 4081.105 GC heap after
+Heap after GC invocations=46 (full 6):
+ PSYoungGen      total 68608K, used 10692K [0x00000007bab00000, 0x00000007bff80000, 0x00000007c0000000)
+  eden space 51712K, 0% used [0x00000007bab00000,0x00000007bab00000,0x00000007bdd80000)
+  from space 16896K, 63% used [0x00000007bef00000,0x00000007bf971168,0x00000007bff80000)
+  to   space 17408K, 0% used [0x00000007bdd80000,0x00000007bdd80000,0x00000007bee80000)
+ ParOldGen       total 87040K, used 25788K [0x00000007b0000000, 0x00000007b5500000, 0x00000007bab00000)
+  object space 87040K, 29% used [0x00000007b0000000,0x00000007b192f268,0x00000007b5500000)
+ Metaspace       used 43143K, capacity 46226K, committed 46540K, reserved 1089536K
+  class space    used 6403K, capacity 7254K, committed 7372K, reserved 1048576K
+}
+
+Deoptimization events (10 events):
+Event: 2542.441 Thread 0x00007f94608ea000 Uncommon trap: reason=unstable_if action=reinterpret pc=0x00000001138af3c0 method=javax.swing.JComponent.paintChildren(Ljava/awt/Graphics;)V @ 278
+Event: 2549.405 Thread 0x00007f94608ea000 Uncommon trap: reason=bimorphic action=maybe_recompile pc=0x0000000113af11ec method=java.awt.Component.dispatchEventImpl(Ljava/awt/AWTEvent;)V @ 242
+Event: 2549.405 Thread 0x00007f94608ea000 Uncommon trap: reason=class_check action=maybe_recompile pc=0x0000000113af0ddc method=java.awt.Component.dispatchEventImpl(Ljava/awt/AWTEvent;)V @ 229
+Event: 2549.416 Thread 0x00007f94608ea000 Uncommon trap: reason=bimorphic action=maybe_recompile pc=0x0000000113af11ec method=java.awt.Component.dispatchEventImpl(Ljava/awt/AWTEvent;)V @ 242
+Event: 2549.416 Thread 0x00007f94608ea000 Uncommon trap: reason=class_check action=maybe_recompile pc=0x0000000113af0ddc method=java.awt.Component.dispatchEventImpl(Ljava/awt/AWTEvent;)V @ 229
+Event: 2549.427 Thread 0x00007f94608ea000 Uncommon trap: reason=bimorphic action=maybe_recompile pc=0x0000000113af11ec method=java.awt.Component.dispatchEventImpl(Ljava/awt/AWTEvent;)V @ 242
+Event: 2549.427 Thread 0x00007f94608ea000 Uncommon trap: reason=class_check action=maybe_recompile pc=0x0000000113af0ddc method=java.awt.Component.dispatchEventImpl(Ljava/awt/AWTEvent;)V @ 229
+Event: 2549.443 Thread 0x00007f94608ea000 Uncommon trap: reason=bimorphic action=maybe_recompile pc=0x0000000113af11ec method=java.awt.Component.dispatchEventImpl(Ljava/awt/AWTEvent;)V @ 242
+Event: 2581.761 Thread 0x00007f945f04e800 Uncommon trap: reason=unstable_if action=reinterpret pc=0x00000001129f8fd8 method=java.io.UnixFileSystem.resolve(Ljava/lang/String;Ljava/lang/String;)Ljava/lang/String; @ 57
+Event: 3189.324 Thread 0x00007f94608ea000 Uncommon trap: reason=unstable_if action=reinterpret pc=0x00000001138c6e34 method=sun.lwawt.LWCursorManager.updateCursorImpl()V @ 21
+
+Classes redefined (0 events):
+No events
+
+Internal exceptions (10 events):
+Event: 3312.325 Thread 0x00007f9460bb4000 Exception <a 'java/net/ConnectException'> (0x00000007bb8efbe8) thrown at [/Users/java_re/workspace/8-2-build-macosx-x86_64/jdk8u191/11896/hotspot/src/share/vm/prims/jni.cpp, line 709]
+Event: 3328.329 Thread 0x00007f9460bb4000 Exception <a 'java/net/ConnectException'> (0x00000007bb8f0c20) thrown at [/Users/java_re/workspace/8-2-build-macosx-x86_64/jdk8u191/11896/hotspot/src/share/vm/prims/jni.cpp, line 709]
+Event: 3360.333 Thread 0x00007f9460bb4000 Exception <a 'java/net/ConnectException'> (0x00000007bb8f1c58) thrown at [/Users/java_re/workspace/8-2-build-macosx-x86_64/jdk8u191/11896/hotspot/src/share/vm/prims/jni.cpp, line 709]
+Event: 3424.337 Thread 0x00007f9460bb4000 Exception <a 'java/net/ConnectException'> (0x00000007bb8f2c90) thrown at [/Users/java_re/workspace/8-2-build-macosx-x86_64/jdk8u191/11896/hotspot/src/share/vm/prims/jni.cpp, line 709]
+Event: 3430.068 Thread 0x00007f945f89d000 Exception <a 'java/net/ConnectException'> (0x00000007bbde1748) thrown at [/Users/java_re/workspace/8-2-build-macosx-x86_64/jdk8u191/11896/hotspot/src/share/vm/prims/jni.cpp, line 709]
+Event: 3552.341 Thread 0x00007f9460bb4000 Exception <a 'java/net/ConnectException'> (0x00000007bb8f3cc8) thrown at [/Users/java_re/workspace/8-2-build-macosx-x86_64/jdk8u191/11896/hotspot/src/share/vm/prims/jni.cpp, line 709]
+Event: 3686.076 Thread 0x00007f945f89d000 Exception <a 'java/net/ConnectException'> (0x00000007bd4c2c70) thrown at [/Users/java_re/workspace/8-2-build-macosx-x86_64/jdk8u191/11896/hotspot/src/share/vm/prims/jni.cpp, line 709]
+Event: 3808.342 Thread 0x00007f9460bb4000 Exception <a 'java/net/ConnectException'> (0x00000007bb8f4e28) thrown at [/Users/java_re/workspace/8-2-build-macosx-x86_64/jdk8u191/11896/hotspot/src/share/vm/prims/jni.cpp, line 709]
+Event: 4081.112 Thread 0x00007f945f0e0800 Exception <a 'java/net/ConnectException'> (0x00000007bab755f0) thrown at [/Users/java_re/workspace/8-2-build-macosx-x86_64/jdk8u191/11896/hotspot/src/share/vm/prims/jni.cpp, line 709]
+Event: 4081.112 Thread 0x00007f9460bb4000 Exception <a 'java/net/ConnectException'> (0x00000007bab79c78) thrown at [/Users/java_re/workspace/8-2-build-macosx-x86_64/jdk8u191/11896/hotspot/src/share/vm/prims/jni.cpp, line 709]
+
+Events (10 events):
+Event: 4081.105 Executing VM operation: ParallelGCFailedAllocation done
+Event: 4081.108 Executing VM operation: BulkRevokeBias
+Event: 4081.110 Executing VM operation: BulkRevokeBias done
+Event: 4081.113 Executing VM operation: RevokeBias
+Event: 4081.114 Executing VM operation: RevokeBias done
+Event: 4081.114 Thread 0x00007f94607cf000 Thread exited: 0x00007f94607cf000
+Event: 4081.129 Thread 0x00007f9460802000 flushing nmethod 0x000000011357e150
+Event: 4081.130 Thread 0x00007f9460802000 flushing nmethod 0x00000001135a1dd0
+Event: 4081.133 Thread 0x00007f9460802000 flushing nmethod 0x00000001135b8150
+Event: 4081.134 Thread 0x00007f9460802000 flushing nmethod 0x00000001135d8a50
+
+
+Dynamic libraries:
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+
+VM Arguments:
+jvm_args: -Djdk.home=/Library/Java/JavaVirtualMachines/jdk1.8.0_191.jdk/Contents/Home -Dnetbeans.default_userdir_root=/Users/dmagda/Library/Application Support/VisualVM -Dnetbeans.dirs=/Library/Java/JavaVirtualMachines/jdk1.8.0_191.jdk/Contents/Home/lib/visualvm/visualvm:/Library/Java/JavaVirtualMachines/jdk1.8.0_191.jdk/Contents/Home/lib/visualvm/profiler: -Dnetbeans.home=/Library/Java/JavaVirtualMachines/jdk1.8.0_191.jdk/Contents/Home/lib/visualvm/platform -Xms24m -Xmx256m -Dsun.jvmstat.perdata.syncWaitMs=10000 -Dsun.java2d.noddraw=true -Dsun.java2d.d3d=false -Dnetbeans.keyring.no.master=true -Dplugin.manager.install.global=false --add-exports=java.desktop/sun.awt=ALL-UNNAMED --add-exports=jdk.jvmstat/sun.jvmstat.monitor.event=ALL-UNNAMED --add-exports=jdk.jvmstat/sun.jvmstat.monitor=ALL-UNNAMED --add-exports=java.desktop/sun.swing=ALL-UNNAMED --add-exports=jdk.attach/sun.tools.attach=ALL-UNNAMED --add-modules=java.activation -XX:+IgnoreUnrecognizedVMOptions -XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath=/Users/dmagda/Library/Application Support/VisualVM/8u131/var/log/heapdump.hprof 
+java_command: org.netbeans.Main --cachedir /Users/dmagda/Library/Caches/VisualVM/8u131 --userdir /Users/dmagda/Library/Application Support/VisualVM/8u131 --branding visualvm
+java_class_path (initial): /Library/Java/JavaVirtualMachines/jdk1.8.0_191.jdk/Contents/Home/lib/visualvm/platform/lib/boot.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_191.jdk/Contents/Home/lib/visualvm/platform/lib/org-openide-modules.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_191.jdk/Contents/Home/lib/visualvm/platform/lib/org-openide-util-lookup.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_191.jdk/Contents/Home/lib/visualvm/platform/lib/org-openide-util.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_191.jdk/Contents/Home/lib/visualvm/platform/lib/locale/boot_ja.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_191.jdk/Contents/Home/lib/visualvm/platform/lib/locale/boot_zh_CN.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_191.jdk/Contents/Home/lib/visualvm/platform/lib/locale/org-openide-modules_ja.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_191.jdk/Contents/Home/lib/visualvm/platform/lib/locale/org-openide-modules_zh_CN.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_191.jdk/Contents/Home/lib/visualvm/platform/lib/locale/org-openide-util-lookup_ja.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_191.jdk/Contents/Home/lib/visualvm/platform/lib/locale/org-openide-util-lookup_zh_CN.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_191.jdk/Contents/Home/lib/visualvm/platform/lib/locale/org-openide-util_ja.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_191.jdk/Contents/Home/lib/visualvm/platform/lib/locale/org-openide-util_zh_CN.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_191.jdk/Contents/Home/lib/dt.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_191.jdk/Contents/Home/lib/tools.jar
+Launcher Type: SUN_STANDARD
+
+Environment Variables:
+PATH=/Users/dmagda/.rbenv/shims:PATH=/usr/local/php5/bin:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin:/opt/X11/bin:/Applications/Postgres.app/Contents/Versions/latest/bin:/usr/local/opt/go/libexec/bin:/Users/dmagda/dev/go/bin:/Users/dmagda/apache-maven-3.3.9/bin:/Users/dmagda/bin:/Applications/Postgres.app/Contents/Versions/9.6/bin/
+LD_LIBRARY_PATH=/Library/Java/JavaVirtualMachines/jdk1.8.0_191.jdk/Contents/Home/jre/lib/amd64:/Library/Java/JavaVirtualMachines/jdk1.8.0_191.jdk/Contents/Home/jre/lib/i386:
+SHELL=/bin/bash
+DISPLAY=/private/tmp/com.apple.launchd.xhUt133Dsu/org.macosforge.xquartz:0
+
+Signal Handlers:
+SIGSEGV: [libjvm.dylib+0x5b5de9], sa_mask[0]=11111111011111110111111111111111, sa_flags=SA_ONSTACK|SA_RESTART|SA_SIGINFO
+SIGBUS: [libjvm.dylib+0x5b5de9], sa_mask[0]=11111111011111110111111111111111, sa_flags=SA_RESTART|SA_SIGINFO
+SIGFPE: [libjvm.dylib+0x48b6b0], sa_mask[0]=11111111011111110111111111111111, sa_flags=SA_RESTART|SA_SIGINFO
+SIGPIPE: [libjvm.dylib+0x48b6b0], sa_mask[0]=11111111011111110111111111111111, sa_flags=SA_RESTART|SA_SIGINFO
+SIGXFSZ: [libjvm.dylib+0x48b6b0], sa_mask[0]=11111111011111110111111111111111, sa_flags=SA_RESTART|SA_SIGINFO
+SIGILL: [libjvm.dylib+0x48b6b0], sa_mask[0]=11111111011111110111111111111111, sa_flags=SA_RESTART|SA_SIGINFO
+SIGUSR1: SIG_DFL, sa_mask[0]=11011111011111100000000111000110, sa_flags=none
+SIGUSR2: [libjvm.dylib+0x48b1ce], sa_mask[0]=00000000000000000000000000000000, sa_flags=SA_RESTART|SA_SIGINFO
+SIGHUP: [libjvm.dylib+0x489759], sa_mask[0]=11111111011111110111111111111111, sa_flags=SA_RESTART|SA_SIGINFO
+SIGINT: SIG_IGN, sa_mask[0]=00000000000000000000000000000000, sa_flags=none
+SIGTERM: [libjvm.dylib+0x489759], sa_mask[0]=11111111011111110111111111111111, sa_flags=SA_RESTART|SA_SIGINFO
+SIGQUIT: [libjvm.dylib+0x489759], sa_mask[0]=11111111011111110111111111111111, sa_flags=SA_RESTART|SA_SIGINFO
+
+
+---------------  S Y S T E M  ---------------
+
+OS:Bsduname:Darwin 19.2.0 Darwin Kernel Version 19.2.0: Sat Nov  9 03:47:04 PST 2019; root:xnu-6153.61.1~20/RELEASE_X86_64 x86_64
+rlimit: STACK 8192k, CORE 0k, NPROC 1392, NOFILE 10240, AS infinity
+load average:2.30 3.24 5.87
+
+CPU:total 4 (initial active 4) (2 cores per cpu, 2 threads per core) family 6 model 61 stepping 4, cmov, cx8, fxsr, mmx, sse, sse2, sse3, ssse3, sse4.1, sse4.2, popcnt, avx, avx2, aes, clmul, erms, 3dnowpref, lzcnt, ht, tsc, tscinvbit, bmi1, bmi2, adx
+
+Memory: 4k page, physical 8388608k(35724k free)
+
+/proc/meminfo:
+
+
+vm_info: Java HotSpot(TM) 64-Bit Server VM (25.191-b12) for bsd-amd64 JRE (1.8.0_191-b12), built on Oct  6 2018 08:37:07 by "java_re" with gcc 4.2.1 (Based on Apple Inc. build 5658) (LLVM build 2336.11.00)
+
+time: Wed Apr  8 13:59:10 2020
+elapsed time: 4081 seconds (0d 1h 8m 1s)
+
diff --git a/includes/header.html b/includes/header.html
index 03a395e..75ed899 100644
--- a/includes/header.html
+++ b/includes/header.html
@@ -3,8 +3,8 @@
 <header id="header" class="affix header sticky-top shrink" data-spy="affix" data-offset-top="0">
     <div id="promotion-bar">
         <p>
-            Tech Talk, July 28th: <a href="https://www.meetup.com/Apache-Ignite-Virtual-Meetup/events/271602652/" rel="noopener" target="_blank">
-            Apache Ignite Best Practices for Native Persistence and Data Recovery</a>
+            Tech Talk, August 11th: <a href="https://www.meetup.com/Apache-Ignite-Virtual-Meetup/events/271602652/" rel="noopener" target="_blank">
+            Designing Serverless Blockchain Network With Apache Ignite</a>
         </p>
     </div>