John Darret Steward created WAVE-393:
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Summary: Delta File Storage Crashes WIAB
Key: WAVE-393
URL: https://issues.apache.org/jira/browse/WAVE-393
Project: Wave
Issue Type: Bug
Components: Server
Reporter: John Darret Steward
Priority: Critical
I've been trying to run a WIAB server using delta_store_type = file so as to
persist waves on the filesystem. However, this causes the following error to be
thrown whenever a wave is subject to active, heavy concurrent edition by at
least two users:
com.google.gxp.compiler.io.RuntimeIOException: java.io.IOException: Delta
header invalid
at
org.waveprotocol.box.server.waveserver.DeltaStoreBasedWaveletState.getTransformedDeltaHistory(DeltaStoreBasedWaveletState.java:374)
at
org.waveprotocol.box.server.waveserver.WaveletContainerImpl.transformSubmittedDelta(WaveletContainerImpl.java:374)
at
org.waveprotocol.box.server.waveserver.WaveletContainerImpl.maybeTransformSubmittedDelta(WaveletContainerImpl.java:359)
at
org.waveprotocol.box.server.waveserver.LocalWaveletContainerImpl.transformAndApplyLocalDelta(LocalWaveletContainerImpl.java:140)
at
org.waveprotocol.box.server.waveserver.LocalWaveletContainerImpl.submitRequest(LocalWaveletContainerImpl.java:98)
at
org.waveprotocol.box.server.waveserver.WaveServerImpl.submitDelta(WaveServerImpl.java:553)
at
org.waveprotocol.box.server.waveserver.WaveServerImpl.submitRequest(WaveServerImpl.java:355)
at
org.waveprotocol.box.server.frontend.ClientFrontendImpl.submitRequest(ClientFrontendImpl.java:194)
at
org.waveprotocol.box.server.frontend.WaveClientRpcImpl.submit(WaveClientRpcImpl.java:166)
at
org.waveprotocol.box.common.comms.WaveClientRpc$ProtocolWaveClientRpc$1.submit(WaveClientRpc.java:4478)
at
org.waveprotocol.box.common.comms.WaveClientRpc$ProtocolWaveClientRpc.callMethod(WaveClientRpc.java:4608)
at
org.waveprotocol.box.server.rpc.ServerRpcControllerImpl.run(ServerRpcControllerImpl.java:202)
at
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:895)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918)
at java.lang.Thread.run(Thread.java:680)
Caused by: java.io.IOException: Delta header invalid
at
org.waveprotocol.box.server.persistence.file.FileDeltaCollection.readDeltaHeader(FileDeltaCollection.java:451)
at
org.waveprotocol.box.server.persistence.file.FileDeltaCollection.readRecord(FileDeltaCollection.java:406)
at
org.waveprotocol.box.server.persistence.file.FileDeltaCollection.getDelta(FileDeltaCollection.java:189)
at
org.waveprotocol.box.server.waveserver.DeltaStoreBasedWaveletState.getDelta(DeltaStoreBasedWaveletState.java:169)
at
org.waveprotocol.box.server.waveserver.DeltaStoreBasedWaveletState.readDeltasInRange(DeltaStoreBasedWaveletState.java:147)
at
org.waveprotocol.box.server.waveserver.DeltaStoreBasedWaveletState.getTransformedDeltaHistory(DeltaStoreBasedWaveletState.java:366)
... 14 more
After a while trying to debug this I found it originates because, at some
point, the server will try to read a past version of the wave from the
persistence file using an erroneous or corrupted position in the file as an
index. This occurs almost "randomly" halfway through the editing process, and
can be easily reproduced by having two users opening and editing the same wave
actively using the WIAB client.
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